A first report of decapod crustaceans (Anomura and Brachyura) from Laje de Santos: a no-take marine reserve in the southeast coast of Brazil

Primer reporte de crustáceos decápodos (Anomura y Brachyura) de Laje de Santos: una reserva marina protegida en la costa sureste de Brasil

“No-take” Marine reserves (NTM) are areas completely protected from all extractive and destructive activities (Lubchenco et al., 2003). The importance of the maintenance and creation of new NTMs has been highlighted in a way to improve the preservation of the marine biodiversity and the commercial stocks (Lester et al., 2009; Rolim et al., 2019). The Marine State Park of Laje de Santos (MSPLS) is the first NTM on the southeastern Brazilian coast due to its unique peculiar island area and fauna (State Decree No. 37,537 from September 27, 1993). 

The MSPLS is an area with more than 5,000 ha formed by the complex of “isolated” upright rock in the continental platform, positioned about 36 km from the São Paulo coast and the Santos city, with no close islands around it. Despite the pristine condition proportioned partially by the difficulty of access (expected by recreational SCUBA diving activities), indirect anthropogenic impacts (e.g., climate change and biological invasions through ballast water) may affect biodiversity of this region. The park is located close to the most important and biggest Brazilian harbor, which moves more than 1,000 tons of materials in daily shipments. Such region is at imminent risk of introducing non-native species through ballast water in ships traveling long distances (D’incao, 1995; Drehen-Mansur et al., 2003; Negreiros-Fransozo, 1996; Tavares & Amouroux, 2003). Despite its importance as a biodiversity conservation area, only a few biological studies have been conducted at the park area, and the record of crustacean fauna is completely non-existent (Luiz et al., 2008), expect for a recent study on the caridean shrimp fauna composition (Moraes et al., 2021).

Decapod crustaceans are one of the most representative groups in species diversity and trophic dynamics in marine environments. In different substrates, such as coral, rocky subtidal, and intertidal zones they are especially abundant (Abele, 1974; Alves et al., 2011; Coelho et al., 2008; Randall, 1967; Terossi et al., 2018). The knowledge of decapod biodiversity along the southeastern Brazilian coast has been increased in the past years (Mantelatto et al., 2018). Some shallow-water groups were targeted and studied with some degree of information, especially in the north area of São Paulo State (Almeida et al., 2018; Fransozo et al., 2002; Mantelatto & Fransozo, 2000; Terossi et al., 2018); however, the detailed information of this group inhabiting island-like regions is poorly known and limited (Almeida et al., 2013; Alves, Barros-Alves, Cobo et al., 2012; Coelho et al., 2008; Giraldes, Coelho-Filho, & Coelho, 2015; Mantelatto & Garcia, 2002; Mantelatto, Faria et al., 2004; Mantelatto, Biagi et al., 2004). 

Management plans need constant monitoring and evaluation, and these processes can only be genuinely completed when there is information on local fauna. The no-take marine reserves are one of the most effective types of Marine Protected areas and deserve especial attention to their associated biota from small invertebrates to vertebrates to make an effective plan to protect all of them (Sala & Giakoumi, 2018). In this work, we provide the first records for Anomura and Brachyura crustaceans for the MSPLS. These results can be used as baseline information in the local conservation plan.

For comparative purposes, the Shannon-Wiener diversity index (H’) was also employed. This index relies on relative abundance of sampled species and works as comparative measure (Gotelli & Ellison, 2004; Stirling & Wilsey, 2001). This index will provide a diversity value which can be used to compare with other regions, island and NTMs to evaluate the state of the local diversity. Also, this index can provide comparative and baseline data for future studies on MPSLS and management plans which will be able to evaluate if the diversity decreased or increased revealing the potential efficiency of the management plan. 

Materials and methods 

Sampling was conducted on the rocky subtidal zone of Laje de Santos (24º19’13” S, 46º10’49” W) between June/2015 and July/2016, under license permission COTEC No. 91/2015 D187/2014 BA, PROCESS SMA No. 260108-010.480/2014. We performed 4 one-day expeditions (daylight period) in intervals of 3 months. We used 2 combined different methodologies to capture the specimens: 1) the active search performed by 2 SCUBA divers during 2 hours in each campaign, and 2) the passive capture using 5 Artificial Refuge Substrates (ARS) (see Alves et al. [2019] and Moraes et al. [2021] for details about the ARS). The ARSs were left in the environment: above rocks, in crevices, and between coral and anemone groups during the intervals of 3 months to be colonized by the fauna, especially decapod crustaceans. At each sampling campaign, ARSs were bagged and thoroughly searched to find associated Brachyura and Anomura, and then, 5 new ARSs were installed for another 3-month period until the one-year sample was complete. A total of 20 ARSs were analyzed. The active search and installation of the ARSs was performed randomly along 200 m in the consolidated sublittoral of MSPLS until a 20 m depth (Figs. 1, 2). 

All specimens sampled were individualized and frozen or kept alive to preserve the color and morphology, and were transported to the Laboratory of Carcinology, Institute of Biosciences of Botucatu for further analysis. Individuals were identified using specialized taxonomical keys (Ferreira & Melo, 2016; McLaughlin, 2003; Melo, 1996, 1999; Nucci & Melo, 2007, 2011, 2015). Since there was no morphological variation novelty in all specimens analyzed, all diagnosis used to identify and confirm the taxonomic status were based on specialized literature, which is properly cited in the taxonomic account. For the Anomura and taxa above infraorder level, we follow the classification proposed by Ahyong et al. (2011), and for the Brachyura the classification proposed by Ng et al. (2008). To assess the sex in the Anomura, we used the position of the gonopore, which in males is at the base of the thigh of the fifth pair of pereopods, and in females is at the base of the thigh of the third pair of pereopods (Melo, 1999). For Brachyura, the sex was determined by the shape of the pleon (a thin shape for males and an oval shape for females) and the number of pleopods (2 pairs for males and 4 pairs for females). The specimens were grouped according to sex and developmental stages as: adult male (M), adult female (F), ovigerous female (OF), and juvenile (J). The cephalothoracic shield length (SL) was measured for the Anomura (hermit crabs only), and the carapace width (CW) for porcelanid crabs and the Brachyura, always using a stereomicroscope (Zeiss Stemi SV6 with a Zeiss Stemi 2000-C image capture system) and the Axio Visio software (vers.4.8). 

The Shannon diversity index (H) was calculated for the sampling methods: active search, ARS, and combined methods (active search + ARS). Rarefaction curves were also performed to compare the sampling methods. The analyses were carried out using the iNEXT package (Hsieh et al., 2016) in R (R-Core Team, 2020).

After analyzes, the specimens were deposited in the Crustacean Collection of the Department of Biology (CCDB) of FFCLRP, University of São Paulo, Ribeirão Preto, Brazil (CCDB/FFCLRP/USP – Authorization No. 071/2012/SECEX/CGEN). 

Results

Subphylum Crustacea Brünnich, 1772

Class Malacostraca Latreille, 1802

Subclass Eumalacostraca Grobben, 1892

Superorder Eucarida Calman, 1904

Order Decapoda Latreille, 1802

Suborder Pleocyemata Burkenroad, 1963

Infraorder Anomura MacLeay, 1838

A total of 158 specimens of Anomura were sampled, representing 7 species, 6 genera, and 3 families. The Diogenidae was the most representative anomuran family, with 3 species recorded (Table 1).

Superfamily Galatheoidea Samouelle, 1819

Family Porcellanidae Haworth, 1825

Pachycheles monilifer (Dana, 1852) 

(Fig. 3A)

Diagnosis and morphological description: Melo (1999), and Ferreira & Melo (2016).

Taxonomic summary

Type locality. Rio de Janeiro, Brazil (as Porcellana monilifera) (Dana, 1852). 

Geographic distribution. Western Atlantic – Gulf of Mexico, North coast of South America, and Brazil (from Pará to Santa Catarina). Eastern Pacific: Ecuador and Peru (Ferreira & Melo, 2016).

Material examined. 1 M, size: 7.75 mm CW; 1 OF, size: 7.78 mm CW. CCDB 6517.

Petrolisthes amoenus (Guérin-Méneville, 1855) 

(Fig. 3B)

Diagnosis and morphological description: Melo (1999); updated morphological remarks: Ferreira & Melo (2016); morphological and coloration comments: Ferreira & Tavares (2017).

 

Table 1

List of studied species and number of specimens collected from the Marine State Park of Laje de Santos, Brazil organized according to taxonomical groups and sampling methodology: ARS = passive capture by the Artificial Refuge Substrate and Active search by SCUBA dive performance.

Infraorder	Superfamily	Family	Subfamily	Species	ARS	Active search
Anomura	Galatheoidea	Porcellanidae		Pachycheles monilifer	0	2
				Petrolisthes amoenus	0	1
	Paguroidea	Diogenidae		Calcinus tibicen	0	1
				Dardanus venosus	0	2
				Paguristes tortugae	13	2
		Paguridae		Pagurus brevidactylus	106	14
				Pagurus criniticornis	17	0
Brachyura	Eriphioidea	Menippidae		Menippe nodifrons	2	1
	Majoidea	Epialtidae		Stenocionops furcatus	1	0
		Inachoididae	Stenorhynchinae	Stenorhynchus seticornis	42	2
		Mithracidae		Mithraculus forceps	381	160
				Mithraculus sculptus	0	1
				Mithrax hispidus	0	1
				Mithrax tortugae	1	2
				Pitho lherminieri	0	2
	Pilumnoidea	Pilumnidae	Pilumninae	Pilumnus caribaeus	4	0
				Pilumnus reticulatus	8	0
	Portunoidea	Portunidae	Thalamitinae	Cronius ruber	0	1
	Xanthoidea	Panopeidae		Acantholobulus bermudensis	18	26
				Acantholobulus schmitti	0	1
				Hexapanopeus angustifrons	1	1
				Hexapanopeus caribbaeus	3	0
				Panopeus austrobesus	0	1
				Panopeus harttii	2	0
				Panopeus rugosus	12	5
		Pseudorhombilidae		Micropanope sculptipes	2	0
				Scopolius nuttingi	22	0
		Xanthidae		Cataleptodius floridanus	1	0
				Melybia thalamita	77	24
				Xanthodius parvulus	19	0
				Williamstimpsonia denticulatus	0	3
			Zosiminae	Platypodiella spectabilis	0	2

 

Taxonomic summary

Type locality. Cuba (as Porcellana amoena) (Guérin-Méneville, 1855). 

Geographic distribution. Western Atlantic – USA, Florida, Mexico: Yucatán, Cuba, Puerto Rico, Barbados, Colombia, Providence and Santa Marta Islands, Curacao and Bonaire, Venezuela, Los Roques, Cubagua and Gran Roque islands, Trinidad and Tobago, and Brazil (Fernando de Noronha and Trindade Islands, and from Maranhão to São Paulo) (Alves et al., 2006; Ferreira & Melo, 2016; Tavares et al., 2017).

Material examined. 1 OF, Size: 6.87 mm CW; CCDB 6518.

Remarks

This is the southernmost record for P. amoenus since the previous distribution was limited to the northern region of the São Paulo state (Alves et al., 2006).

Superfamily Paguroidea Latreille, 1802

Family Diogenidae Ortmann, 1892

Calcinus tibicen (Herbst, 1791) 

(Fig. 3C)

Diagnosis and morphological description: Melo (1999); updated morphological remarks: Nucci and Melo (2015); coloration comments: Mandai et al. (2018). 

Taxonomic summary

Type locality. Locality not given by the authors.

Geographic distribution. Western Atlantic – Bermudas Florida, Gulf of Mexico, Antilles, Panama, Colombia, Venezuela, and Brazil (Fernando de Noronha, Martim Vaz & Trindade archipelago, and from Ceará to Santa Catarina) (Lima et al., 2019; Nucci & Melo, 2015; Tavares et al., 2017).

Material examined. 1 OF; size: 3.71 mm SL; 

Remarks

The genus Calcinus is fairly distributed in the Indo-Pacific region, but in the Western-Atlantic there are only 3 species recorded with only C. tibicen occurring in Brazilian waters (Nucci & Melo, 2015). Thus, being common and widely distributed in the Brazilian coast, the only specimen sampled was allocated for other purposes in our laboratory. 

Dardanus venosus (H. Milne Edwards, 1848) 

(Fig. 3D)

Diagnosis and morphological description: Biffar and Provenzano (1972); updated morphological remarks: Melo (1999), Nucci and Melo (2015). 

Taxonomic summary

Type locality. Guadeloupe (as Pagurus venosus) (Milne Edwards, 1848).

Geographic distribution. Western Atlantic – Bermudas, Florida, Gulf of Mexico, Antilles, Colombia, and Brazil (Atol das Rocas, Fernando de Noronha, Martim Vaz & Trindade archipelago, and from Pará to São Paulo) (Lima et al., 2019; Nucci & Melo, 2007).

Material examined. 2 M, size range: 6.13 ≤ SL ≤ 7.37 mm; CCDB 6519.

Remarks

This is the southernmost record for D. venosus since the previous distribution was limited to the northern region of the São Paulo state (Mantelatto et al., 2001).

Paguristes tortugae Schmitt, 1933 

(Fig. 4A)

Diagnosis and morphological description: McLaughlin and Provenzano (1974) and Melo (1999); morphological comments of Paguristes complex and key for the western Atlantic species of the complex: Lima and Santana (2017).

Taxonomic summary

Type locality. Garden Key, Dry Tortugas, Florida (Schmitt, 1933).

Geographic distribution. Western Atlantic – North Carolina, Florida, Gulf of Mexico, Antilles, Suriname, Guianas, and Brazil (from Amapá to Santa Catarina) (Nucci, 2002).

Material examined. 9 M, size range: 0.77 ≤ SL ≤ 4.87 mm; 6 F, size range: 1.72 ≤ SL ≤ 4.93 mm. CCDB 6520.

Family Paguridae Latreille, 1802

Pagurus brevidactylus (Stimpson, 1859) 

(Fig. 4B)

Diagnosis and morphological description: Melo (1999); updated morphological remarks: Nucci and Melo (2007). 

Taxonomic summary

Type locality. Locality not given by Stimpson (1859).

Geographic distribution. Western Atlantic – the Bermudas, Gulf of Mexico, Antilles, Central America, North of South America, and Brazil (Fernando de Noronha, and from Pernambuco to Santa Catarina) (Nucci & Melo, 2007).

Material examined. 54 M, size range: 0.86 ≤ SL ≤ 2.56 mm; 18 F, size range: 0.72 ≤ SL ≤ 2.60 mm; 34 OF, size range: 1.36 ≤ SL ≤ 2.18 mm; 14 J, size range: 0.4 ≤ SL ≤ 1.30 mm. CCDB 6521.

Pagurus criniticornis (Dana, 1852) 

(Fig. 4C)

Diagnosis and morphological description: Melo (1999); updated morphological remarks: Nucci and Melo (2007). 

Taxonomic summary

Type locality. Locality not given by Dana (1852).

Geographic distribution. Western Atlantic – Gulf of Mexico, Antilles, northern South America, Brazil (São Pedro Archipelago and São Paulo, and from Pernambuco to Rio Grande do Sul), Uruguay, and Argentina (Nucci & Melo, 2007).

Material examined. 11 M, size range: 0.86 ≤ SL ≤ 1.79 mm; 1 F, size: 1.38 mm SL; 5 OF, size range: 1.26 ≤ SL ≤ 1.80 mm. 

Remarks

This species is very common in the Western Atlantic and in Brazilian waters (Melo, 1999; Nucci & Melo, 2007), thus the specimens sampled were directed for other purposes of the laboratory.

Infraorder Brachyura Linnaeus, 1758

A total of 829 individuals of Brachyura belonging to 25 species, 16 genera, and 8 families (Mithracidae, Epialtidae, Inachoididae, Pilumnidae, Portunidae, Xanthidae, Panopeidae, and Menippidae) were collected. The Panopeidae was the most representative family, with 7 species sampled. The most representative species was Mithraculus forceps A. Milne-Edwards, 1875, with a total of 541 specimens.

Section Eubrachyura de Saint Laurent, 1980

Subsection Heterotremata Guinot, 1977

Superfamily Eriphioidea MacLeay, 1838

Family Menippidae Ortmann, 1893

Menippe nodifrons Stimpson, 1859 

(Fig. 5A)

Diagnosis and morphological description: Melo (1996).

Taxonomic summary

Type locality. Indian River, Florida (Stimpson, 1859).

Geographic distribution. Western Atlantic – Florida, Gulf of Mexico, Central America, Antilles, northern South America, and Brazil (from Maranhão to Santa Catarina). Eastern Atlantic – From Cape Verde islands to Angola (Alves, Barros-Alves, Cobo et al., 2012; Coelho et al., 2008; Giraldes, Coelho-Filho, & Coelho, 2015; Mantelatto et al., 2020; Melo, 1998, 2008; Pachelle et al., 2016).

Material examined. 2 M, size range: 10.19 ≤ CW ≤ 32.81 mm; 1 F, size: 7.99 mm CW. CCDB 6522.

Superfamily Majoidea Samouelle, 1819

Family Epialtidae MacLeay, 1838

Stenocionops furcatus (Oliver, 1791) 

(Fig. 5B)

Diagnosis and morphological description: Melo (1996); updated morphological remarks: Colavite et al. (2016).

Taxonomic summary

Type locality. Locality not given by the authors. 

Geographic distribution. Western Atlantic – Georgia, Florida, Gulf of Mexico, West Indies, Colombia, and Brazil (from Ceará to the Rio Grande do Sul) (Coelho et al., 2008; Colavite et al., 2016; Melo, 1996).

Material examined. 1 M; size: 4.20 mm CW; CCDB 6523.

Family Inachoididae Dana, 1851

Subfamily Stenorhynchinae Dana, 1851

Stenorhynchus seticornis (Herbst, 1788)

Diagnosis and morphological description: Melo (1996); details on taxonomic status of the family Inachoididae, and interpretations of S. seticornis morphology: Guinot (2012). 

Taxonomic summary

Type locality. Uncertain, perhaps Guadeloupe, discussed at Rathbun (1925).

Geographic distribution. Western Atlantic – Bermuda, North Carolina, Florida, Gulf of Mexico, Antilles, Colombia, Venezuela, Guyanas, Brazil (from Amapá to Rio Grande do Sul) Uruguay, and Argentina (Alves, Barros-Alves, Cobo et al., 2012; Coelho-Filho, 2006; Guinot, 2012; Mantelatto, 2020 …en las referencias solo hay: Mantelatto et al., 2020, se refieren a esta cita??; Melo, 1998, 2008).

Material examined. 11 M, size range: 2.48 ≤ CW ≤ 12.72 mm; 23 F, size range: 3.7 ≤ CW ≤ 11.94 mm; 10 OF, size range: 6.73 ≤ CW ≤ 10.41 mm; CCDB 6524.

Family Mithracidae MacLeay, 1838

Mithraculus forceps A. Milne-Edwards, 1875 (in A. Milne-Edwards, 1873-1880)

(Fig. 5C)

Diagnosis and morphological description: Melo (1996); details on taxonomic status of the family Mithracidae, and interpretations of M. forceps morphology: Windsor and Felder (2014); integrative interpretation for taxonomic discussion of the species: Assugeni et al. (2017). 

Taxonomic summary

Type locality. Guyana (Milne-Edwards, 1873-1881).

Geographic distribution. Western Atlantic – From North Carolina to the south of Florida, West Indies, Gulf of Mexico, Antilles, Venezuela, and Brazil (Fernando de Noronha and Atol das Rocas, and from Maranhão to Santa Catarina) (Alves, Barros-Alves, Cobo et al., 2012; Coelho et al., 2008; Coelho-Filho, 2006; Mantelatto et al., 2020; Melo, 1998; Rieger & Giraldi 1996; Tavares et al., 2017). 

Material examined. 211 M, size range: 2.86 ≤ CW ≤ 18.47mm; 143 F, size range: 3.18 ≤ CW ≤ 15.49mm; 46 OF, size range: 8.34 ≤ CW ≤ 16.01mm; 141 J, size range: 3.01 ≤ CW ≤ 8.24mm; CCDB 6525.

Mithraculus sculptus (Lamarck, 1818) 

Diagnosis and morphological description: Melo (1996); details on taxonomic status of the family Mithracidae, and interpretations of M. sculptus morphology: Windsor and Felder (2014); integrative interpretation for taxonomic discussion of the species: Assugeni et al. (2017). 

Taxonomic summary

Type locality. Locality not given by the authors. 

Geographic distribution. Western Atlantic – Florida, Gulf of Mexico, Antilles, and Brazil (Fernando de Noronha, from Rio Grande do Norte to São Paulo) (Alves, Barros-Alves, Cobo et al., 2012; Alves, Barros-Alves, Teixeira et al., 2012; Camargo et al., 2010; Mantelatto et al., 2020; Melo, 1998).

Material examined. 1 J; Size: 11.97 mm CW; CCDB 6526.

Mithrax hispidus (Herbst, 1790) 

Diagnosis and morphological description: Melo (1996); details on taxonomic status of the family Mithracidae, and interpretations of M. hispidus morphology: Windsor and Felder (2014) (as Damithrax hispidus), correcting the Mithrax genera at Windsor and Felder (2017), integrative interpretation for taxonomic discussion of the species: Assugeni et al. (2017) (as M. hispidus ); morphological information about larval stages of the species: Santana et al. (2003).

Taxonomic summary

Type locality. Locality not given by the authors. 

Geographic distribution. Western Atlantic – Delaware, southern Florida, Gulf of Mexico, Antilles, Colombia, and Brazil (Amapá, Pernambuco, and from São Paulo to Santa Catarina) (Almeida et al., 2008; Alves, Barros-Alves, Cobo et al., 2012; Alves, Barros-Alves, Teixeira et al., 2012; Giraldes, Coelho-Filho, & Smyth, 2015; Mantelatto et al., 2020).

Material examined. 1 F; size: 42.4 mm CW; CCDB 6527.

Mithrax tortugae Rathbun, 1920 

(Fig. 5D)

Diagnosis and morphological description: Melo (1996), details on taxonomic status of the family Mithracidae, and interpretations of M. tortugae morphology: Windsor and Felder (2014) (as Damithrax tortugae), correcting for the Mithrax genera at Windsor and Felder (2017); integrative interpretation for taxonomic discussion of the species: Assugeni et al. (2017) (as M. tortugae). 

Taxonomic summary

Type locality. Tortuga, Florida (Rathbun, 1920).

Geographic distribution. Western Atlantic – North Carolina to Florida, Gulf of Mexico, West Indies, Colombia, Venezuela, and Brazil (Pará, Pernambuco, Alagoas, Bahia, São Paulo, Santa Catarina) (Alves, Barros-Alves, Cobo et al., 2012; Cobo & Alves, 2009; Coelho et al., 2008; Mantelatto, Faria et al., 2004; Mantelatto et al.,2020; Melo, 1998; Rieger & Giraldi, 2001).

Material examined. 2 M size range: 14.36 ≤ CW ≤ 38.4 mm; 1 F, size: 32.2 mm CW; CCDB 6528.

Pitho lherminieri (Desbonne, in Desbonne & Schramm, 1867) 

(Fig. 6A)

Diagnosis and morphological description: Melo (1996); details on taxonomic status of the family Mithracidae, and interpretations of P. lherminieri morphology: Windsor and Felder (2014). 

Taxonomic summary

Type locality. Guadeloupe (Desbonne & Schram, 1867).

Geographic distribution. Western Atlantic – from North Carolina to Florida, Gulf of Mexico, Antilles, West Indies, south coast of Cuba, and Brazil (Fernando de Noronha, and from Pará to São Paulo) (Almeida & Coelho, 2008; Almeida et al., 2008; Alves, Barros-Alves, Cobo et al., 2012; Coelho-Filho, 2006; Diez-García & Capote, 2015; Giraldes, Coelho-Filho, & Smyth, 2015; Mantelatto et al., 2020; Melo, 2008).

Material examined. 1M, size: 8.56 mm CW; 1F, size: 10.97 mm CW; CCDB 6529. 

Superfamily Pilumnoidea Smouelle, 1819

Family Pilumnidae Samouelle, 1819

Subfamily Pilumninae Samouelle, 1819

Pilumnus caribaeus Desbonne, in Desbonne & Schramm, 1867 

(Fig. 6B)

Diagnosis and morphological description: Melo (1996); taxonomic comments for P. caribaeus species: Abele and Kim (1986). 

Taxonomic summary

Type locality. Guadeloupe (Desbonne & Schram, 1867).

Geographic distribution. Western Atlantic – Florida Keys, West Indies, northern South America, and Brazil (from Pará to Santa Catarina; some occurrences in northern and northeastern Brazil, as P. brasiliensis) (Coelho & Ramos-Porto, 1980; Mantelatto et al., 2020; Melo, 1996; Miers, 1886; Powers, 1977).

Material examined. 2 M, size range: 9.9 ≤ CW ≤ 18.62 mm; 1 F, size: 15.58 mm CW; 1 J, size: 7.46 mm CW; CCDB 6544.

Pilumnus reticulatus Stimpson, 1860 

(Fig. 6C)

Diagnosis and morphological description: Melo (1996); taxonomic comments for P. reticulatus species: Rathbun (1930).

Taxonomic summary

Type locality. St. Thomas, USA (Stimpson, 1860).

Geographic distribution. Western Atlantic – Central America, West Indies, and South America, and Brazil (from Pará to Rio Grande do Sul), and Argentina (Alves, Barros-Alves, Cobo et al., 2012; Bertini et al., 2010; Coelho et al., 2008; Hendrickx, 1995; Mantelatto et al., 2020; Melo, 2008). 

Material examined. 5 M, size range: 3.23 ≤ CW ≤ 7.05 mm; 2 F, size range: 7.23 ≤ CW ≤ 8.09 mm; 1 OV, size: 7.01 mm CW; CCDB 6545.

Superfamily Portunoidea Rafinesque, 1815

Family Portunidae Rafinesque, 1815

Subfamily Thalhamitinae Paul’son, 1875

Cronius ruber (Lamarck, 1818) 

(Fig. 6D)

Diagnosis and morphological description: Melo (1996); details on taxonomic status of the family Portunidae, and interpretations of Thalhamitinae and C. ruber morphology: Spiridonov et al. (2014).

Taxonomic summary

Type locality. Mazatlán, Mexico (as Amphitrite Edwardsii) (Lockington, 1877).

Geographic distribution. Western Atlantic – from Virginia and North Carolina to Florida, Gulf of Mexico, Central America, Antilles, Guiana, and Brazil (from Amapá to Rio Grande do Sul). Eastern Atlantic – from Mauritania to Angola, Cape Verde, Principe, São Tomé, and Annobon islands. Eastern Pacific – from Baja California to Peru and Galapagos islands (Alves, Barros-Alves, Cobo et al., 2012; Mantelatto et al., 2009, 2020; Melo, 2008). 

Material examined. 1 F; Size: 38.66 mm CW; CCDB 6546.

Superfamily Xanthoidea MacLeay, 1838

Family Panopeidae Ortmann, 1893

Acantholobulus bermudensis (Benedict & Rathbun, 1891)

Diagnosis and morphological description: Melo (1996) (as Panopeus bermudensis); details on taxonomic status of the genus Acantholobulus, and interpretations of A. bermudensis morphology: Felder and Martin (2003). 

Taxonomic summary

Type locality. Bermudas (as Panopeus bermudensis) (Benedict & Rathbun, 1891).

Geographic distribution. Western Atlantic – Florida, Gulf of Mexico, Antilles, northern South America, West Indies, and Brazil (Ceará, São Paulo to Santa Catarina) (Barros-Alves et al., 2018; Coelho et al., 2008; Mantelatto et al., 2020; Melo, 2008).

Material examined. 24 M, size range: 3.35 ≤ CW ≤ 13.44 mm; 14 F, size range: 5.59 ≤ CW ≤ 11.74 mm; 4 OF, size range: 7.54 ≤ CW ≤ 7.83 mm; 2 J, size range: 4.6 ≤ CW ≤ 6.27 mm; CCDB 6530.

Acantholobulus schmitti (Rathbun, 1930)

Diagnosis and morphological description: Melo (1996) (as Hexapanopeus schmitti); details on taxonomic status of the genus Acantholobulus, and interpretations of A. schmitti morphology: Felder and Martin (2003). 

Taxonomic summary

Type locality. Bay of Rio de Janeiro, Brazil (as Hexapanopeus schmitti) (Rathbun, 1930).

Geographic distribution. Western Atlantic – Brazil (from Ceará to Santa Catarina), Uruguay, and Argentina (Alves, Barros-Alves, Cobo et al., 2012; Boschi et al. 1992; Coelho et al., 2008; Mantelatto et al., 2020; Melo, 1998, 2008).

Material examined. 1 OF; size: 7.43 mm CW; CCDB 6531.

Hexapanopeus angustifrons (Benedict & Rathbun, 1891) 

(Fig. 7A)

Diagnosis and morphological description: Melo (1996); taxonomic comments for H. angustifrons species: Abele and Kim (1986). 

Taxonomic summary

Type locality. Long Island Sound (as Panopeus angustifrons) (Rathbun, 1930).

Geographic distribution. Western Atlantic – from Massachusetts to South Carolina, Florida, Gulf of Mexico, West Indies Antilles, and Brazil (from Pernambuco to Rio Grande do Sul) (Almeida & Coelho, 2008; Almeida et al., 2008; Alves, Barros-Alves, Cobo et al., 2012; Coelho et al., 2008; Mantelatto et al., 2020; Melo, 1996; Vieira & Calazans, 2010).

Material examined. 2 M; size range: 6.33 ≤ CW ≤ 17.89 mm; CCDB 6532.

Hexapanopeus caribbaeus (Stimpson, 1871)

Diagnosis and morphological description: Melo (1996); taxonomic comments for Hexapanopeus genus and H. caribbaeus species: Sankarankutty and Ferreira (2000). 

Taxonomic summary

Type locality. St. Thomas (as Micropanope caribbaeus) (Stimpson, 1871a).

Geographic distribution. Western Atlantic – the Antilles, northeastern of South America, Jamaica, Puerto Rico, Colombia, Trinidad, West Indies, and Brazil (from Piauí, Pará, Santa Catarina to Rio Grande do Sul) (Abele & Kim, 1989; Almeida & Ferraz, 2006; Alves, Barros-Alves, Cobo et al., 2012; Coelho et al., 2008; Coelho-Filho, 2006; Mantelatto et al., 2020).

Material examined. 3 M; size range: 9.33 ≤ CW ≤ 8.61 mm; CCDB 6533. 

Panopeus austrobesus Williams, 1983 

(Fig. 7B)

Diagnosis and morphological description: Melo (1996); morphometric and taxonomic comments of P. austrobesus species: Negreiros-Fransozo and Fransozo (2003). 

Taxonomic summary

Type locality. Paranagua, Brazil (Williams, 1983).

Geographic distribution. Western Atlantic – Brazil (from Rio de Janeiro to Rio Grande do Sul), and Uruguay (Alves, Barros-Alves, Cobo et al., 2012; Mantelatto et al., 2020; Melo, 1998).

Material examined. 1 F; size: 6.75 mm CW; CCDB 6534.

Panopeus harttii Smith, 1869

Diagnosis and morphological description: Melo (1996); taxonomic comments for P. hartii species: Abele and Kim (1986). 

Taxonomic summary

Type locality. Locality not given by the authors.

Geographic distribution. Western Atlantic – Florida, Gulf of Mexico, Antilles, Ascension Island, and Brazil (from Maranhão to São Paulo) (Alves, Barros-Alves, Cobo et al., 2012; Coelho et al., 2008; Manning & Chace, 1990; Mantelatto et al., 2020; Melo, 1998, 2008; Ng et al., 2008).

Material examined. 1 M, size: 4.98 mm CW; 1 F, size: 5.55 mm CW; CCDB 6535. 

Panopeus rugosus A. Milne-Edwards, 1880 

(Fig. 7C)

Diagnosis and morphological description: Melo (1996); taxonomic comments for P. rugosus species: Abele and Kim (1986). 

Taxonomic summary

Type locality. Bahia, Brazil (Milne-Edwards, 1873-1881).

Geographic distribution. Western Atlantic – Florida, Gulf of Mexico, Central America, Antilles, Guianas, northern South America, and Brazil (from Alagoas to Rio Grande do Sul) (Almeida & Ferraz, 2006; Alves, Barros-Alves, Cobo et al., 2012; Coelho et al., 2008; Mantelatto et al., 2020; Melo, 2008; Ng et al., 2008).

Material examined. 10 M, size range: 4.27 ≤ CW ≤ 19.43 mm; 5 F, size range: 6.62 ≤ CW ≤ 10.33 mm; 1 OF, size: 8.54 mm CW; 1 J, size: 4.22 mm CW; CCDB 6536.

Family Pseudorhombilidae Alcock, 1900

Micropanope sculptipes Stimpson, 1871 

(Fig. 7D)

Diagnosis and morphological description: Melo (1996); taxonomic comments for M. sculptipes species: Martin and Abele (1986). 

Taxonomic summary

Type locality. Florida, USA (as Micropanope pugilator) (Milne-Edwards, 1873-1881).

Geographic distribution. Western Atlantic – North Carolina, South Carolina, Florida, Gulf of Mexico, West Indies, and Brazil (Pará, Rio de Janeiro, and São Paulo) (Alves, Barros-Alves, Cobo et al., 2012; Coelho et al., 2008; Mantelatto et al., 2020; Melo, 1998).

Material examined. 3 M, size range: 3.65 ≤ CW ≤ 3.86 mm; 13 F, size range: 3.33 ≤ CW ≤ 6.18 mm; 2 OF, size range: 3.67 ≤ CW ≤ 5.01 mm; 1 J size: 3.16 mm CW; CCDB 6539.

Scopolius nuttingi (Rathbun, 1898) 

(Fig. 8A)

Diagnosis and morphological description: Melo (1996) (as Micropanope nuttingi); taxonomic comments for Scopolius genus and S. nuttingi species: Števčić (2011). 

Taxonomic summary

Type locality. Bahamas banks (as Xanthias nuttingi) (Rathbun, 1898).

Geographic distribution. Western Atlantic – North Carolina, Florida, Gulf of Mexico, Antilles, West Indies, Surinam, and Brazil (from Amapá to São Paulo) (Alves, Barros-Alves, Cobo et al., 2012; Coelho et al., 2008; Mantelatto et al., 2020; Melo, 1998, 2008). 

Material examined. 14 M, size range: 2.63 ≤ CW ≤ 9.96 mm; 4 F, size range: 3.81 ≤ CW ≤ 4.77 mm; 2 OF, size range: 4.06 ≤ CW ≤ 4.26 mm; 2 J, size range: 2.92 ≤ CW ≤ 3.72 mm; CCDB 6540.

Family Xanthidae MacLeay, 1838

Subfamily Xanthinae MacLeay, 1838

Cataleptodius floridanus (Gibbes, 1850)

Diagnosis and morphological description: Melo (1996); taxonomic comments for C. floridanus species: Abele and Kim (1986). 

Taxonomic summary

Type locality. Key West, Florida, USA (as Chlorodius floridanus) (Gibbes, 1850).

Geographic distribution. Western Atlantic – Florida, Gulf of Mexico, Bermuda, Antilles, Central America, northeastern of South America, and Brazil (from Ceará to São Paulo). Eastern Atlantic – Guinea to Gabon (Almeida & Coelho, 2008; Alves, Barros-Alves, Cobo et al., 2012; Coelho et al., 2008; Mantelatto et al., 2020; Melo, 1996).

Material examined. 1 M, size: 10.50 mm CW; CCDB 6537.

Melybia thalamita Stimpson, 1871 

(Fig. 8B)

Diagnosis and morphological description: Melo (1996); taxonomic comments for M. thalamita species: Thoma and Felder (2020).

Taxonomic summary

Type locality. Tortuga islands (Stimpson, 1871b). 

Geographic distribution. Western Atlantic – North Carolina, Florida, Gulf of Mexico, West Indies, northern South America, and Brazil (Amapá, Pará, Ceará to São Paulo (Alves, Barros-Alves, Cobo et al., 2012; Coelho et al., 2008; Coelho-Filho, 2006; Mantelatto et al., 2020; Melo, 1998, 2008). 

Material examined. 2 J, size range: 1.59 ≤ CW ≤ 2.68 mm; CCDB 6538.

Xanthodius parvulus (Fabricius, 1793) 

(Fig. 8C)

Diagnosis and morphological description: Melo (1996).

Taxonomic summary

Type locality. Haiti (as Chlorodius americanos) (De Saussure 1857).

Geographic distribution. Western Atlantic – Florida, Gulf of Mexico, Cuba, Antilles, Venezuela, Bermuda, and Brazil (Atol das Rocas, Fernando de Noronha, Espírito Santo, and São Paulo) (Alves, Barros-Alves, Cobo et al., 2012; Diez-García & Capote, 2015; Mantelatto et al., 2020; Melo, 1998; Tavares et al., 2017). 

Material examined. 33 M, size range: 4.45 ≤ CW ≤ 16.07 mm; 35 F, size range: 4.55 ≤ CW ≤ 12.5 mm; 9 OF, size range: 8.08 ≤ CW ≤ 15.53 mm; 24 J, size range: 2.22 ≤ CW ≤ 4.78 mm; CCDB 6541.

Williamstimpsonia denticulatus (White, 1848) 

(Fig. 8D)

Diagnosis and morphological description: Melo (1996) (as Xanthodius denticulatus); description of the new genus and combination with this species: Števčić (2011).

Taxonomic summary

Type locality. West Indies (as Xantho denticulatus) (White, 1848).

Geographic distribution. Western Atlantic – Bermudas, Bahamas, Gulf of Mexico Florida, north and south coast of Cuba, Antilles, Venezuela, Panama, and Brazil (reefs of São Pedro and São Paulo, Ceará, and from Bahia to São Paulo). Central Atlantic – Ascension Island. Eastern Atlantic – Ghana, and the offshore island of the Gulf of Guinea (Alves et al., 2006; Alves, Barros-Alves, Cobo et al., 2012; Coelho et al., 2008; Diez-García & Capote, 2015; Manning & Chace, 1990; Mantelatto et al., 2020; Melo, 1998) as Xanthodius denticulatus (De Grave et al., 2014).

Material examined. 1 M, size: 18.25 mm CW; 2 OF, size range: 15.13 ≤ CW ≤ 15.77 mm; CCDB 6542.

Subfamily Zosiminae Alcock, 1989

Platypodiella spectabilis (Herbst, 1794) 

(Fig. 8E)

Diagnosis and morphological description: Melo (1996); taxonomic comments for P. spectabilis species, and color variation: Martin and Zimmerman (2007) and Hartog and Türkay (1991). 

Taxonomic summary

Type locality. Guadeloupe (as Cancer venustus) (Desbonne & Schramm, 1867).

Geographic distribution. Western Atlantic – Bermuda, Florida, Gulf of Mexico, Antilles, Venezuela, and Brazil (Fernando de Noronha, Trindade Island, from Rio Grande do Norte to São Paulo) (Alves, Barros-Alves, Cobo et al., 2012; Coelho et al., 2008; Giraldes, Coelho-Filho, & Coelho et al., 2015; Giraldes, Coelho-Filho, & Smyth, 2015; Mantelatto et al., 2020; Tavares et al., 2017).

Material examined. 2 M, size range: 12.35 ≤ CW ≤ 25.88 mm; CCDB 6543. 

The Shannon diversity index

The combination of methodology showed higher Shannon diversity value (H = 5.71) fallowed by ARS (H = 5.6), and the active search showing the lowest diversity value (H = 4.47). The rarefaction curve showed that the combined methods are useful and increase the diversity (Fig. 9).

Discussion

The present work reveals a region with an important diversity of decapod crustaceans (crabs and anomurans). Here we register a protected by lawpreserved area, embracing the most common and especially relatively rare species on the coast of São Paulo. This demonstrates the importance of the Marine State Park of Laje de Santos (MSPLS) as an area of refuge, preservation, and maintenance of diversity, particularly as it is far from the coast and therefore has a high potential to remain a “no-take” area.

The combination of sampling methodologies was important for carrying out our survey (Fig. 9). Traps seem to be an excellent alternative for sampling cryptic habitats. There are 2 efficient types of trap for this purpose: the bait and the refuge traps – the first one is specially used to capture active individuals and sometimes can be biased to certain sizes and sexes of specimens (Calado & Narciso, 2004; Osawa et al., 2015). It is important to note that bait traps cannot remain in the environment for long periods, however, the refuge traps (like such as the present ARS), that which generally allows access to smaller individuals, like such as juveniles and small young adults, can remain in the environment for long periods (Osawa et al., 2015); and refuge traps are efficient for sampling several members of the decapod fauna. 

A total of 987 individuals distributed into 32 species, 22 genera, and 11 families were determined, and 24 of them are documented with colour plates. We recorded 2 anomuran species with new meridional records. The porcellanid, Petrolisthes amoenus had its distribution extended approximately 135 km to the south; the previously southern record was from Victoria island (Alves et al., 2011). The other anomuran with a new meridional record is Dardanus venosus, which was previously recorded up to the Ubatuba region (Mantelatto et al., 2001).

For the hermit crabs, we sampled 5 species, with Pagurus brevidactylus and Paguristes tortugae being the 2 most abundant species in MSPLS. Previous studies revealed that both species were also the most abundant in the consolidated substrate of some island areas of São Paulo state (Lima et al., 2014, 2018; Mantelatto & Garcia, 2002). Pagurus criniticornis, also often found in shallow waters of the non-consolidated substrate in the region (Mantelatto & Garcia, 2002), was recorded in MSPLS in the interface from the consolidated to the non-consolidated substrate, close to the soft bottom. With the same pattern in this interface was D. venosus, which has its distribution also extended to the MSPLS with a new meridional record, approximately 135 km south from its previous record from Anchieta Island, in northern littoral of São Paulo state (Mantelatto et al., 2001). The other species sampled was C. tibicen, which is a common hermit crab found in intertidal and shallow water zones (Fransozo & Mantelatto, 1998; Garcia & Mantelatto, 2000; Hazlett, 1966), widely distributed in the Western Atlantic (Mandai et al., 2018; Nucci & Melo, 2015).

The Brachyura occur in both the rocky and the soft substrates. Many works were focused on establishing the composition of this group at the non-consolidated bottoms in São Paulo State (Bertini & Fransozo, 2004; Bertini et al., 2004, 2010; Braga et al., 2005; Fransozo et al., 1992; Mantelatto & Fransozo, 2000), and the register of this group in island and rocky subtidal zones is focused in areas of the northern coast of São Paulo (Alves, Barros-Alves, Cobo et al., 2012; Alves, Barros-Alves, Teixeira et al., 2012; Mantelatto, Faria et al., 2004; Mantelatto, Biagi et al., 2004; Mantelatto & Corrêa, 1996; Mantelatto & Souza-Carey, 1998). Alves, Barros-Alves, Cobo et al. (2012) made the richest checklist of Brachyura crabs for consolidated substrates on the Brazilian coast, with 42 species recorded. Just 3 of the species recorded in the present work were not sampled by the authors in the Victoria Archipelago (S. furcatus, P. caribbaeus, and A. bermudensis), probably because those species represent rare, or occasional species, with no more than 3 specimens of them being sampled in the present work (Barlow et al., 2010; Straatsma & Egli, 2012).

Mithraculus forceps was, by far, the most representative species in the present work. It seems to be a very common species in shallow-rocky bottoms and is very exploited as ornamental crab for the aquarium trade (Penha-Lopes et al., 2007). The biology and ecology features of this species are well-known for the São Paulo State coast (Cobo, 2002, 2006; Cobo & Okamori, 2008; Mantelatto, Biagi et al., 2004). Thus, this is a key-species that deserves attention on their conservation status, to make possible that the community remains in equilibrium with ecosystem and exploitation as ornaments. 

Recognizing the importance and sensitive status of conservation of “no-take marine areas”, the MSPLS crustacean fauna is representative. Since the management plans for the area are still being implemented, this study provides the first record of decapod crustaceans for the park and therefore can be used as a baseline for local fauna monitoring programs and conservation planning.

Acknowledgments

The major support for this study was provided by Grants from the “Coordenação de Aperfeiçoamento de Pessoal de Nível Superior” (CAPES/CIMAR II 23038.004310/2014-85, 23038.004308/201414; CAPES/PROEX 23038.000802/2018-25; CAPES PRINT 88881.310767/2018-01). Additional support came from FAPESP (Process 2015/01959-5 by master’s degree scholarship program to Moraes, IRR). We thank Jéssica Colavite, Laira Lianos, Michele Mollemberg, and Nadashine Parasram for all their help with the sorting process in all material sampled. We also thank all the members of the SCUBA dive performance: Orion Dive, Ubatuba Adventure and Omnimmare, and all the people from the Laje de Santos Institute for their support during the field activities. The authors are also grateful to all members from NEBECC and LABCAM laboratory for contributing to the final version of the manuscript. ALC and FLM thank Conselho Nacional de Desenvolvimento Científico e Técnológico – CNPq for ongoing scholarships (311034/2018-7 and 304968/2014-5, respectively). Field sampling license permission COTEC No. 91/2015 D187/2014 BA, PROCESS SMA No.: 260108-010.480/2014.

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