A new species of Pangaeus (Hemiptera: Heteroptera: Cydnidae: Cydninae), with new records of the genus for Mexico

María Cristina Mayorga-Martínez ⁎ ✉ , Alfredo Mayorga

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© 2017 Universidad Nacional Autónoma de México, Instituto de Biología. This is an open access article under the CC BY-NC-ND license

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Insectos enterradores; Biodiversidad; Clave dicotómica; Chiapas

Introduction

The genus Pangaeus Stål was described by Stål (1862) based on one described species from Mexico, P. piceatus. In his revision of the genus, Froeschner (1960) recognized 23 species distributed from southern Canada to Argentina, and divided them into 2 subgenera: Homaloporus and Pangaeus . This genus can be distinguished from other members of the subfamily Cydninae by the presence of an impressed subapical line, which extends from side to side on the anterior margin of the pronotum ( Froeschner, 1960).

The subgenus Homaloporus contains 6 species and occurs from Guatemala to Canada. Species of this subgenus have the mesopleural evaporatorium limited and separated from the posterolateral angle, and the posterior margin of the sclerite with a polished area ( Froeschner, 1960). The subgenus Pangaeus , on the other hand, has 17 recognized species, and is distributed from Northern Mexico to Guatemala. Members of this subgenus are characterized by having the mesopleural evaporatorium extending and uninterrumped along the posterior margin of the sclerite into a posterolateral angle ( Froeschner, 1960 ). Eight species have so far been recorded for the Mexican territory ( Froeschner, 1960): P. (Homaloporus) bilineatus (Say), P. (Homaloporus) congruus (Uhler), P. (Homaloporus) rugiceps Horvath, P. (Pangaeus) setosus Froeschner, P. (Pangaeus) tuberculipes Froeschner, P. (Pangaeus) impressus Froeschner, P. (Pangaeus) piceatus Stål, P. (Pangaeus) serripes (Westwood). More recently, Mayorga (2002) only reported the presence of 7 species because she was not able to examine specimens of P. congruous.

The 2 studies mentioned above are the only taxonomic works that have been carried out for Mexican species of Pangaeus , and therefore, its actual number of species is expected to be higher for this country. In this work, we describe and illustrate a new species of Pangaeus, P. (P.) cervantesi , from Chiapas. We also report 5 new records for Mexico for the following species: P. (H.) punctilinea, P. (P.) docilis, P. (P.) moestus, and P. (P.) quinquespinosus.

Material and methods

Specimens examined were obtained from the following collections: Colección Nacional de Insectos, Universidad Nacional Autónoma de Mexico, Mexico City (CNIN); Colección Entomológica, Instituto de Ecología, A.C., Xalapa, Veracruz (IEXA), and Colección de Insectos asociados a plantas cultivadas en la Frontera Sur (ECOTAPE). More than 98 specimens were revised. Illustrations were made using a drawing tube device for a microscope Zeiss SV8. Measurements are given in millimeters ± SD and the number of individuals (n ) is specified for each sex. The description of the new species is first presented followed by the new Mexican records of species from the genus organized alphabetically by subgenus.

Description

Pangaeus cervantesi sp. nov.

Material examined : holotype. Male. México, Chiapas, Unión de Juarez, Chiquihuite; 26-29-X-2007; J. García, D Chamé; Cloud forest (CNIN). Paratypes. Same data as holotype, 2♂, 3♀ (CNIN, ECOTAPE).

Diagnosis . This species is mainly distinguished by having the anterior third of the corial margin emarginated and slightly elevated (not present in the remaining species of Pangaeus recorded for Mexico). Pangaeus cervantesi sp. nov., also has the head with the apical third expanded and the middle basal area convex (semicircular, triangular and flat in the remaining species). The new species is morphologically similar to P. bilineatus and P. rugiceps . These 3 species have similar anterolateral margins of pronotum. However, P cervantesi sp. nov. has the margin of the anterior third emarginated slightly elevated and the hind tibiae without sub-basal angulation (as it could be observed as well in P. rugiceps and P. bilineatus).

Body oval, dorsally less convex than ventrally. Coloration: head, pronotum, pro-, meso-, and metapleura, scutellum, femora of all legs, meso- and metatibiae, abdomen, antennal segments I, II, and basal half of III dark brown; apical half of antennal segment III, IV, and V, rostral segments I–IV, protibiae, and hemelytra pale brown. Head wider than long; tylus as long as juga; eyes large and slightly elongate; ocelli small; 5 antennal segments, first one the shortest and V the longest; buccula as high as rostral segment II; rostrum reaching middle of mesocoxae. Thorax: pronotum. Anterior margin concave; dorsally less convex than ventrally; transverse impression just apparent; anterior lobe without punctures; posterior lobe flat and smooth, anterolateral margins with a fine carina and with margin entire. Propleura shiny; mesopleura with evaporatorium reaching anterolateral margin of pleura; metapleura with evaporatorium extended through all pleura; but not reaching lateral margin; osteolar peritreme elongate with apex abruptly terminated. Legs: fore tibiae flat with 9 spines on dorsal margin, hind tibia without sub-basal angulation, and with 5 spines on postero-ventral margin. Scutellum longer than wide, with fine punctures distributed uniformly. Hemelytra with anterior third of margin emarginate and slightly elevated; costa with 2 setigerous punctures; corial surface with scattered punctures; clavus without punctures; hemelytral membrane hyaline, reaching apex of abdomen. Abdomen: ventrally convex, and smooth ( Fig. 1).

Figure 1

Holotype of Pangaeus (Pangaeus) cervantesi sp. n. (scale = 1 mm).

Male genitalia : parameres short, with dorsal and ventral margins entire ( Fig. 2 ), apical margin slightly bifurcate, with numerous setigerous punctures ( Fig. 2).

Figure 2

Paramere of Pangaeus (Pangaeus) cervantesi sp. nov., lateral view.

Male: measurements (n = 3). Body length 6.28 ± 0.1; head length 0.9 ± 0.07; width across eyes 1.5 ± 0.08; interocular distance 1.0 ± 0.08; interocellar distance 0.5 ± 0.04; antennal segments: I 0.3, II 0.38, III 0.43 ± 0.08, IV 0.62 ± 0.04; V 0.76; rostral segments: I 0.73 ± 0.04, II 0.78 ± 0.08, III 0.75 ± 0.07, IV 0.47 ± 0.04; pronotum: length 1.69 ± 0.08, width across frontal margin 1.64 ± 0.04, width across humeral angles 3.1 ± 0.3; scutellum: length 2.25 ± 0.04, width 1.94 ± 0.04; hind leg: femur length 2.02 ± 0.1, tibia length 2.63 ± 0.35, length of tarsal segments: I 0.3, II 0.15, III 0.34.

Female: measurements (n = 2). Body length 6.38 ± 0.21; head length 0.83; width across eyes 1.5 ± 0.04; interocular distance 1.02 ± 0.05; interocellar distance 0.49 ± 0.05; antennal segments: I 0.3, II 0.38, III 0.45, IV 0.562 ± 0.04; V 0.76; rostral segments: I 0.72 ± 0.05, II 0.76 ± 0.1, III 0.76, IV 0.49 ± 0.05; pronotum: length 1.6 ± 0.02, width across frontal margin 1.66 ± 0.1, width across humeral angles 3.19 ± 0.2; scutellum: length 2.31 ± 0.04, width 1.82 ± 0.11; hind leg: femur length 1.86 ± 0.05, tibia length 2.39 ± 0.15, length of tarsal segments: I 0.38, II 0.15, III 0.34 ± 0.08.

Etymology: the name cervantesi is in honor to the late Dr. Luis Cervantes Peredo, a passionate Mexican researcher involved in the study of Hemiptera-Heteroptera.

Distribution : this species is only known from Chiapas, Mexico ( Table 1).

Table 1

List of distribution of Pangaeus species in Mexico. BC = Baja California, BCS = Baja California Sur, CPCH = Campeche, CHIS = Chiapas, COA = Coahuila, COL. = Colima, DF = Distrito Federal, DGO = Durango, GTO = Guanajuato, GRO = Guerrero, HGO = Hidalgo, EM = Estado de México, MICH = Michoacán, MOR = Morelos, NAY = Nayarit, NL = Nuevo León, OAX = Oaxaca, PUE = Puebla, QRTO = Querétaro, QRO = Quintana Roo, SLP = San Luis Potosí, SNLA = Sinaloa, SON = Sonora, TAB = Tabasco, TAMPS = Tamaulipas, VER = Veracruz, YU = Yucatán, ZCA = Zacatecas. New records with*. New species in bold.

Pangaeus (Homaloporus) punctilinea

Material examined : Mexico: Baja California Sur, 1 ♂ 1♀, La Paz, San Bartolo 360 m asl, 07-X-2010, 23°44′09″ N, 109°50′36″ W, matorral xerófilo, C. Mayorga, L. Cervantes, cols. ( Table 1).

Comments : this species was previously reported for Texas, USA. This species represents a new record for Mexico, and was collected in a single locality in Baja California Sur at 360 m., where it was sympatric with P. (H.) bilineatus in the soil, under herbaceous vegetation.

Pangaeus (Pangaeus)docilis

Material examined : Mexico: Campeche, 1 ♂, Grutas X Tacumbilxuna’an, 20-VI-1989, A. Cadena L. Cervantes, cols.; Chiapas, Nahá. 980 m asl, 16.96345°N 91.59341W, 9-VI-2008, Proyecto LLAMA, col.; Chiapas, 1♂, Sierra Morena. 1360 m asl, 16.15.950°N, 93.60530°W, 12-VI-2008, Proyecto LLAMA, col.; Chiapas, 1♂, Playon de la Gloria 167.15919°N, 90.90178°, 1600 m asl, 24-VI-2008, Proyecto LLAMA, col.; Chiapas, 2 ♂ 2♀, Ixta-Comitán Rio Blanco, 10-12-1985, F. Arias, L. Cervantes, R. Barba, cols.; Chiapas, 2 ♂ Comitán 6-IV-1979, E. Barrera, col.; Chiapas, 1♀, Pueblo Nuevo Soluchistan, 1772 m asl, 25-VI-2007, 17°11′50″ N, 92°55′27″ W, bosque pino –encino, G. Ortega, L. Cervantes, C. Mayorga, cols.; Chiapas, 1♀, 8 Km. Salto de Oaxaca 17.5124° N, 92.29442° W, 14-VI-2008, Proyecto LLAMA, col.; Chiapas, 1 ♀, Tuxtla Gutiérrez, el Chorreadero, 13-III-1995, G. Ortega, E. Barrera, cols.; Chiapas, 1 ♂, El Vergel 200 m asl, XI-1939, D. Pelaez, col.; Oaxaca, 1 ♂, San Mateo Yetla, 27-V-1990, E. Barrera, A. Cadena, cols.; Oaxaca, 1♀, Sta Rosa, 22-IV-1983, M. García, col.; Puebla, 1♂ 2 ♀, Km. 10 Carr. Xicotepec Patla, 2-VII-1994, G. Ortega, E. Barrera, col.; Veracruz, 1♂ Estación de Biología Tropical los Tuxtlas, 16-IX- 1989, H. Rojas, J. L. Colín, cols.; Veracruz, 1♂ 1♀, Estación de Biología Tropical, Los Tuxtlas, 14-X-1989, H. Rojas, col.; Veracruz, 1♂, Estación de Biología Tropical Los Tuxtlas, 2-XI-1989, H. Rojas, J. Colin, cols.; Veracruz, 1 ♂, Estación de Biología Tropical Los Tuxtlas, 14-IX-1989, J. L. Colín, H. Rojas, cols.; Veracruz, 1♀, Estación de Biología Tropical los Tuxtlas, 4-III-1985, A. Ibarra, col.; Veracruz, 4 ♂ 1 ♀, Estación de Biología Tropical, los Tuxtlas, Laguna el Zacatal, 16-VI-1990, J. L. Colin, col.; Veracruz, 1 ♂, Estación de Biología Tropical Los Tuxtlas, 10-XII-1989, J. L Colin, H. Rojas, col.; Veracruz, 1♀, Xalapa Ferrer Guardia I-2004, L. Cervantes, col.; Veracruz, 8 ♂ 5 ♀, Estación de Biología Tropical Los Tuxtlas, 11-X-1989, J. L. Colin, H. Rojas, col. ( Table 1).

Comments : this species was previously reported for Guatemala, Panama, Colombia, Venezuela, Brazil, Ecuador and Peru. In Mexico, this is a new record for the country in the Mexican states of Campeche, Chiapas, Oaxaca, Puebla, and Veracruz ( Table 1 ). This is a tropical species, mainly restricted to the Neotropical parts of Mexico in elevations that range from 9 to 2265 m.

Pangaeus (Pangaeus) moestus

Material examined : Mexico: Campeche, 1♂ Ruinas hormiguero, 7-V-1997 A. Contreras, col.; Veracruz 1 ♂, Xalapa VII-1985, J. Peña, col. ( Table 1).

Comments : this species was previously reported for Guatemala and Brazil. This is the first record for Mexico in the states of Campeche and Veracruz. This species can be found at around 1486 m.

Pangaeus (Pangaeus) quinquespinosus

Material examined : Mexico: Campeche, 2 ♂, 30 km. Al Sur Xpujil, 20-III-1982, M. Garcia. A. Ibarra, cols.; Campeche, 2 ♂ 1 ♀, Ruinas Hormiguero, 6-V-1997 A. Contreras, col.; Campeche, 1♂, 30-IV-1997, A. Contreras, col.; Campeche 6 ♂ 3♀, Ruinas Hormiguero 7-V-1997, A. Contreras, col.; Chiapas, 1♂, Bonampak, 25-V-1980, E. Barrera, col.; Chiapas, 1 ♂ 1♀, Frontera Chiapas, 400 m asl, 6-IV-1979, H. Brailovsky, col.; Chiapas, 1 ♂, Km.9 Carr. Palenque Ocozingo, 5-V-1982, A. Ibarra, col.; Chiapas, 1♂, Bonampak, 20-V-1984, M. García, col.; Chiapas, 1♀, Bonampak, 23-25-V-1984, A. Ibarra, col.; Chiapas, 1♀, Chajul, 8-IX-1986, J. Galván, col.; Chiapas, 1♀, Ocosingo Chajul, Reserva Montes Azules 28-IV-5-V-1986, F. Arias, R. Barba, L. Cervantes, cols.; Oaxaca, 1♂, Km. 116 Carr. Tuxtepec Palomares 22-XI-1990, A. Cadena, E. Barrera, cols.; Oaxaca, 1♀, Portillo del Rayo, 31-XI-1987, E. Barrera, col.; Oaxaca, 1♀, Santa Rosa, 22-IV-1983, A. Ibarra, col.; Oaxaca, 1♀, Monte Alban, 18-X-1978, E. Barrera, col.; Oaxaca, 1♀, Santo Domingo Peteapa, Arroyo Las Palmas 330 m asl, 20-III-1990, E. Barrera A. Cadena, cols.; Oaxaca, 1♀, 2 Km. Desviación a Pluma Hidalgo- Carr. San Jose Pacifico Pochutla, 8-VI-2004, E. Barrera, R. Mariño, cols.; Oaxaca, 2♀, Km. 2 Desviación a pluma Hidalgo Carr. Oaxaca- Puerto Angel 8-VI-2004, E. Barrera, R. Mariño, cols.; Oaxaca, 1♀, Pluma Hidalgo, 2-II-1988, A. Cadena E. Ramírez, cols.; Oaxaca, 1♀ 10 km. Al Sur de Valle Nacional, 4-IX-1982, J. Bueno, col.; Veracruz, 3 ♂, Tlapacoyan, 2-VII-1985, J. Bueno, col.; Veracruz, 1 ♂, El Ocotal Chico, Mpio. Soteapa Tuxtla Vercruz, 13-VIII-1980, S. Zaragoza, col.; Veracruz, 1♂, Estación de Biología Tropical Los Tuxtlas, 3-15-XII-1988, E. Mejorada, col.; Veracruz, 1 ♀, Estación de Biología Tropical Los Tuxtlas 30-VII-1989 S. Zaragoza; Veracruz, 2♀, Estación de Biología Tropical Los Tuxtlas, 20-26-II-1985, A. Ibarra, col.; Veracruz, 1♀, Estación de Biología Tropical Los Tuxtlas, 10-VIII-1989, J. l. Colin, H. Rojas, cols.; Veracruz, 1 ♀, Xalapa 24-VIII-1985, J. Peña, col.; Veracruz, 3 ♀, Jalapa, 1-8-IX-1985, J. Peña, col.; Veracruz, 1♀, Salto Eyipantla, 20-II-1984, H. Delfin, col.

Comments : this species was previously reported for Panama and Costa Rica. This is the first report for Mexico in the states of Campeche, Chiapas, Oaxaca and Veracruz ( Table 1 ), in localities with an altitude of about 1965 m.

Key of Mexican species of the genus Pangaeus

Discussion

Most of the species of Pangaeus recorded for the Mexican territory occur in the states of Chiapas, Oaxaca and Veracruz in low deciduous and low evergreen forests, as well as in xerophile scrubs areas. However, this could be due to the bias of collecting effort in other Mexican states. We therefore expect to register additional new species of Pangaeus in other Mexican states, since to date only 9 of the 32 Mexican states have records of Pangaeus species (Table 1).

Acknowledgements

Some of the specimens were collected as part of the project Conacyt (34238-V), “Lygaeidae (Hemiptera-Heteroptera) asociados a Ficus spp. (Moraceae) y su efecto en la depredación de semillas en la región del golfo de México”. Additionally, specimens were collected as part of the project “Diversidad de Hemiptera: Heteroptera de Baja California e islas del golfo de California” funded by Conabio (GT035). We thank Eduardo Chame from Colección de Insectos asociados a plantas cultivadas en la Frontera Sur, for lending us specimens of the new species. We are very grateful to Biol. Carlos Rosas Sánchez (UNAM) for his unconditional help. And thanks to the anonymous reviewers for their observations that helped to improve this work.

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Corresponding author.

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