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Cuscohoplininus pagoreni: a new genus and species of Hoplinini stilt bug from Peru (Heteroptera: Berytidae).

RESUMEN

La familia Berytidae es cosmopolita y esta integrada por chinches alargadas, con cuerpo generalmente cilindrico y con antenas y patas muy largas. Los miembros de la tribu Hoplinini se caracterizan por carecer de canal la glandula repugnatoria y por poseer un proceso caudal dirigido dorsalmente sobre el borde posterior de la capsula genital masculina (ausente en Xenoloma y Cuscohoplininus). Describimos un nuevo genero y especie: Cuscohoplininus pagoreni de Peru. Se tomaron fotografias de microscopia electronica para ilustrar estructuras de importancia taxonomica. Entre los ocho generos conocidos de la tribu Hoplinini, Cuscohoplininus n. gen. es similar al genero Parajalysus en aspecto general y en tamano. Sin embargo, puede distinguirse asi: Parajalysus se caracteriza por poseer cuatro grandes espinas erectas sobre el pronoto, una en el centro del lobulo anterior, una en cada angulo humeral y, la cuarta, tambien sobre el lobulo posterior sobre el margen posterior; por otro lado Cuscohoplininus tiene una sola espina sobre el pronoto situada sobre el lobulo anterior, una espina escutelar (Parajalysus presenta solo un tuberculo sobre el escutelo) y carece de proceso caudal.

Palabras clave: Heteroptera, Berytidae, nuevo genero, nueva especie, Peru.

Abstract: The Berytidae or stilt bugs are a cosmopolitan family of lygaeoid bugs, which are slender, elongate insects, with generally cylindrical bodies and very long, slender antennae and legs. Members of the tribe Hoplinini are characterized by the lack of a distinct metapleural scent channel and the possession of a dorsally directed process on the caudal edge of the male genitalia capsule (absent in Xenoloma and Cuscohoplininus). in this paper, we described the new genus and species Cuscohoplininus pagoreni from Peru. Scanning electron micrographs are provided to illustrate taxonomically important structures. Among the eight genera known in the tribe Hoplinini, the new genus Cuscohoplininus resembles Parajalysus in general aspect and size, but can be easily distinguished by the following characters: Parajalysus is characterized by the four large, erect pronotal spines, one centered on the anterior lobe, and on the posterior lobe, one at each humeral angle and one at the base of the meson; whereas, Cuscohoplininus has a single spine on the anterior pronotal lobe, an elongate scutellar spine (a tubercle is present in Parajalysus), and lacks a process on the caudal edge of the male genitalia capsule. Rev. Biol. Trop. 55 (2): 673-676. Epub 2007 June, 29.

Key words: Heteroptera, Berytidae, new genus, new species, Peru.

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The Berytidae or stilt bugs are a cosmopolitan family of lygaeoid bugs. Berytids are slender, elongate insects, with generally cylindrical bodies and very long, slender antennae and legs. This family has phylogenetic affinities with the Cymidae, Ninidae, Colobathristidae and Malcidae (Henry 1997a, b).

Henry (1997a) provided a phylogenetic analysis of berytid genera of the world in which he proposed a major rearrangement of the intrafamilial classification, recognizing three subfamilies: Berytinae, Metacanthinae and Gampsocorinae. The Gampsocorinae include the Eastern Hemisphere tribe Gampsocorini and the Western Hemisphere tribe Hoplinini which comprises eight New World genera. The members of Hoplinini are characterized by the lack of a distinct metapleural scent channel and the possession of a dorsally directed process on the caudal edge of the male genitalia capsule (absent in Xenoloma and Cuscohoplininus). In this paper, we describe a new genus and species of this tribe from Peru.

MATERIALS AND METHODS

The material examined belongs to the collection of Museo de Ciencias Naturales de La Plata, Buenos Aires, Argentina (MLP). Scanning electron micrographs were made from a specimen mounted on a stub, sputter coated with a gold palladium alloy, and studied with a JEOL T-100 SEM.

RESULTS

Cuscohoplininus new genus

Diagnosis: This genus is easily distinguishable from the other Hoplinini by the presence of only one pronotal spine centered on the anterior lobe.

Description: Medium sized (Total length: 5.52-6.42 mm). Head smooth, impunctate, eyes relatively small, postocular distance at least twice as long as eye length. Ocelli widely set behind eyes, near anterior margin of pronotum. Vertex convex. Antennae long, slender, segment one longest, segments two and three subequal in length, and segment four shortest and fusiform. Pronotum strongly convex, longer than wide, with two distinct lobes, lateral margins with a low carina; anterior lobe basally smooth and anteriorly punctate, armed with one short spine medially; posterior lobe unarmed, distinctly punctate, with a median carina. Scutellum armed with one long spine. Hemelytra hyaline, translucent, yellowish. Propleura punctate. Pro- and mesosternum with wide smooth median (rostral) groove. Ostiolar evaporative area restricted to upper half of the mesopleuron. Abdomen smooth, shiny. Caudal edge of male genitalia capsule lacking a dorsally directed process.

Etymology: The generic name is composed by "Cusco" the department of Peru where the specimens were collected, and the tribal name Hoplinini.

Cuscohoplininus pagoreni n. sp.

Description: Holotype male: Length 5.66 mm. General coloration pale brown; subglabrous. Head (Fig. 1, 2): Length 0.6 mm, width 0.55 mm; vertex 0.32 mm. Rostrum: reaching middle of mesosternum; ventrally darker than dorsum. Antenna: Segment I, length 4.95 mm; II, 2.45 mm; III, 3.00 mm; IV 0.84 mm; uniformly dark brown; segments I, II and III weakly clavate; segment IV fusiform. Pronotum (Fig. 1, 4): Length 1.13 mm, basal width 0.92. Scutellum (Fig. 3): with slender spine, 0.25 mm long. Hemelytron: macropterous, elongate, exochorium narrow and elongate, extending to sixth abdominal segment; membrane translucent, finely spotted. Ventral surface: pale brown, impunctate, abdomen smooth and shining. Ostiolar evaporative area (Fig. 4): reduced, subtriangular. Legs: Femora pale brown with numerous dark brown spots, sub-apically darker without spots; with short sparse setae. Tibiae dark brown, with short sparse setae. Femoral lengths: Pro- 3.26 mm; meso- 3.58 mm; meta- 5.21 mm. Tibial lengths: Pro- 3.58 mm; meso- 4.16 mm; meta- 7.26 mm. Genital capsule (Fig. 5, 6): elongate, subtriangular.

Measurements of male paratype: Length 5.74 mm. Head: Length 0.68 mm, width 0.59 mm; vertex 0.34 mm. Antenna: Segment I, length 4.47 mm; II, 2.16 mm; III, 2.68 mm; IV, 0.77 mm. Pronotum: length 1.19 mm, basal width 1.01 mm. Scutellar spine 0.3 mm long. Legs: Femoral lengths: Pro- 2.71 mm; meso-3.32 mm; meta- 4.68 mm. Tibial lengths: Pro-3.21 mm; meso- 3.95 mm; meta- 7.00 mm.

Female (n= 6): Length 5.52-6.42 mm (mean 5.92 mm). Head: Length 0.63-0.75 mm (mean 0.70 mm), width 0.54-0.58 mm (mean 0.57 mm); vertex 0.34-0.37 mm (mean 0.36 mm). Antenna: Segment I, length 4.45-4.68 mm (mean 4.53 mm); II, 2.21-2.32 mm (mean 2.25 mm); III, 2.68-2.89 mm (mean 2.78 mm); IV, 0.79-0.84 mm (mean 0.82 mm). Total length 10.15-10.69 mm (mean 10.39 mm). Pronotum: Length 1.15-1.26 mm (mean 1.20 mm), basal width 1.15-1.26 mm (mean 1.20 mm) Scutellar spine 0.26-0.32 mm (mean 0.29 mm). Legs: Femoral lengths: Pro- 2.95-3.05 mm (mean 3.00 mm); meso-3.37-3.58 mm (mean 3.47 mm); meta- 4.68-5.16 mm (mean 4.92 mm). Tibial lengths: Pro- 3.21-3.42 mm (mean 3.32 mm); meso-3.82-4.03 mm (mean 3.93 mm); meta- 7.21-7.58 mm (mean 7.42 mm).

Very similar to male in all aspects.

Host: Unknown.

Distribution: Peru, Cusco, rainforest.

Etymology: The specific epithet pagoreni refers to the small town and homonymous river where the holotype was collected.

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Type data: Holotype: male, Peru: Cusco, Pagoreni, VII-(20)04, Williams, luz, 72[degrees]54'07" W 11[degrees]42'22" S (MLP). Paratypes: 4 females, same data. 1 male, 2 females, Peru: Nuevo Mundo, Base Pluspetrol, VII-(20)04, J. Williams, luz, 73[degrees]08'30"W 11[degrees]33'02"S (MLP).

DISCUSSION

Acording to Henry's (1997a) phylogenetic hypothesis, the Hoplinini can be divided into two clades: one including Hoplinus Stal, Phaconotus Harris, Oedalocanthus Henry and Pronotacantha Uhler that possess a ventrally extended evaporative area, and a second clade comprising Diabolonotus Henry, Xenoloma Harris, Metajalysus Stusak and Parajalysus Distant with ostiolar area reduced to a circular swollen area near the middle of metapleural area. The reduced ostiolar area of Cuscohoplininus permits us to assign it to the latter clade.

This new genus resembles Parajalysus in general aspect and size (Parajalysus and Cuscohoplininus being the only two genera longer than 5 mm). Parajalysus is characterized by the four large, erect pronotal spines, one centered on the anterior lobe, and on the posterior lobe, one at each humeral angle, and one at the base of the meson; whereas Cuscohoplininus has a single spine on the pronotum, on the anterior pronotal lobe, an elongate scutellar spine (a tubercle is present in Parajalysus), and lacks a process on the caudal edge of the male genitalia capsule.

Cuscohoplininus runs to couplet 7 in Henry's key to Hoplinini genera of the Western Hemisphere (Henry 1997c); this couplet identifies Phaconotus and Oedalocanthus, but Cuscohoplininus can be easily distinguished from both genera by the absence of rounded tubercles on the pronotum.

ACKNOWLEDGMENTS

Our gratitude goes to Pluspetrol Peru Corporation, S.A. and ERM Peru, S.A. for financial support of the fieldwork that was carried out during the environmental impact assessment of block 56 in Pagoreni and Nuevo Mundo, Cusco. This work was funded by the Consejo Nacional de investigaciones Cientificas y Tecnicas (CONICET), Argentina.

Received 12-I-2006. Corrected 17-X-2006. Accepted 30-I-2007.

REFERENCES

Henry, T.J. 1997a. Cladistic analysis and revision of the stilt bug genera of the world (Heteroptera: Berytidae). Contr. Am. Entomol. Inst. 30: 1-100.

Henry, T.J. 1997b. Phylogenetic analysis of family groups within the infraorder Pentatomomorpha (Hemiptera: Heteroptera), with emphasis on the Lygaeoidea. Ann. Entomol. Soc. Am. 90: 275-301.

Henry, T.J. 1997c. Monograph of the stilt bugs, or Berytidae (Heteroptera), of the Western Hemisphere. Mem. Entomol. Soc. Wash. 19: 1-149.

Pablo M. Dellape & Diego L. Carpintero

Division Entomologia, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque s/n,

1900 La Plata, Argentina; pdellape@fcnym.unlp.edu.ar; dcarpint@fcnym.unlp.e du.ar
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Author:Dellape, Pablo M.; Carpintero, Diego L.
Publication:Revista de Biologia Tropical
Date:Jun 1, 2007
Words:1723
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