Pentacentrus medogensis, Zong & Qiu & Liu, 2017

Zong, Le, Qiu, Tengfei & Liu, Haoyu, 2017, Description of two new species of the genus Pentacentrus Saussure from China (Orthoptera: Gryllidae), Zootaxa 4311 (1), pp. 145-150 : 146-148

Pentacentrus medogensis sp. nov.

Figs. 1–2 , 4–7

http://lsid.speciesfile.org/urn:lsid: Orthoptera .speciesfile.org:TaxonName:498634

Pentacentrus birmanus Chopard : Yin & Liu, 1995: 77, 150.

Type material. Holotype ♂: CHINA, Xizang, Mêdog, Beibeng , 3.VII.2016, leg. Tengfei Qiu. Paratypes: 1♀: same data as the holotype ; 1♂: 4.VII.2016, other data as the holotype; 1♀: Xizang, Mêdog , 6.VIII.2016, other data as the holotype ; 1♂: Xizang, Mêdog, Renqinbengsi , 17.VIII.2016, leg. Zhilin Chen.

Diagnosis. This new species is similar to P. birmanus Chopard, 1969 , but differs from the latter in the shape of the male supra-anal plate; ectophallus parameres of genitalia rather long, and epiphallus parameres bent outwards at apex. In the P. birmanus , lateral margin of supra-anal plate distinctly emarginated; ectophallus parameres distinctly short, and epiphallus parameres bent inwards at apex.

Description. Male: Body small and slender ( Fig. 1 ). Head relatively short, frontal rostrum almost equal to scapus wide; median ocellus small and transverse oval; lateral ocellus rather large and oval; eyes oval and project obviously; apical joint of maxillary palpus distinctly widened and slightly longer than third joint; apical joint of labial palpus slight widened, length nearly as same as second joint. Pronotum obviously wider than long, disc with a pair of nearly triangular shape; anterior margin straight, posterior margin sinuate and slightly protruding around midway; lateral lobes longer than high, anterior lower angles round, posterior lower angles slightly vertical, lower margin straight. Tegmina extending over apex of abdomen, dorsal area with four longitudinal veins; hind wings longer than tegmina. Fore tibia with an oblong internal tympanum, nearly one-fourth the length of tibia, without external tympanum. Hind tibia with three long spines along either margin of dorsal side of apical part, and some very small spines on basal part, of which 2-4 along outer margin and 1–3 along inner margin. Abdominal tergite I with a pair of small swelling, tergite II with a large triangular swelling at the center.

Supra-anal plate ( Fig. 7 ) distinctly wider than long, slightly narrowed posterior, covered with short setae in dorsal area; posterior margin distinctly emarginated in middle. Subgenital plate rather long, narrowed apically, posterior nearly straight. Genitalia ( Figs. 4–6 ): epiphallus rather short, distinctly transverse; lateral lobes of epiphallus wide, acute at apex; medial lobes of epiphallus large sac-like, with a pair of small, long acute teeth at bases; epiphallus parameres very long, covered with several long hairs and blunt at apex; ectophallus parameres rather long, reaching one-third of epiphallus parameres.

Female ( Fig. 2 ): Similar to male, differs as follows. Supra-anal plate slightly width as same as length, with rounded posterior margin. Subgenital plate rather short, with distinctly emarginated midway, posterior angles protruding. Ovipositor slightly long, distinctly no reaching apex of hind wings, and slightly swelling at nearly apex.

Coloration. Body dark brown. Antennae white in middle part, others brown. Tegmina light brown with some irregular black spot; lateral field brown. All femora dark brown, and hind femora with light brown bands on outer side, other part brown.

Measurements (mm). Male: body 8.0–9.0, length with wings 14.0–14.5, pronotum 1.2–1.3, tegmen 7.5–8.5, hind femur 5.6–6.2. Female: body 9.2–9.5, length with wings 14.5–14.8, pronotum 1.2–1.3, tegmen 8.2–8.3, hind femur 6.2–6.4, ovipositor 3.9–4.0.

Distribution. China (Xizang).

Etymology. The specific name is derived from its type locality, Mêdog ( China: Xizang).

Remarks. Yin & Liu identified one species belonging to the genus Pentacentrus collected from Xizang, China, viz. P. birmanus Chopard, 1969 . They illustrated the genitalia, which differed from the type description and three illustrations published by Chopard in 1969; in fact, Yin & Liu’s four illustrations are very similar to P. medogensis sp. n., collected from the same locality. They are actually the same species, and P. birmanus should be excluded from the Chinese fauna.

Figures

FIGURES 1 – 3. Habitus. 1 – 2. Pentacentrus medogensis sp. nov. C P. sororius sp. nov., dorsal view. 1, 3. male; 2. female. Scale bars 2 mm.

FIGURES 4 – 7. Pentacentrus medogensis sp. nov. 4 – 6. Genitalia (4. dorsal view; 5. ventral view; 6. lateral view). 7. Supra-anal plate, dorsal view. Scale bars 0.5 mm.