Pentacentrus acutiparamerus Liu & Shi

Liu, Hao-Yu, Mao, Shao-Li & Shi, Fu-Ming, 2014, Review of the genus Pentacentrus Saussure (Orthoptera: Gryllidae: Pentacentrinae) from China, Zootaxa 3838 (5), pp. 557-566 : 559-560

1. Pentacentrus acutiparamerus Liu & Shi sp. nov.

Figs. 1–6

Description. Male. Body small and slender. Head rather short, frontal rostrum distinctly wider than scapus (7: 5); median ocellus small and transverse oval, lateral ocelli slightly large and nearly round; eyes oval and distinctly projecting; apical joint of maxillary palpus distinctly widened and sloped at apex, slightly longer than third joint; apical joint of labial palpus slightly widened, slightly longer than second joint. Pronotum distinctly wider than long, disc with a pair of nearly triangular impressions; anterior margin straight, posterior margin sinuate and slightly protruding around midway; lateral lobes longer than high, anterior lower angles widely rounded, posterior lower angles narrowly rounded, lower margin slightly sinuate. Tegmina slightly extending over apex of abdomen, with 4 longitudinal veins on dorsal area; hind wings distinctly longer than tegmina. Fore tibia with a large and oblong internal tympanum, nearly as long as half length of tibia, without external tympanum. Hind tibia with 3 long spines along either margin of apical part of dorsal side, and several small spines on basal part, of which 2–4 along outer margin and 1–2 along inner margin. Abdominal tergite I with a pair of medium-sized swellings, II with a small swelling in centre and inclined forwards ( Fig. 1 ).

Supra-anal plate obviously wider than long, distinctly narrowed posteriorly; anterior angles strongly protruding posteriorly; dorsal area densely covered with short setae in centre and posterior part; posterior margin distinctly emarginated in middle ( Fig. 2 ). Subgenital plate quite long, slightly narrowed posteriorly, with posterior margin nearly straight ( Fig. 3 ). Genitalia ( Figs 4–6 ): epiphallus rather short; medial lobes of epiphallus small and acute teeth-like; lateral lobes of epiphallus long sac-like, densely covered with short setae; epiphallus parameres rather long and narrow, acute at apex, covered with several long hairs; ectophallus parameres rather short and bent outwards, acute at apex.

Female. Similar to male. Subgenital plate slightly longer than wide, with posterior margin distinctly emarginated midway, posterior angles protruding in angular fashion. Ovipositor slightly short and bent upwards.

Coloration. Body brown. Antennae white in middle part, others brown. Tegmina light brown, each transverse vein surrounded by a small irregular brown spot; lateral field brown. Fore and mid-femora dark brown, other part and hind leg light brown.

Measurements (mm). Male: body 8.9–11.0, length with wings 13.0–14.2, pronotum 1.3–1.5, tegmen 7.8–8.5, hind femur 5.8–6.2; female: body 9.0, length with wings 13.5, pronotum 1.5, tegmen 8.3, hind femur 6.4, ovipositor 3.7.

Type material examined. Holotype ♂, CHINA, Yunnan, Pu’er, Caiyanghe, 28.VII.2007, leg. Fu-Ming Shi. Paratypes: 1♂, same data as the holotype; 1♀, CHINA, Yunnan, Mengla, Menglun, 9.VIII.2007, leg. Fu-Ming Shi and Shao-Li Mao; 1♂, 8.VIII.2007, other data as the holotype.

Distribution. China (Yunnan).

Diagnosis. This new species is related to Pentacentrus bituberus Liu & Shi , but can be distinguished by supraanal plate differently shaped at short setae area, posterior margin distinctly emarginated in middle; subgenital plate with posterior margin nearly straight; genitalia distinctly longer than wide, especially epiphallus parameres and lateral lobes rather long.

Etymology. This new specific name is derived from the Latin acutus (acute) + paramerus (parameres), a reference to apex of epiphallus parameres distinctly acute.

Figures

FIGURES 1 – 6 Pentacentrus acutiparamerus Liu & Shi sp. nov. Male: 1. abdominal tergites I – II, dorsal view; 2. supra-anal plate, dorsal view; 3. subgenital plate, ventral view; 4 – 6. genitalia (4. dorsal view; 5. ventral view; 6. lateral view). Scale bar = 1 mm