Hemithyrsocera Saussure, 1893

Wang, Zongqing & Che, Yanli, 2017, Three new species of cockroach genus Hemithyrsocera Saussure, 1893 (Blattodea: Ectobiidae: Blattellinae) with redescriptions of two known species from China, Zootaxa 4263 (3), pp. 543-556 : 544

Hemithyrsocera Saussure, 1893

Type species: Blatta palliata Fabricius, 1798

Hemithyrsocera Saussure, 1893: 57 .

Mopserina Princis, 1950: 218 , synonymized by Princis, 1971: 1124. Plumiger Hebard, 1929: 22 , synonymized with Aristiger by Bruijning, 1948: 59. Parasymploce Hebard, 1929: 69 , synonymized by Roth, 1995: 962. Aristiger Hebard, 1940: 139 , synonymized by Roth, 1995: 962.

Generic diagnosis (modified from Che et al. 2009). Tegmina and hind wings fully developed extending well beyond end of abdomen. Tegmen with a posterior branch of radial vein, which is usually forked; M and Cu veins longitudinal. Hind wing with radial vein forked before the mid, M and Cu veins slightly or obviously curved, Cu with 0, 1, 2, rarely 3 complete, and without incomplete branches; apical triangle developed or small. Pronotum nearly elliptical and flattened, concealing head and mesonotum. Fore femur Type A2 or A3; pulvilli on 4 proximal tarsomeres, tarsal claws symmetrical and simple, arolia present. First abdominal tergum unspecialized; seventh abdominal tergum specialized, with medial depressed region, some species also with one lateral lobe on each side. Supra-anal plate symmetrical, with a subcercal (intercercal) process ventrally near the base of each cercus or not. Subgenital plate strongly asymmetrical, hind margin with various shaped processes bearing long spines; styli represented by 1 or 2 large processes, right stylus sometimes presents as a small cylindrical process.

Male genitalia: male genitalia with L3 on left side and L2vm often with a slender rod or filament arising near or beyond the middle.

Remarks. Hemithyrsocera bears close resemblance to Symplocodes in morphology. Both Hemithyrsocera and its close genus Symplocodes have highly complex structure on the hind margin of the subgenital plate, and even the median phallomere (L2vm) of some Hemithyrsocera and Symplocodes species is very similar ( Roth, 1995). And the only character that clearly distinguishes Hemithyrsocera and its close genus Symplocodes is the distinctly toothed tarsal claw or not. Tarsal claws of Symplocodes are heavily and conspicuously dentate on inner margins ( Figs 7–9 ; Zheng et al., 2016); but tarsal claws of Hemithyrsocera are smooth, without any teeth ( Figs 1–6 ).

Distribution. Oriental Region.

Figures

FIGURES 1 – 9. Tarsal claws. 1 – 3 Hemithyrsocera forcipata sp. nov., male: 1 front leg; 2 middle leg; 3 hind leg. 4 – 6 Hemithyrsocera spinibarbis sp. nov., male: 4 front leg; 5 middle leg; 6 hind leg. 7 – 9. Symplocodes manubria, male: 7 front leg; 8 middle leg; 9 hind leg. Scale bars = 0.2 mm.