Platylabia major Dohrn, 1867

Ye, Xiao-Han, Gu, Jun, Zhang, Mei & Chen, Zhi-Teng, 2020, Description of Chelisoches chongqingensis sp. nov. (Dermaptera: Chelisochidae) and redescription of Platylabia major Dohrn, 1867 from China, Zootaxa 4790 (3), pp. 551-563 : 558-559

Platylabia major Dohrn, 1867

Figs. 10–15

Platylabia major Dohrn, 1867: 347 ; Kirby, 1891: 518.

Platylabia sparattoides Bormans, 1900: 459 .

Material examined. Two males and three females, China: Guangdong Province, Huizhou City, Longmen County, Nankunshan Mountain, light trap, June 7, 2019, Ming-Zhi Zhao ; one female, China: Fujian Province, Wuyishan City , Wuyishan Nature Reserve , Dazhulan , July 24, 2019, Yi-Fei Huang ; one female, China: Fujian Province, Wuyishan City , Wuyishan Nature Reserve , Guanping , July 22, 2019, Xiao-Han Ye .

Redescription of male ( Figs. 10–12 ). Body length 7.5 mm; body flat and narrow, brown to dark brown ( Fig. 10 ). Head dark brown, flat and with several long bristles, posterior margin slightly concave; compound eyes small, slightly protruded. Antennae pale brown, slender and hairy, with 20 to 25 segments; basal segment dark brown, rod-like; segment 2 short; segment 3 longer than segment 4; other segments cylindrical, long and thin. Pronotum longer than wide, anterior fourth trapezoidal, posterior margin truncate. Elytra well-developed, length three times longer than width, with small punctations and parallel lateral margins; hind wings well-developed, posterior margin truncate. Legs short, pale brown; femur, tibia and basal tarsal segment with several spines. Abdomen long and flat, lateral margins arc-shaped. Last dorsal segment wider than long, surface flat and pale ( Fig. 11 ). Subgenital plate with circular posterior margin, posteromedial margin slightly notched. Pygidium subtriangular, short and wide, posterior margin dentate. Forceps length about 1.0 mm, with a broad inner space, basal two-thirds thick and straight; basal third with a lateral patch of short bristles and a large inner tooth; apical third strongly curved inwards ( Fig. 11 ). Genitalia ( Fig. 12 ) slender, paramere finger-shaped, widened subapically, apex truncate and covered with small granules; penis lobe divided into two unequal finger-shaped parts, both shorter than paramere.

Redescription of female ( Figs. 13–14 ). Generally similar to male ( Fig. 13 ). Last dorsal segment ( Fig. 14 ) gradually narrowed to posterior margin, posterolaterally with two pyramid-shaped projections. Pygidium near-rectangular, posteromedial margin slightly concave. Forceps length ( Fig. 14 ) 2.0 mm, mostly straight, basal half with several continuous teeth on inner margin and several long bristles on outer margin; medial third of forceps with flattened inner margin apical to large tooth; apex of forceps strongly curved inwards and with a long bristle on outer margin.

Remarks. In China, P. major was previously known only from Guangxi, Yunnan and Hainan provinces in southern China ( Chen & Ma 2004, Hopkins et al. 2020). We obtained new specimens of this species from Guangdong and Fujian provinces thus, extending its distribution eastwards and slightly northwards ( Fig. 15 ). This species is expected to be found in other provinces of southern China, such as Hunan and Jiangxi provinces.

Figures

FIGURE 10. Platylabia major Dohrn, 1867, male habitus. A. Dorsal view; B. Ventral view. Scale bar = 1 mm.

FIGURE 11. Platylabia major Dohrn, 1867, male terminalia. A. Dorsal view. B. Ventral view. Scale bar = 1 mm.

FIGURE 12. Platylabia major Dohrn, 1867.A. Male genitalia, ventral view. B. Apex of male genitalia, ventral view. Scale bars = 0.1 mm.

FIGURE 13. Platylabia major Dohrn, 1867, female habitus. A. Dorsal view. B. Ventral view. Scale bar = 1 mm.

FIGURE 14. Platylabia major Dohrn, 1867, female terminalia. A. Dorsal view. B. female terminalia, ventral view. Scale bar = 1 mm.

FIGURE 15. Known distribution of Platylabia major Dohrn, 1867 in China. Previously known distribution range indicated by blue; new distribution ranges indicated by red.