Neoperla bilineata Wu & Claassen, 1934

Li, Weihai, Wang, Ying & Wang, Rongfeng, 2017, Taxonomic notes on Neoperla (Plecoptera: Perlidae) from Sichuan Province of China with the description of two new species, Zootaxa 4221 (2), pp. 191-204 : 199

Neoperla bilineata Wu & Claassen, 1934

( Fig. 6 )

Neoperla bilineata Wu & Claassen, 1934: 120 . Type locality: Sichuan (Suifu).

Complementary description. Head and terminalia agree well with original description and illustrations ( Figs. 6 a & 6b). Aedeagus ( Figs. 6 c–e): Aedeagal tube straight, with usual basoventral and dorsal sclerites ( Figs. 6 c–d). Aedeagal sac membranous but with heavily sclerotized ventrolateral strip subapically ( Figs. 6 d & 6e). Sac about as long as tube and apical half slightly curved ventrally blunt angle to tube in ventral face ( Fig. 6 d); lateral surface of sac with a large patch of numerous small spines except dorsal surface at base and marginal area of apex ( Fig. 6 e); most are medium-sized spines with neighboring lateral patches of granules at subapical and basal areas ( Fig. 6 e).

Material examined. Holotype and 1 female paratype (with an allotype label) ( USNM), China: Szechuan, Suifu, (Sichuan, Yibin ) no date, D.C. Graham (Type No. 55238) . Paratypes: 2 males, China: Szechuan, Kwan-hsien ( Guanxian , now Dujiangyan ), 3000 feet, 1930. IV.5–V.8, D.C. Graham.

Diagnosis and remarks. The species is a member of the N. montivaga group and similar to N. nigromarginata Li and Zhang, 2014 , a species recently described from Henan Province, China. It is easily separated from that species by having a relatively straight aedeagal sac with swollen apex in male and an elongate, rod-like subgenital plate in the female ( Figs. 6 d–e, 7b). In N. nigromarginata Li and Zhang , the male aedeagal sac is curved ventrally nearly forming a right angle to tube, and the subgenital plate of female is very short forming a small dark tab (figs. 1f & 2b, Li and Zhang 2014).

Figures

FIGURE 6. Neoperla bilineata Wu & Claassen, 1934, male (a, d & e: holotype, b & c paratype). a. Head, dorsal view. b. Terminalia, dorsal view. c. Aedeagus before eversion, lateral view. d. Aedeagus, lateral view. e. Aedeagal sac, lateral view.