Isoperla ordosi Wu, 1938

Chen, Zhi-Teng, Song, Liang-Dong & Feng, Wen-Tao, 2019, A new species of Isoperla (Plecoptera: Perlodidae) from the Qinling Mountains of northwestern China and notes on the Chinese species of the genus, Zootaxa 4651 (2), pp. 379-391 : 384

Isoperla ordosi Wu, 1938

Isoperla ordosi Wu, 1938a . Bull. Pek. Soc. Nat. Hist., 13(1): 57; Wu, 1938b. Plecopterorum Sinensium, a monograph of the stoneflies of China (Order Plecoptera ): 195; Claassen, 1940. Mem. Cornell agric. Exp. Sta., 232: 204; Illies, 1966. Das Tierreich, 82: 414.

Type information. Holotype male, China: Inner Mongolia, Alashan Eerduosi. 1919.VII.17.

Remarks. Only male of this species is known and is apparently characterized by a posteromedially projecting terga 8–10, paired triangular patches of spines on tergum 9, long triangular and hooked paraprocts, and a well-de- veloped, recessed, moderately pedunculate vesicle ( Figs. 1 K–L; see figs. 286, 287 in Wu 1938a). Color pattern: head pale brown, ocelli with dark margins; pronotum pale brown, with very shallow rugose; legs yellowish brown; ventral surface of body pale brown ( Wu 1938a).

Figures

FIGURE 1. Drawings of older Isoperla species from China tracing original literature. A. I. bimaculata, female head and pronotum, dorsal view; B. I. bimaculata, female terminalia, ventral view; C. I. curvispina, male terminalia, dorsal view; D. I. curvispina, male terminalia, ventral view; E. I. curvispina, female terminalia, ventral view; F. I. fengi, female terminalia, ventral view; G. I. nanchana, male terminalia, ventral view; H. I. neimongolica, male head and pronotum; I. I. neimongolica, male terminalia, dorsal view; J. I. neimongolica, male terminalia, ventral view; K. I. ordosi, male terminalia, dorsal view; L. I. ordosi, male terminalia, ventral view; M. I. sowerbyi, female terminalia, ventral view; N. I. yangi, male terminalia, dorsal view; O. I. yangi, male terminalia, ventral view; P. I. yangi, female terminalia, ventral view.