Cryptoperla dui, Sivec, 2005

Sivec, Ignac, 2005, Cryptoperla Dui, Sp. N., A New Stonefly From South China (Plecoptera: Peltoperlidae), Illiesia 1 (2), pp. 8-9 : 8

Cryptoperla dui , sp. n. ( Figs. 1-3 )

Types. Holotype ♂ from Sichung Wenchung , 2500- 3000 m, 6. VII. 1983, Sichuan, China, deposited in the Institute of Zoology, Academia Sinica, Beijing . Paratype: China: Yunnan, Handel-Mazzetti , 1 ♂ (Naturhistorisches Museum, Wien) .

Male. Forewing length 11 mm. General color brown without distinctive pattern. Ocelli small, widely spaced, nearer compound eyes than to each other. Posterior margin of tergum 10 projects between cercal bases, somewhat triangular in outline ( Fig. 1 ). Basal cercal segment 5-6 times long as wide and rather densely fringed primarily along apical half of inner margins with long setae; basal segment modified at tip, bearing several small polyp shaped structures which appear as malformed partial segments; each polyp bears a tuft of close set thickened setae set in a short row ( Fig. 3 ). Vesicle more than twice as wide as long ( Fig. 2 ).

Female. Unknown.

Larva. Unknown.

Diagnosis. In Stark (1989) this species will key to couplet 8 where an impasse occurs and the species cannot be satisfactorily assigned to C. bisaeta (Kawai) ( Kawai 1968) or C. kali Stark ( Stark 1989) . The cerci of males of this species is at least superficially similar to that of C. bisaeta , however in that species there is a single long slender polyp which bears a tuft of long thin setae. There is also a general similarity with C. kali but again the cerci have only one modified process and this bears a single seta. In addition, C. kali males have a very narrow vesicle.

Etymology. The patronym honors Prof. Du Yuzhou.

Figures

Figs. 1-3. Cryptoperla dui. 1. Male terminalia, dorsal. 2. Male terminalia, ventral. 3. Male cercus.