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Sivec I. 2005. Cryptoperla dui, sp. n., a new stonefly from South China (Plecoptera: Peltoperlidae). Illiesia, 1(2):8-9. Available online: http://www2.pms-lj.si/illiesia/papers.html
CRYPTOPERLA DUI, SP. N., A NEW STONEFLY FROM SOUTH CHINA (PLECOPTERA: PELTOPERLIDAE)
Ignac Sivec
Slovenian Museum of Natural History, Prešernova 20, P.O. Box 290, SLO-1001 Ljubljana, Slovenia
E-mail: isivec@pms-lj.si
ABSTRACT
Cryptoperla dui, s p . n. is de sc r i bed from m a le s p ecim en s t ake n i n Sic h uan , a nd Yu nn an p r o v in ce s , Ch ina. Th e new species is superficially similar to C. bisaeta (Kawai) and C. kali Stark but may not be phylogenetically close to either.
Keywords: Plecoptera, China, Cryptoperla, new species
INTRODUCTION
Despite the work of Uchida & Isobe (1988), Stark (1989) and Sivec (1995), Cryptoperla continues to be a perplexing group of Oriental and eastern Palearctic stoneflies. Presently the group remains a small one with about 20 recognized species but the variety of cercal modifications documented for the group continues to grow. In the present study another general modification, that of multiple polyp shaped, spine-bearing processes is documented for a species found in several localities in south China. I take great pleasure in naming this species for my colleague, Prof. Du Yuzhou, in recognition of his numerous contributions to the knowledge of Chinese stoneflies.
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.
ACKNOWLEDGEMENTS
I would like to thank Mr. Yao Jian, Institut of Zoology, Chinese Academy of Sciences, Beijing, and Ulrike Aspoeck, Naturhistorisches Museum Wien for the loan of specimens. Bill Stark is thanked for the linguistic help.
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Sivec I. 2005. Cryptoperla dui, sp. n., a new stonefly from South China (Plecoptera: Peltoperlidae). Illiesia, 1(2):8-9. Available online: http://www2.pms-lj.si/illiesia/papers.html
Figs. 1-3. Cryptoperla dui. 1. Male terminalia, dorsal. 2. Male terminalia, ventral. 3. Male cercus.
REFERENCES
Kawai, T. 1968. Stoneflies (Plecoptera) from Thailand
and India with descriptions of one new genus and
two new species. Oriental Insects, 2:107-139. Sivec, I. 1995. Cryptoperla fujianica spec. nov., and
Cryptoperla    stilifera    spec.    nov.,    two    new
Peltoperlidae    species    from    Fujian,    China
(Plecoptera). Opus. Zool. Flumin., 132:1-5. Stark, B. P. 1989. Oriental Peltoperlidae (Plecoptera):
A generic review and descriptions of a new genus
and seven new species. Ent. Scand., 19:503-525 Uchida, S. & Y. Isobe 1988. Cryptoperla and Yoraperla
from      Japan     and      Taiwan      (Plecoptera:
Peltoperlidae). Aquatic Insects, 10:17-31.
Received 20 November 2004, Accepted 20 December 2004, Published 26 January 2005
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