A Synopsis Of Styloperlidae (Insecta, Plecoptera) With Description Of Cerconychia Sapa, A New Stonefly From Vietnam Author Stark, Bill P. and Ignac Sivec & Box 4045, Department of Biology, Mississippi College, Clinton, Mississippi, U. S. A. 39058 E-mail: stark @ mc. edu stark@mc.edu Author Sivec, Ignac Slovenian Museum of Natural History, Prešernova 20, P. O. Box 290, SLO- 1001 Ljubljana, Slovenia E-mail: isivec @ pms-lj. si isivec@pms-lj.si text Illiesia 2007 2007-07-04 3 2 10 16 journal article http://doi.org/10.5281/zenodo.4758631 815a5e02-f400-4784-a998-fa60d699a71b 1854-0392 4758631 Cerconychia Klapálek, 1913 Cerconychia was proposed by Klapálek (1913) for C. brunnea and C. livida , a closely related pair of Taiwanese species. These remained poorly known until Uchida & Isobe (1989) designated male lectotypes and provided comprehensive redescriptions for both species. Included in the Uchida & Isobe (1989) study was the first nymphal description for a species placed in the Styloperlidae . The genus, as currently defined, is distinguished from Styloperla on the basis of a transversely oriented hair brush on male sternum 9, the absence of vaginal sclerites, and a parabolic, lightly sclerotized projection on the apex of male tergum 10. The latter structure is considered a rudimentary epiproct and is flanked basally by a pair of rudimentary hemiterga ( Uchida & Isobe 1989 ). In addition to the Taiwanese species, Yang & Yang (1995) described C. sinensis from a small sample collected at Jianfengling on Hainan Island