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 Styloperla Wu, 1935 Wu (1935) proposed Styloperla for S. spinicercia but the holotype is missing ( Uchida & Isobe 1989 ) and paratype specimens retained in China were also apparently destroyed, consequently this species is known from the figures and descriptions provided by Wu (1935 , 1938 ). Chao (1947) added S. inae and S. wui from Fujian Province and these were redescribed by Uchida & Isobe (1989) . These authors also transferred two species, Cerconychia flectospina ( Wu 1962 ) and Nogiperla obtusispina ( Wu 1973 ) to the genus. Subsequently, Yang & Yang (1990) described S. jiangxiensis . Males of the genus are distinguished from those of Cerconychia by a longitudinally oriented hair brush on sternum 9 and females by the presence of vaginal sclerites.