A redescription of Piguetiella denticulata Liang and Xie (Oligochaeta, Tubificidae, Naidinae) from China, with a key to the genus Piguetiella

摘要

Abstract.-Piguetiella denticulata Liang & Xie, 1997 is redescribed based on the type series collected from the type locality, Songtao River, and streams of the Zhangjiajie Mountain in southwestern China, and specimens from several tributaries of the Yangtze River. This species is characterized by a large body size, the absence of eyespots and dorsal hair chaetae, the same size and shape of dorsal and ventral chaetae, the presence of 3-4 intermediate teeth on both ventral and dorsal ehaetae, and an intestinal dilation in IX-X segments. The essential characteristics used to diagnose the genus are discussed and a key to the genus is provided.