中文摘要：

中山市位于珠江三角洲中南部,区内分布江河、溪流、水库、池塘等多种水体,迄今未见对该地区水栖寡毛类区系的研究报道。通过2005年6月和12月两次调查,记述中山市水栖寡毛类31种,隶属4科16属,包括1个国内新纪录种即扇形管盘虫（Aulophorus flabelliger）以及19个广东省新纪录种。区系分析表明,中山有较多的喜温种类。

英文摘要：

Zhongshan City,located in the delta of Pearl River in Guangdong Province,covers an area of 1 800 km2,with various water bodies including rivers,streams,reservoirs and ponds.Previously,the fauna of freshwater Oligochaeta in this area has not been studied.Based on the surveys in 16 water bodies conducted in June and December,2005,a total of 31 species（including 19 species new to Guangdong Province）of aquatic oligochaetes belonging to 16 genera and 4 families are recorded from Zhongshan City.Faunistic analysis has shown that Zhongshan area has more thermophilus species than northern areas of China.Aulophorus flabelliger of Naididae is recorded from China for the first time,and described as follows.Aulophorus flabelliger Stephenson,1931（Fig.2）Material：IHB GD2005006a-b,two whole-mounted specimens;IHB GD2005006c-d,two glycerine-mounted specimens;GD2005006e,one specimen in 10% formalin;all from plant roots in Beitaiyong stream（22°26＇29.7″N,113°22＇34.9″E）of Zhongshan in June,2005.The specimens are deposited in the Institute of Hydrobiology（IHB）,Chinese Academy of Sciences,in Wuhan,China.Description：Five complete preserved specimens about 3 mm long,0.18 mm wide,21-26 segments.Body was transparent.No eyes.Dorsal chaetae from VI onwards.1 hair per bundle,72-76 μm long.1 palmate needle per bundle,44-48 μm long,2.7-2.9 μm thick,with nodulus distal;teeth strongly diverging,maximally 12 μm wide,distal one 12 μm long and proximal 10 μm long,with web and 20-25 intermediate teeth.Ventral bifids of Ⅱ-Ⅴ 3-5 per bundle,90-102 μm long,2.4-2.5 μm thick,longer and thinner than the rest,with nodulus proximal;distal tooth 5.0 μm long and proximal 2.9 μm long.Those following 3-4 per bundle,44-52 μm long,1.9 μm thick,with nodulus distal;distal tooth much shorter and thinner than proximal（1.5 μm∶2.9 μm in length,0.7 μm∶2.1 μm in base thickness）.Branchial fossa with 3 pairs of long,cylindrical gills,and a pair of finger-like parallel palps.Portable tube about 4 mm long,0.24 mm wide,del