中国水螅属一新种(水螅纲,水螅科)

报道采自广东省肇庆市的淡水水螅1新种,多形水螅Hydra polymorphus sp.nov.,研究标本均来自1只水螅的单系繁殖群体,测量数据经生物统计学处理。新种的钩刺丝囊外形及内部刺丝盘旋均有多种形态,故新种名以此命名。所有研究标本保存于深圳大学生命科学学院。

A NEW SPECIES OF THE GENUS HYDRA FROM CHINA (HYDROZOA, HYDRARIDAE)

A new species of freshwater polyp collected from Zhaoqing City Guangdong Province was described,and was named as Hydra polymorphus sp.nov.The new species was a hermaphroditic polyp.It was similar to Hydra carnea(Hyman,1931a)and Hydra sp.(Campbell,1999),but many distinctions among them were still detected(Table 2).1)The new species' Tentacle /body was 5.5-6.0,while Hydra carnea's was only 1.5-3.0,Hydra sp.was only 1/3-1/2;2)the body length of Hydra polymorphus sp.nov.was 9(8-14)mm,while the body length of Hydra sp.(Campbell,1999)was 3-5 mm;3)the new species formed 1-7 unpapillang blunt cone-shaped testes and 1-6 eggs,while the Hydra carnea have a papillary shape.Holotype 20(hermaphroditic),Zhaoqing City(23.2085 N,112.5681 E),Guangdong Province,China,July 2007,collected by CHEN Zhong-Zhao.The type specimen is deposited in the laboratory of College of Life Sciences,Shenzhen University.