中国水螅属一新种(水螅纲,水螅科)

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

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 freshwater polyp collected from Zhaocling City Guangdong Province was described, and was named as Hydra polymorphus sp. nov. The new species was a hermaphroditic polyp. It was simailar 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.