中国淡水水母一新种(淡水水母目:笠水母科)

A NEW SPECIES OF FRESHWATER MEDUSA FROM CHINA (LIMNOMEDUSAE:OLINDIDAE)

1993年 4月 2日在湖北省秭归县归州镇采得淡水水母标本 19个 ,形态结构与Craspedacus tasinensis相似 ,但刺丝囊疣低圆锥状 ,排列不规则 ,生殖腺囊状 ,大 ,褶皱 ,绿色 ,这些特征与C .

This paper deal with a new species of the genus Craspedacusta. The type specimens are deposited in the College of Life Science, Henan Normal University.Craspedacusta brevinema sp. nov.\ (Fig.1) On 2 Apr. 1993, holotype 1, paratype 18 were collected from two pools around the Yangtse River in Guizhou Town, Zigui County (31°N,110°40′E), Hubei Province.Umbrella lower than a hemishere, 7-15*!mm in diameter. Velum narrow, about 1/5 of the diameter of umbrella. Marginal tentacles are short, thick and arranged irregularly in four order, giving a total number of 145-400. Perradial tentacles four, not longer than other tentacles, about 1/3 of the diameter of umberlla. Stomach large, manubrium long, with four large lips, extending beyond the umbrella margin.Nematocyst warts on the tentacles arranged irregularly, but without warts at 1/4 of oral surface. Nematocyst warts is lower conical in shape, each containing 5-8 nematocysts. Four gonads larger, pocket-like, twisted, and green in color when living. Statocysts tubular, 92-158 in number.The new species is distinguished from Craspedacusta sinensis by the following characters: nematocyst warts lower conical; gonads large, twisted, green in color.