中国水螅属一新种(螅形目,水螅科)  

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

作　　者：范学铭[1] 

机构地区：[1]哈尔滨师范大学生命与环境科学学院生物学系,哈尔滨150080

出　　处：《动物分类学报》2003年第3期438-441,共4页Acta Zootaxonomica Sinica

基　　金：黑龙江省自然科学基金;蔡火石生命科学基金联合资助项目

摘　　要：记述采自北京地区水螅属 1新种 :北京水螅Hydrabeijingensissp .nov .。新种的主要鉴别特征是出现体部与柄的分化 ;钩刺丝囊内刺丝缠绕具有 2种形态 :大部分钩刺丝囊 (占 2 /3左右 )内顶端基部刺丝呈 4～ 5圈横向弹簧状缠绕 ,而占所观察刺丝囊总数 1/3左右的囊内刺丝为不规则缠绕和纵向缠绕。A new species Hydra beijingensis sp. nov. collected from Beijing is described. Body of medium size.It is dioecious.The new species is similar in some ways to Hydra daqingensis (Fan, 2000), but there are essential distinctions. The characters of the new species are: there is differentiation on body and stalk in external diameter.Two forms of holotrichous isorhiza threads: most arranged in 4-5 transverse coils, and the other extreme examples are found, in which the whole thread is wound irregularly or predominantly longitudinally. The number of developing eggs are 2-4 only. Under warmer temperature conditions (28.0-33.0℃) the new species produces testes and ovaries. Holotype, paratypes 28♀♀,19, Capital Normal University (39°90′N,116°39′ E),21 Oct. 1999; and Paratypes 13♀♀,8, Zizhuyuan Park (39°90′ N,116°39′ E), 29 May 2002, Beijing City, collected by FAN Xue-Ming. The type specimen is deposited in the Laboratory of Invertebrate Zoology in the Department of Biology in College of Life and Environment Science in Harbin Normal University.

关 键 词：中国 水螅属 新种 螅形目 水螅科 

分 类 号：Q959[生物学—动物学]