浙江淡水水母一新亚种永康桃花水母

A new subspecies of freshwater medusa from Zhejiang

2002年11月18日于浙江省永康市花街镇一池塘采得多个淡水水母标本。其触手伸展时呈细长线状,按其长短及着生位置分为6级。伞缘触手479～719条,平均608条。4条主辐触手不显著长于其它触手,长约为伞径的3/5;4个生殖腺褐黄色,着生在主辐管下方,呈光滑的三角扁囊状,向下有一细长的指状突起;平衡囊管状,数目为163～208个,平均183个;伞径大;触手数目、触手级数、平衡囊数目多,这些特征与桃花水母属已知种和亚种有明显区别,兹订为一新亚种,永康桃花水母(CraspedacustasowerbyiyongkangensisWangetXu,subsp.nov.)

The specimens were collected from a pool in Huajie town,Yongkang city(28°54′N,120°02′E),Zhejiang Province on November 18,2002. After a preliminary study, we consider that their marginal tentacles are longer,thin and arranged in six orders, giving a total number of 479-719,the average is 608. Perradial tentacles four ,not markedly longer than other tentacles,about 3/5 of the diameter of umbrella;Four gonads long-triangular,flattened pocket-like,smoothly,with a fingered projection beneath gonads,and brownish yellow in color when living;Statocysts tubular,163-208 in number,the average is 183;Large diameter of umbrella;More tentacles,more orders of tentacles and more statocysts. These characters of the new subspecies are distinguished from these species and subspecies we have known. The animal is identified as a new subspecies of Craspedacusta sowerbyi.