浙江产索氏桃花水母的形态学及参数分析

Morphological characters and their parameter analysis of Craspedacusta sowerbyi from Zhejiang Province

对采自杭州和绍兴的桃花水母进行形态学特征的观察和鉴定.标本的形态学鉴别特征为:触手分3级,主辐触手明显较其它触手长;刺丝囊疣乳突状,围绕触手呈螺旋形排列;平衡囊管状,生殖腺为长囊状.其形态鉴别特征与文献报道的索氏桃花水母的分类特征一致,故将杭州与绍兴产桃花水母订为索氏桃花水母.对杭州产索氏桃花水母的形态特征系统地进行数量统计与分析,发现水母伞径与缘膜宽度、平衡囊数和触手数之间均呈显著或极显著的线性正相关关系,而平衡囊数与触手数之间的相关性不显著;性别对桃花水母伞径大小与缘膜宽度无显著性影响.

According to the observation and identification of morphological characters of Craspedacusta sp. from Hangzhou and Shaoxing, the morphological identification characters of the species included that, the tentacles are divided into three orders and perradial tentacles are longer than others, nematocyst warts are papilla-shaped and have a spiral arrangement on the tentacle, statocysts are tubular and gonads are long pocket-like. These characters are mostly consistent with those of C. sowerbyi. So Craspedacusta sp. from Hangzhou and Shaoxing were identified as C. sowerbyi Lankester, 1880. The quantitative morphological characters of C. sowerbyi from Hangzhou were recorded and analyzed. According to the statistic results, there are significantly or most significantly in linear positive correlations between the diameter of umbrella and the width of velum, the number of statoeyst or the number of tentacle while the correlation between the number of statocyst and the number of tentacle is not significant. The sex of C. sowerbyi has no significant effects on the diameter of umbrella and the width of velum.