海洋纤毛虫一新种——对虾聚缩虫

A NEW MARINE CILIATE, ZQOTHAMNIUM PEN AEI SP. NOV. (CILIOPHORA, PERITRICHIDA)

于1989年对采自江苏赣榆青浦养殖场对虾体表的纤毛虫研究中,发现一大型共栖种,经鉴定系一新种,定名为对虾聚缩虫Zoothamnium penaei nov. sp.。本种特征为:虫体呈罈状,具双层的口围缘,表膜无明显环纹而常为细菌及碎屑物所覆盖,群体中个员大小相差显著,柄为不规则对称式双叉形分枝。模式标本存放于青岛海洋大学水产学院动物室。

A new ectocommensal ciliate was found on the penaeid shrimp Penaeus oriemalis collected along Jiangsu coast in the Yellow Sea in September 1989. The infraciliature and silverline system were studied with protargol and dry silver impregnation methods and described. The characteristics of the new species are given below:Zoothamnium penaei sp. nov. (Figs. 1-3; Tab. 1)Type location: Shrimp farming pond, anyu County, Jiangsu Province.Habitat: oligosaprobic; Water temperature 27-31℃; pH 8.0-8.2; Salinity 1-5.Type specimens: deposited in College of Fisheries, Ocean University of Qingdao.Diagnosis: Body more or less globular, 2 layer peristomial border rather thick. Pellicle finely striated, in vivo almost irrecognizable, often attached by numerous bacteria and other organic detritus. Endoplasma colurless or slightly greyish. Contractile vacuole large, apical in position. Macronucleus moderately thick, C-shaped and transversely located. Swarmer Flat disc like. Colony large, often with more than 100 individuals; stalk smooth, dicho-tomus branched. Large zooids (macrozooids ?) about twice as long as small ones (microzooi-ds ?).Compared with the other similar species, e.g. Z. duplicatum, Z. maximum and Z. hadzii, the new species can be distinguished by its different colonial type, body shape and number of silverline, moreover, there is no differentiation of large and small zooids in the other species.