First report of Epistylis unioi Gong 1986 (Sessilida: Epistylididae) infecting fry of Pelteobagrus fulvidraco in Hubei, China
First report of Epistylis unioi Gong 1986 (Sessilida: Epistylididae) infecting fry of Pelteobagrus fulvidraco in Hubei, China
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DOI：
10.11646/zootaxa.3556.1.5
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发表时间：
2012-11
期刊：
影响因子：
0.9
通讯作者：
Ming Li;Weidong Li;X. Ge;Chong Wang;Lin Zhang;Feng Huang;Huiyu Liu
中科院分区：
文献类型：
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作者：
Ming Li;Weidong Li;X. Ge;Chong Wang;Lin Zhang;Feng Huang;Huiyu Liu
2010年5月，在中国中部湖北省红鼓湖鱼类孵化场进行寄生虫调查时，从黄颡鱼鱼苗中采集了周毛Epistylis unioi Gang, 1986，并进行了重新描述。一些修改是基于活体、浸银和 SEM 样本进行的。动物体是细长的，形状有点像花瓶，体内尺寸为 56–88 × 22–38 µm。单个收缩液泡位于唇盘稍下方的顶部。大核呈马蹄形，总是横向位于体的前侧。单动力 (H) 和多动力 (Po) 在进入漏斗部之前在唇上完成一圈二分之一，并在远端存在远端运动片段。银线系统由口唇和口套间带（TB）之间的 37-45 条薄膜条纹组成，以及 TB 和勺骨之间的 26-33 条薄膜条纹组成。菌落呈不对称二叉分枝，通常只有两级分枝。此外，还观察到了E. unioi的端毛虫，并对其结构进行了描述。此外，还发现了E. unioi的环状基部引起的明显的皮肤损伤，并简要讨论了这些寄生虫与其宿主之间的关系。
The peritrich Epistylis unioi Gong, 1986 was collected from fry of Pelteobagrus fulvidraco during parasite surveys at Hon-ghu Lake Fish Hatchery, Hubei Province, central China in May 2010 and redescribed. Some revisions were done basedon live, silver-impregnated, and SEM specimens. The zooid is elongated and somewhat vase-like in shape, measuring56–88 × 22–38 µm in vivo. A single contractile vacuole is apically located slightly below the peristome disc. The macro-nucleus is horseshoe-shaped, always transversely situated at the foreside of the body. Haplokinety (H) and polykinety (Po)complete one and one-half circuits on the peristome before entering the infundibulum, with a distal kinetal fragment pres-ent at the distal end. Silverline system consists of 37–45 pellicular striations between peristome and aboral trochal band(TB), and of 26–33 between TB and scopula. Colony is asymmetrically and dichotomously branched, usually with onlytwo levels of branches. In addition, the telotrochs of E. unioi were also observed and its structures were described herein.Besides, obvious skin lesions caused by the ringlike base of E. unioi were detected and the relationship between these epizooites and their hosts was briefly discussed as well.