黄海自由生活线虫两个新纪录种描述

Descriptions of two newly recorded free-living marine nematode species isolated from the Yellow Sea

作者以山东烟台养马岛采集的未受扰动的样品为研究材料,对中国黄海潮间带自由生活线虫的种类和多样性展开研究,发现两个新纪录种八棘单茎线虫(Monoposthia octalata Galtsova,1976)和瑞氏拟单宫线虫(Paramonohystera riemanni(Platt,1973)Lorenzen,1977)并进行描述。八棘单茎线虫主要特征为体表具有八排侧装饰,化感器呈圆形、较小,口腔具有一个大的背齿,口腔前端具有明显角质化波浪形的结构,无交接刺,引带作镰刀状,尾呈锥状。标本特征与Galtsova描述的模式标本特征基本吻合,只是黄海的标本虫体稍长,化感器略大,引带稍长。瑞氏拟单宫线虫主要特征为虫体较细,头刚毛短,化感器呈圆形位于口腔后部,口腔内不具齿,交接刺稍弯曲,为对应体径的4.1倍,引带简单,尾细长呈纤毛状。标本特征与Platt描述的模式标本特征基本吻合,只是黄海的标本虫体稍长,头刚毛和尾部更长,交接刺略长。

To investigate the diversity of free-living nematodes in the intertidal zone of the Yellow Sea,undisturbed samples collected from Yangma Island in Yantai,Shandong Province,were studied.Two newly recorded species of free-living marine nematode,Monoposthia octalata Galtsova,1976 and Paramonohystera riemanni(Platt,1973)Lorenzen,1977,have been described in this study.M.octalata is characterized by the presence of eight longitudinal rays,small amphids foveal,a buccal cavity with one dorsal tooth,a sickle-shaped gubernaculum,and a tail cone and the absence of spicules.The studied specimens matched well with the original description of Galtsova,except the specimens had a slightly longer body,slightly bigger amphids,and longer gubernaculum.P.riemanni is characterized by the presence of a slender body,short cephalic setae,buccal cavity without teeth,circular amphids foveal positioned at the posterior end of the buccal cavity,slightly curved spicules that were 4.1 times the corresponding body diameter,simple gubernaculum,and a long tail,and they were slightly filiformed.The characteristics of the specimen agreed well with the original description of Platt,except its body and spicules were slightly longer,and cephalic setae and tail were considerably longer.