Koubková Bozena, Barus Vlastimil, Hodová Iveta, Simková Andrea
Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlárská 2, 611 37 Brno, Czech Republic.
Parasitol Res. 2008 Apr;102(5):1013-20. doi: 10.1007/s00436-007-0869-0. Epub 2008 Jan 24.
Numerous nematodes were found in the rectum of three fish species Synodontis ocellifer, S. nigrita, and S. schall (Mochokidae, Siluriformes) from the Gambia River and Mare Simenti, National Park Niokolo Koba, Senegal. A nematode species Raillietnema synodontisi Vassiliadès, 1973 (host S. ocellifer), is redescribed using morphometric (including scanning electron microscopy) and molecular characteristics and transferred into the genus Labeonema Puylaert, 1970. It is morphologically and metrically similar to Labeonema intermedium Puylaert, 1970, the other congeneric species (L. bainae Baker, 1982; L. bakeri Van Waerebeke, Chabaud, Bain et Georges, 1988; and L. africanum Moravec et Van As, 2004) differ from them either by the spicule and gubernaculum lengths, distribution and number of pre-cloacal papillae, position of the vulva, as well as hosts and geographical distribution. The partial sequences of small ribosomal subunit rDNA of L. synodontisi were analyzed and compared with other nematode sequences. Molecular analyses seem to support the position of this nematode species based on the morphological observation.
在来自塞内加尔尼奥科洛科巴国家公园冈比亚河和马雷西米滕的三种鱼类——眼斑歧须鮠（Synodontis ocellifer）、黑歧须鮠（S. nigrita）和沙氏歧须鮠（S. schall，鲇形目双背鳍鲿科）的直肠中发现了大量线虫。对一种线虫物种——1973年的眼斑歧须鮠雷氏线虫（Raillietnema synodontisi Vassiliadès，宿主为眼斑歧须鮠），利用形态测量学（包括扫描电子显微镜）和分子特征进行了重新描述，并将其转移到1970年的拉氏线虫属（Labeonema Puylaert）。它在形态和测量上与同属的另一个物种——1970年的中间拉氏线虫（Labeonema intermedium Puylaert）相似，而其他同属物种（1982年的拜氏拉氏线虫（L. bainae Baker）、1988年的贝氏拉氏线虫（L. bakeri Van Waerebeke, Chabaud, Bain et Georges）以及2004年的非洲拉氏线虫（L. africanum Moravec et Van As））在交合刺和引带长度、泄殖腔前乳突的分布和数量、阴门位置以及宿主和地理分布等方面与之不同。对眼斑歧须鮠拉氏线虫的小核糖体亚基rDNA的部分序列进行了分析，并与其他线虫序列进行了比较。分子分析似乎支持基于形态学观察所得出的该线虫物种的分类地位。
