Rho Hyun Soo, Decraemer Wilfrida, Sørensen Martin Vinther, Min Won Gi, Jung Jongwoo, Kim Won
East Sea Research Institute, Korean Ocean Research & Development Institute, Uljin 695-1, Korea.
Zoolog Sci. 2011 Jan;28(1):68-84. doi: 10.2108/zsj.28.68.
A new genus and species of Draconematidae Filipjev, 1918, Megadraconema cornutum gen. nov., sp. nov., inhabiting subtidal sediments in Jejudo, Korea is described. Megadraconema cornutum gen. nov., sp. nov. is mainly characterized by a long body (1630-2220 µm), presence of a transverse circle of well-developed papillae-like cuticular protrusions at the base of the lip region, a head capsule with reticular structure of subcuticle, an amphid with a pore-like opening, and an internal, bar-shaped fovea. The diagnosis of the family Draconematidae is emended and a key to genus is provided based on their major differential diagnostic characteristics, summarized in a table. Phylogenetic relationships of all the genera within the Draconematidae are discussed for the first time, based on molecular analyses and morphological features. The phylogenetic position of the new genus and relationships within the family Draconematidae based on analysis of molecular sequence data are examined. Analysis of 18S rRNA gene sequences does not support the currently accepted classification, and indicates paraphyly of the subfamily Draconematinae.
描述了一种新的龙线虫科（Draconematidae Filipjev，1918）属和种——角巨龙线虫（Megadraconema cornutum gen. nov., sp. nov.），其栖息于韩国济州岛的潮下带沉积物中。角巨龙线虫主要特征为身体较长（1630 - 2220微米），在唇部区域基部有一圈发育良好的乳头状角质突起的横向环，具有皮下网状结构的头壳，有孔状开口的双宫，以及内部的棒状凹窝。修订了龙线虫科的诊断，并根据其主要鉴别诊断特征提供了属的检索表，这些特征总结在一个表格中。首次基于分子分析和形态特征讨论了龙线虫科内所有属的系统发育关系。研究了基于分子序列数据分析的新属在龙线虫科内的系统发育位置和关系。18S rRNA基因序列分析不支持目前接受的分类，并表明龙线虫亚科为并系群。
