斯库台涡虫属一新种(单肠目,斯库台科)及其分子系统学分析

摘要

This study reports a new species of Scutariellidae:Scutariella sinensis sp.nov.and related morphological description and phylogenetic analysis.Diagnoses of S.sinensis sp.nov.:(1) Two vitelline glands of S.sinensis sp.nov.are located at both sides dorsally alongside with the intestine and fused at posterior end of the intestine,which are U-shaped overall;(2) The genital opening of S.sinensis sp.nov.is located ventrally at the anterior end of the intestine;(3) The pharyngeal glands of S.sinensis sp.nov.are massive and located at both sides between the pharynx and the intestine;(4) The testes and ovaries of S.sinensis sp.nov.are situated ventrally at the anterior 1/3 intestine.Phylogenetic analysis was also conducted based on the 18S rDNA and 28S rDNA of S.sinensis sp.nov.,and thus provide the first molecular data of Scutariellidae to establish the classification of the new species in Temnocephalida and the evolutional relations with Trematoda.%本研究报道单肠目Rhabdocoela斯库台科Scutariellidae斯库台涡虫属Scutariella新种:中国斯库台涡虫,新种Scutariella sinensis sp.nov.,对其进行了形态学、分子系统学等研究.新种的主要鉴别特征:(1)二支卵黄腺在背部两侧沿肠管分布,在近肠后部愈合,整体呈“U”型;(2)生殖孔位于肠前端腹侧;(3)咽腺丰富,位于咽肠交界处的两侧;(4)精巢、卵巢位于肠道前1/3腹侧.新种的18S rDNA和28S rDNA分子系统发生研究首次提供了切头类斯库台科的分子数据,确定切头亚目Temnocephalida的分类地位及该亚目与吸虫类的进化关系.