A new species, Skrjabinopsolus nudidorsalis sp. nov. is described from the sterlet Acipenser ruthenus, caught in the River Volga basin (Russia). This species differs from previously described congeners by the absence of vitelline follicles on the dorsal side of the body. The complete 18S rRNA and partial 28S rRNA gene sequences obtained for S. nudidorsalis are the first molecular data for the family Deropristidae. The results of phylogenetic analysis indicate that Deropristidae is sister to the Monorchiidae + Lissorchiidae group. The results of the phylogenetic study contradict the current taxonomic hypothesis that Deropristidae belongs to the superfamily Lepocreadioidea and allow inclusion of this family in Monorchioidea. The morphological similarity of deropristids to other monorchioids is recognizable from the presence of a bipartite internal seminal vesicle, spinous cirrus and a voluminous, armed metraterm.

中文翻译：

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来自小sterAthecener ruthenus（Actinopterygii：Acipenseridae）的一种新的灭足纲吸虫线虫和Deropristidae科的超家族隶属关系的修订

一个新种，Skrjabinopsolus nudidorsalis sp。十一月是从伏加河（俄罗斯）河中捕获的小ster Atheenser ruthenus描述的。该物种与先前描述的同类动物的不同之处在于，在身体的背面没有卵黄质卵泡。裸甲链球菌获得的完整18S rRNA和部分28S rRNA基因序列是兽脚亚科的第一个分子数据。系统发育分析的结果表明，兽足科是Monorchiidae + Lissorchiidae组的姐妹。系统发育研究的结果与当前的分类学假设相矛盾，即拟兽科属于Lepocreadioidea超科，并允许将该科包括在Monorchioidea中。可以从两性内部精囊，棘状的卷状和大量的，