中文摘要：

对寄生于大亚湾黑鲷（Acanthopagrus schlegeli）体表的鲷无胄虫（Anoplodiscus spari）进行了形态描述, 并扩增了该虫的28S rDNA C1-D2区部分序列, 构建了相关类群的分子系统树, 探讨了无胄虫科的分类地位.结果显示： 所获标本与Ogawa等的描述基本-致, 但交接管基部及末端位置略有不同： 本研究标本的交接管基部始于支持器的下方、末端于支持器三分叉的中支略伸出, 而Ogawa等的标本交接管基部靠近支持器三叉处、末端从三叉处延伸并略弯曲; 无胄虫属（Anoplodiscus）为单系起源, 隶属于指环虫目、四钩虫亚目、无胄虫科（Anoplodiscidae）, 无胄虫科是-独立的科, 在分类地位上与四钩虫科（Tetraonchidae）互为姐妹群, 与Udonellidae科和微沟科（Microbothriidae）的关系较远.

英文摘要：

The current study described the whole worm and male copulatory organ of Anoplodicus spari collected fromAcanthopagrus schlegeli off Daya Bay, South China Sea. Our specimens of Anoplodicus spari from South China Seawas basically consistent with the description of Ogawa et al. （1981） except for the slight difference in the position ofthe base and distal end of copulatory tube. The proximal end of the copulatory tube lied beneath the accessory piece andthe distal end protruded from the three rami in our specimens, while the distal end extended from the rami and curved inthe specimen of Ogawa （1981）. The partial 28S rDNA sequences （C1-D2 domain） of Anoplodicus spari and other re-lated groups were used to study the taxonomic position of Anoplodiscidae. The results showed the independent posi-tion of Anoplodiscidae, a valid family belonging to the clade of Tetraonchinea, Dactylogyridea. Anoplodiscidae andTetraonchidae were a sister group in the phylogenetic tree, and this clade was distantly different from Udonellidae andMicrobothriidae.