Two new species of Duplicibothrium Williams & Campbell, 1978 (Tetraphyllidea: Serendipidae) from the Pacific cownose ray Rhinoptera steindachneri
Two new species of Duplicibothrium Williams & Campbell, 1978 (Tetraphyllidea: Serendipidae) from the Pacific cownose ray Rhinoptera steindachneri
复制标题
Duplicibothrium Williams 的两个新种
作者：
T. Ruhnke;S. Curran;T. Holbert
四叶目两新种：双头绦虫Duplicibothriumcairae n. sp.和D.保伦;例如，描述于从加州海湾采集的太平洋牛鼻鳐Rhinoptera steindachneri。D.凯拉; sp.与该属已知的其它种D. minutum，在其拥有的两个后分叉的纵向隔膜上的每bothridium和具有更多的室每bothridium，更广泛的bothridia和更多的节每蠕虫。D.保伦; sp.与上述两个种的区别在于：短，每节上有两个连续的纵隔膜，而不是后部分叉或无纵隔膜，每节上有更多的室，每虫的节数较少。对Duplicibothrium属的诊断进行了修正，以反映两个新种的列入。双头绦虫的种类仅限于鼻翅目属的宿主种。从这两个新物种的研究中获得的系统信息支持单系的tetraphyllidean家庭Serendipidae，并建议Duplicibothrium共享的系统发育遗传与Glyphobothrium属和Serendip，分类群，也寄生在牛鼻射线的物种。Serendipid物种和Dioecotaenia物种之间的系统发育关系的证据进行了讨论，是潜在的软体动物宿主的绦虫物种Duplicibothrium和Dioecotaenia。
Two new tetraphyllidean species, Duplicibothrium cairae n. sp. and D. paulum n. sp., are described from Pacific cownose rays Rhinoptera steindachneri collected from the Gulf of California. D. cairae n. sp. differs from the only other known species in this genus, D. minutum, in its possession of two posteriorly bifurcating longitudinal septa on each bothridium and having a greater number of loculi per bothridium, wider bothridia and a greater number of segments per worm. D. paulum n. sp. differs from the above two species in being shorter, having two continuous longitudinal septa on each bothridium, rather than posteriorly bifurcating or absent longitudinal septa, having a greater number of loculi per bothridium and having fewer segments per worm. The generic diagnosis of Duplicibothrium is amended to reflect the inclusion of the two new species. Species of Duplicibothriumappear to be restricted to host species of the genus Rhinoptera. Systematic information gained from the study of these two new species supports the monophyly of the tetraphyllidean family Serendipidae and suggests that Duplicibothrium shares a phylogenetic heritage with species in the genera Glyphobothrium and Serendip, taxa that are also parasitic in cownose rays. Evidence for a phylogenetic relationship between serendipid species and species of Dioecotaenia is discussed, as are potential molluscan hosts for cestode species in Duplicibothrium and Dioecotaenia.