Faliex E, Tyler G, Euzet L
Laboratoire de Biologie Animale, UMR 5555 du CNRS, CBETM, Université de Perpignan, France.
J Parasitol. 2000 Oct;86(5):1078-84. doi: 10.1645/0022-3395(2000)086[1078:ANSODC]2.0.CO;2.
Ditrachybothridium piliformis is a new species from the spiral intestine of a cat shark, Galeus sp., from the southern Pacific Ocean. This is only the second species assigned to Ditrachybothridium. It differs from the type species D. macrocephalum in lacking spines on the scolex, a character originally used to diagnose the genus. The diagnoses of the Ditrachybothridiidae and of Ditrachybothridium have been revised to reflect this difference. This new species is further differentiated from the type species in its possession of pectinate spinitriches on the tegument of the scolex. The holdfast structures of this species are weakly muscularized, with no membrane-bound layer of radial muscles, indicating that the holdfast structures are bothria rather than bothridia as described in the most recent literature. Several reports for other species have indicated the same situation in other diphyllideans. The diagnosis of the order has been revised to reflect this finding.
丝状双槽绦虫是一种来自南太平洋猫鲨（Galeus sp.）螺旋肠的新物种。这是归入双槽绦虫属的第二个物种。它与模式种巨头双槽绦虫的不同之处在于，其头节上没有棘，而这一特征最初被用于诊断该属。双槽绦虫科和双槽绦虫属的诊断已作修订以反映这一差异。这个新物种与模式种的进一步区别在于，其头节体表有栉状棘毛。该物种的固着结构肌肉化程度较弱，没有膜结合的放射状肌肉层，这表明固着结构是吸沟而非最新文献中描述的吸叶。其他物种的几份报告表明，在其他双叶目绦虫中也存在同样的情况。该目的诊断已作修订以反映这一发现。
