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首页> 外文期刊>Journal of Parasitology >MORPHOLOGY MEETS MOLECULES: A NEW GENUS AND TWO NEW SPECIES OF DIPHYLLIDEAN CESTODES FROM THE YELLOWSPOTTED SKATE, LEUCORAJA WALLACEI, FROM SOUTH AFRICA
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MORPHOLOGY MEETS MOLECULES: A NEW GENUS AND TWO NEW SPECIES OF DIPHYLLIDEAN CESTODES FROM THE YELLOWSPOTTED SKATE, LEUCORAJA WALLACEI, FROM SOUTH AFRICA

机译：形态学与分子相遇：来自南非的黄斑溜冰者Leucoraja Wallacei的双歧类的一个新属和两个新种

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摘要

Two morphologically disparate undescribed species of diphyllidean cestodes from the Yellowspotted skate, Leucoraja wallacei, from South Africa were included in a recent molecular phylogenetic study aimed at revising diphyllidean classification. From a molecular standpoint, these species were determined to be only distantly related to one another. One (originally referred to as Echinobothrium n. sp. 2) showed affinities with species of the batoid-parasitizing Echinobothrium sensu stricto and is described here as Echinobothrium marquesi n. sp. This species most closely resembles Echinobothrium joshuai, an affinity supported by the previous molecular study, but differs in the form of its "B'' hooks and degree of overlap between bothria and cephalic peduncle. The other species (originally referred to as New genus n. sp. 1), although exhibiting the full complement of scolex armature, grouped among primarily shark-hosted genera, most of which lack or exhibit reduced scolex armatures. That unexpected result suggested that erection of a novel genus might be warranted, but morphological grounds supporting the action were not apparent at that time. The present study aimed to explore the morphology of this taxon in more detail. Light and scanning electron microscopy revealed this taxon to be exceptional in that its lateral hooklets, which are arranged in 2 clusters like those of Echinobothrium and Coronocestus, are unique in being arranged in anterior and posterior rows, rather than in a single row. Andocadoncum n. gen. is erected, with Andocadoncum meganae n. sp. as its type, to accommodate this taxon. A minor adjustment to the existing hook formula by presenting counts for the anterior hooklets (a) separately from the posterior hooklets (b) readily accommodates this new form. Leucoraja wallacei is distinctive among skates in hosting 2 different genera of diphyllideans. In the context of the previous molecular phylogenetic analyses, it appears that the presence of Andocadoncum n. gen. in this skate species may be the result of a host-switching event involving a weakly or unarmed shark-hosted taxon moving to a batoid-a shift that was likely accompanied by a return to the fully armed condition seen, for example, in other batoid-parasitizing members of the order.
机译：来自南非的黄斑溜冰者Leucoraja wallacei的两个形态学上不同的双壳类硬鳞动物被包括在最近的旨在修订双壳类植物分类的分子系统发育研究中。从分子的角度来看，这些物种被确定为仅彼此遥远相关。一种（原称为棘孢棘孢菌（Echinobothrium n.sp.）2）显示出与寄生于巴氏杆菌的种紧密结合的棘孢棘孢棘孢菌（Echinobothrium sensu stricto）的亲和力，在本文中被描述为棘棘棘棘孢菌。 sp。该物种最接近于先前的分子研究所支持的棘轮棘thr虫，但其“ B”形钩子的形式以及两头和头状花序梗之间的重叠程度有所不同。其他物种（最初称为新属n （sp。1），虽然表现出完整的scolex电枢，但在主要由鲨鱼寄主的属中分组，其中大多数缺乏或显示减少的scolex电枢。这一出乎意料的结果表明，可能有必要建立一个新的属，但从形态上讲当时尚不支持这种作用，本研究旨在更详细地探索该分类单元的形态，光镜和扫描电子显微镜显示该分类单元的独特之处在于其侧钩状结构，它们像2个簇一样排列Echinobothrium和Coronocestus的独特之处在于排列在前排和后排，而不是单排。菊科植物Andocadoncum meganae。 sp。作为其类型，以适应此分类单元。通过将前钩子（a）的数量与后钩子（b）分开显示，对现有钩子公式进行较小的调整即可轻松适应这种新形式。 Leucoraja wallacei在溜冰鞋中与众不同，可以容纳2个不同的Diphyllideans属。在先前的分子系统发育分析的背景下，似乎Andocadoncum n的存在。 gen。这种滑冰物种可能是宿主转移事件的结果，该事件涉及到弱弱或未武装的鲨鱼宿主类群转移到蝙蝠样生物—这种转变很可能伴随着完全武装状态的转变，例如在其他蝙蝠样生物中-将订单成员寄生化。

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