Palaeospondylus as a primitive hagfish.
Palaeospondylus as a primitive hagfish.
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DOI：
10.1186/s40851-016-0057-0
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发表时间：
2016
影响因子：
2.7
通讯作者：
Kuratani S
中科院分区：
文献类型：
--
作者：
Hirasawa T;Oisi Y;Kuratani S
中泥盆世的类鱼动物古椎龙（Palaeospondylus）的分类地位仍然是个谜，主要是因为无法识别同源的头盖骨成分。这种动物已被归类为几乎所有的主要脊椎动物类群超过世纪的启发式分类学研究，尽管缺乏确凿的形态学证据。在这里，我们报告了八目鳗胚胎和古脊椎动物的第一次比较形态学分析，以及迄今为止被忽视的这些动物软骨颅成分的相似性;即，鼻被膜、脑颅和下颌弓源性软腭杆的排列一致。古椎龙的大型腹侧骨骼复合体被确定为圆口动物特有的舌器。更重要的是，古椎龙头骨的整体形态模式与颅面发育的圆口模式相吻合，而圆口模式与冠状颚口动物的圆口模式不同。以前，在古脊椎动物的脊椎的存在使其分配成问题，但最近确定的脊椎元件在八目鳗是一致的，这组和古脊椎动物之间的亲和力。这些证据支持古椎龙属与盲鳗的亲缘关系。此外，基于其颅骨形态的不太专业的特征，我们得出结论，古椎龙可能是一个干盲鳗。本文的在线版本（doi：10.1186/s40851-016-0057-0）包含补充材料，可供授权用户使用。
The taxonomic position of the Middle Devonian fish-like animal Palaeospondylus has remained enigmatic, due mainly to the inability to identify homologous cranial elements. This animal has been classified into nearly all of the major vertebrate taxa over a century of heuristic taxonomic research, despite the lack of conclusive morphological evidence. Here we report the first comparative morphological analysis of hagfish embryos and Palaeospondylus, and a hitherto overlooked resemblance in the chondrocranial elements of these animals; i.e., congruence in the arrangement of the nasal capsule, neurocranium and mandibular arch-derived velar bar. The large ventral skeletal complex of Palaeospondylus is identified as a cyclostome-specific lingual apparatus. Importantly, the overall morphological pattern of the Palaeospondylus cranium coincides well with the cyclostome pattern of craniofacial development, which is not shared with that of crown gnathostomes. Previously, the presence of the vertebral column in Palaeospondylus made its assignment problematic, but the recent identification of this vertebral element in hagfish is consistent with an affinity between this group and Palaeospondylus. These lines of evidence support the hagfish affinity of Palaeospondylus. Moreover, based on the less specialized features in its cranial morphology, we conclude that Palaeospondylus is likely a stem hagfish. The online version of this article (doi:10.1186/s40851-016-0057-0) contains supplementary material, which is available to authorized users.
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影响因子：
56.9
作者：
BARDACK, D
通讯作者：
BARDACK, D
影响因子：
0.9
作者：
Kuraku, Shigehiro;Kuratani, Shigeru
通讯作者：
Kuratani, Shigeru
影响因子：
64.8
作者：
Dupret, Vincent;Sanchez, Sophie;Ahlberg, Per E.
通讯作者：
Ahlberg, Per E.
影响因子：
2.7
作者：
Hirasawa T;Kuratani S
通讯作者：
Kuratani S
DOI：
10.1002/jez.b.21441
发表时间：
2012-01-15
影响因子：
2.2
作者：
Johanson, Zerina;Kearsley, Anton;Smith, Moya Meredith
通讯作者：
Smith, Moya Meredith