Laurin Michel
Institut für Paläontologie, Naturhistorisches Forschungsinstitut, Museum für Naturkunde, Zentralinstitut der Humboldt-Universität zu Berlin, Invalidenstraße 43, D-10115, Berlin, Germany.
Evolution. 1998 Oct;52(5):1476-1482. doi: 10.1111/j.1558-5646.1998.tb02028.x.
The hypothesis suggested by Coates that pentadactyly arose twice is based on the presumed affinities between Tulerpeton, embolomeres, and amniotes. Flaws were found in the coding of some characters that supported this clade and, once corrected, the matrix fails to support the proposed phylogeny. Furthermore, interpretation of the phylogeny of Coates is difficult because no amniotes and no lissamphibians were included in this analysis. A reappraisal of the affinities of Tulerpeton using a matrix composed of a greater range of taxa suggests that it is a stem-tetrapod, that pentadactyly arose only once, and that the first tetrapod was already pentadactyl.
科茨提出的五指型四肢独立起源两次的假说，是基于图勒螈、迷齿亚纲和羊膜动物之间假定的亲缘关系。在支持这一进化枝的一些性状编码中发现了缺陷，一旦修正，矩阵就无法支持所提出的系统发育。此外，由于该分析未纳入任何羊膜动物和滑体两栖动物，因此很难解读科茨的系统发育情况。使用包含更多分类群的矩阵对图勒螈的亲缘关系进行重新评估表明，它是一种干群四足动物，五指型四肢只起源了一次，并且最早的四足动物就已经是五指型的了。
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