Anatomy of Eocaecilia Micropodia, a limbed caecilian of the early jurassic
Anatomy of Eocaecilia Micropodia, a limbed caecilian of the early jurassic
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DOI：
10.3099/0027-4100(2007)158
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发表时间：
2007-08-20
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影响因子：
--
通讯作者：
Carroll, Robert L.
中科院分区：
文献类型：
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作者：
Jenkins, Farish A., Jr.;Walsh, Denis M.;Carroll, Robert L.
Eocaecilia micropodia是一种来自亚利桑那州东北部卡耶塔组的早侏罗世无足目动物，在结构上与现代gymnophiouaus在许多方面具有可比性，但也具有原始或似乎是独特衍生的特征。Eocaecilia的头骨具有明显的盲肠动物特征，如：（1）沿眶缘有沿着的沟，表明触突的存在;（2）基骨，表明枕上、枕外、基蝶骨、基枕、侧蝶骨和副蝶骨的合并;（3）内鼻，位于前上颌缝的后方，犁骨和腭骨上的齿列的内侧;（4）鼻囊增大;（5）犁骨上有嗅隆起。在现代的无尾目中，下塞由一条假齿和假角骨组成，它们沿着一条细长的斜缝相连。假角骨具有强健的内突和细长的关节后突。牙齿是二尖的，有花梗，但尺寸微小，数量比大多数活的无尾目动物多。
Eocaecilia micropodia, an Early Jurassic caecilian from the Kayenta Formation of northeastern Arizona, is structurally comparable to Recent gymnophiouaus in numerous aspects but also possesses characters that are primitive or appear to be uniquely derived. The skull of Eocaecilia exhibits such distinctively caecilian features as (1) a sulcus along the orbital rim indicating the presence of a tentaculum; (2) an os basale representing consolidation of the supraoccipital, exoccipital, basisphenoid, basio- ccipital, pleurosphenoid, and parasphenoid elements; (3) an internal naris posterior to the premaxillary-maxillary Suture and medial to the tooth rows on the vomer and palatine; (4) enlarged nasal capsules; and (5) an olfactory eminence on the vomer. As in Recent caecilians, the lower jam comprises a pseudodentary and pseudoangular that are joined along an elongate, oblique suture. The pseudoangular bears a robust internal process and in elongate retroarticular process. The teeth ire bicuspid and pedicellate, but are minute in size and are more numer ous than in most living caecilians.