Variability of the Dermal Elements of the Pectoral Girdle in Platyoposaurus (Temnospondyli, Archegosauridae) from the Middle Permian of Eastern Europe

A. V. Uliakhin
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Abstract

The variability of the dermal elements of the pectoral girdle (clavicle, interclavicle), as the most morphologically informative part of the postcranial skeleton in the archegosaurid amphibian Platyoposaurus from the Middle Permian of Eastern Europe, was studied. Based on the considered morphological characters of the clavicle and interclavicle in P. watsoni , the increasing complexity of ornamentation of the dermal elements (a growth of the cellular area in the ossification center as additional cells appear, more complex branching of the radial grooves) with size was established for the first time using the morphometric parameters. The age-related ornament transformation favored the acquisition of additional strength with an increase in the load on the shoulder girdle during the growth process and in the body weight. It was found that the structural characters of the cellular area and radial ridges and also the morphometric parameters (lateral inclination angle of the dorsal process, the ratio of the width of the interclavicle plate to its length from the posterior end to the ossification center) can serve as additional diagnostic features to distinguish both Platyoposaurus from others archegosauroids and between the species of the genus under consideration. Individual differences were detected mainly in the analysis of the structure of the dorsal process of the same-sized clavicles: the lamina posterior is straightened or arcuate; the lamina anterior is straight or arcuate.
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东欧中二叠世鸭嘴龙(Temnospondyli,太古龙科)胸带真皮成分的变异
本文研究了东欧中二叠纪始古两栖类鸭嘴龙(Platyoposaurus)颅后骨骼中形态信息最丰富的部分——胸带(锁骨、锁骨间)皮肤成分的变异。在研究了水蛭锁骨和锁骨间的形态学特征的基础上,首次利用形态计量学参数确定了表皮元素纹饰的复杂性(骨化中心的细胞面积随着额外细胞的出现而增加,径向凹槽分支更加复杂)随尺寸的增加。随着生长过程中肩带负荷的增加和体重的增加,与年龄相关的装饰变化有利于获得额外的力量。发现细胞面积和径向脊的结构特征以及形态计量学参数(背突侧倾角、锁骨间板从后端到骨化中心的宽度与长度之比)可以作为附加的诊断特征,以区分Platyoposaurus与其他始祖龙以及所研究属的种之间。个体差异主要体现在对相同大小锁骨背突结构的分析上:后椎板呈伸直或弓形;前椎板直或呈弓形。
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0.70
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审稿时长
17 weeks
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