Abstract

This paper describes the microanatomical and histological structure of different-sized femora and hypocentra of the archegosauroid amphibian Platyoposaurus stuckenbergi from the Middle Permian (Urzhum horizon, Estemmenosuchus uralensis zone) of Eastern Europe. Age variability is discussed in a comparative context, along with the ecology of the species. P. stuckenbergi femora are characterized by the complete absence of calcified cartilage and the presence of up to 15 lines of arrested growth (LAGs); hypocentra have an osteoporotic structure, lacking both calcified cartilage and LAGs. Microanatomical and morphological features indicate the predominantly aquatic lifestyle of Platyoposaurus as an active predator in river and lake habitats.

中文翻译：

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来自东欧中二叠纪的 1884 年（Temnospondyli，Archegosauridae）Platyoposaurus standenbergi Trautschold 颅后骨骼组织结构的年龄变异

摘要

本文描述了来自东欧中二叠世（乌尔朱姆地平线，Estemmenosuchus uralensis带）的原始龙类两栖动物扁尾龙不同大小的股骨和下腹的显微解剖学和组织学结构。在比较背景下讨论年龄变异性以及物种的生态。P。斯卡滕贝吉股骨的特点是完全没有钙化软骨，并且存在多达 15 条生长停滞线 (LAG)；Hypocentra 具有骨质疏松结构，缺乏钙化软骨和 LAG。显微解剖学和形态学特征表明鸭嘴龙以水生为主的生活方式 作为河流和湖泊栖息地的活跃捕食者。