AN EARLY PERMIAN VARANODONTINE VARANOPID (SYNAPSIDA: EUPELYCOSAURIA) FROM THE RICHARDS SPUR LOCALITY, OKLAHOMA
AN EARLY PERMIAN VARANODONTINE VARANOPID (SYNAPSIDA: EUPELYCOSAURIA) FROM THE RICHARDS SPUR LOCALITY, OKLAHOMA
复制标题
俄克拉荷马州理查兹斯普尔地区的早二叠世巨齿类蜥蜴科（合弓类：真龙类）
DOI：
--
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
R. Reisz
中科院分区：
文献类型：
--
作者：
Hillary C. Maddin;David C Evans;R. Reisz
摘要描述了来自俄克拉荷马州多莱塞兄弟石灰石采石场（理查兹支线）的高含钙石灰石裂隙充填矿床的第一个varanodontine varanopid材料，是基于从两个独立的沉积岩块中回收的至少三个个体的元素。其中一块，产生了相关的颅骨和颅后骨从成人和青少年的个人，包括两个保存完好的parasisphenoid复合体，椎骨，前肢，骨盆带，和后肢骨。一个孤立的上颌骨片段从另一个块保存的诊断背过程的特点varanodontines。保存下来的颅骨和颅后材料几乎与短吻巨蜥相同。在Varanopidae迄今为止最全面的系统发育分析的背景下，这种新材料的分类学评估表明，理查兹马刺varanodontine是可识别的Varanops brevirostris基于上颌骨和parabasisphenoid的独特特征。Varanops的巨大体型表明它是理查兹支线生态系统的顶级掠食者之一。理查兹支线地区记录了唯一已知的同时出现的一个mycterosaurine和一个varanodtine varanopid在一个单一的位置，varanopids是最常见的联会动物组合。作为保存较为典型的低地环境中较为罕见的组成部分，理查兹支脉的Varanopids的相对丰度和多样性表明，它们可能是早二叠世高地生态系统中较为常见的组成部分。
Abstract Description of the first varanodontine varanopid material from the highly fossiliferous limestone fissure fill deposits at Richards Spur (Dolese Brothers Limestone Quarry), Oklahoma, is based on elements of at least three individuals recovered from two separate blocks of sedimentary rock. One block, which yielded associated cranial and postcranial bones from both adult and juvenile individuals, includes two well-preserved parabasisphenoid complexes, vertebrae, forelimb, pelvic girdle, and hind limb bones. An isolated maxilla fragment from another block preserves the diagnostic dorsal process characteristic of varanodontines. Preserved cranial and postcranial material is virtually identical to the varanodontine Varanops brevirostris. Taxonomic assessment of this new material in the context of the most comprehensive phylogenetic analysis of Varanopidae to date indicates the Richards Spur varanodontine is referable to Varanops brevirostris based on distinctive characters of the maxilla and the parabasisphenoid. The large size of Varanops suggests it was one of the top predators of the Richards Spur ecosystem. The Richards Spur locality records the only known co-occurrence of a mycterosaurine and a varanodontine varanopid at a single locality, and varanopids are the most common synapsids in the assemblage. As generally rare components of the more typically preserved lowland environments, the relative abundance and diversity of varanopids at Richards Spur suggests that they may have been more common components of the upland ecosystems in the Early Permian.