Long bone histology indicates sympatric species of Dimetrodon (Lower Permian, Sphenacodontidae)
Long bone histology indicates sympatric species of Dimetrodon (Lower Permian, Sphenacodontidae)
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长骨组织学表明异齿龙属同域物种（下二叠统，Sphenacodontidae）
DOI：
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发表时间：
2012
影响因子：
1.2
通讯作者：
H. Winkelhorst
中科院分区：
文献类型：
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作者：
Christen D. Shelton;P. Sander;Koen Stein;H. Winkelhorst
摘要 位于阿彻县的石南溪骨床（Artinskian，诺科纳组）是美国德克萨斯州下二叠统异齿龙骨骼最丰富的来源之一。根据大小，该地区描述了小型物种（D. natalis）、中型物种（D. booneorum）和大型物种（D.limbatus）。有人提出，这些传统上公认的物种仅代表一个物种的个体发育系列。然而，个体发生系列假说与小骨的晚期个体发生状态不一致，正如它们的骨学和骨化程度所表明的那样。对石南溪骨床新出土材料的组织学分析已经解决了这两个相互竞争的假设之间的一些判断，证实了一种小型异齿龙（D. natalis）与至少一种较大的异齿龙物种的共存。最大的长骨样本中存在外部基本系统，被确定为 D. natalis。颅后 D. natalis 的组织学被描述为早期纤维板层骨。该组织是平行纤维骨和编织纤维骨的组合，由初期的初级骨形成高度血管化。 D. booneorum 和 D.limbatus 的物种状况仍未确定。
ABSTRACT The Briar Creek Bonebed (Artinskian, Nocona Formation) in Archer County is one of the richest sources of Dimetrodon bones in the Lower Permian of Texas, USA. Based on size, a small (D. natalis), an intermediate (D. booneorum), and a large species (D. limbatus) have been described from this locality. It has been proposed that these traditionally recognised species represent an ontogenetic series of only one species. However, the ontogenetic series hypothesis is inconsistent with the late ontogenetic state of the small bones, as suggested by their osteology and degree of ossification. Histological analysis of newly excavated material from the Briar Creek Bonebed has resolved some of the discretion between these two competing hypothesis, confirming the coexistence of a small (D. natalis) with at least one larger Dimetrodon species. An external fundamental system is present in the largest sampled long bones identified as D. natalis. The histology of D. natalis postcrania is described as incipient fibro lamellar bone. This tissue is a combination of parallel-fibred and woven-fibred bone that is highly vascularised by incipient primary osteons. The species status of D. booneorum and D. limbatus remain unresolved.
影响因子：
3.7
作者：
Klein N
通讯作者：
Klein N