Long bone histology of Ophiacodon reveals the geologically earliest occurrence of fibrolamellar bone in the mammalian stem lineage

Long bone histology of Ophiacodon reveals the geologically earliest occurrence of fibrolamellar bone in the mammalian stem lineage
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蛇尾蛇的长骨组织学揭示了哺乳动物干谱系中地质上最早出现的纤维板层骨

DOI:
10.1016/j.crpv.2017.02.002
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发表时间:
2017
影响因子:
1.1
通讯作者:
P. M. Sander
P. M. Sander
中科院分区:
地球科学3区
文献类型:
--
作者:
Shelton;P. M. Sander

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共同的组织学特征已被观察到的骨基质和血管之间的Ophiacodontidae和后来的therapsids(Synapsida)。从历史上看,这种巧合被解释为仅仅反映了假定的蛇齿鱼的水生生活方式,甚至是不成熟的标志。在这里,我们通过对蛇齿龙的个体发育系列以及其他材料进行组织学采样,表明了盘龙后颅骨中纤维板层骨(FLB)的存在。我们的研究结果再次证实了之前的研究中所描述的快速生长的组织,并通过代理,反驳了高度血管化的皮层只是年轻的反映。该组织显示了真正FLB的典型组织学特征。皮质由编织骨基质中的初级骨单位组成,并在整个个体发育过程中保持高度血管化,为快速骨骼生长提供证据。总的来说,我们在Ophiacodonis中描述的FLB组织在骨质发育、骨基质和骨骼生长方面比迄今为止描述的任何其他Pelycosaur taxon.With组织学记录更先进或“哺乳动物样”,我们的结果仍然没有定论,因为Ophiacodondue的首选生态学与其他肉食性Pelycosaur相似的皮质血管分布模式。我们的研究结果将FLB和高骨骼生长率的进化起源追溯到大约2000万年前的早二叠世,通过系统发育延伸,可能是晚石炭纪。
Shared histological characteristics have been observed in the bone matrix and vascularity between Ophiacodontidae and the later therapsids (Synapsida). Historically, this coincidence has been explained as simply a reflection of the presumed aquatic lifestyle ofOphiacodonor even a sign of immaturity. Here we show, by histologically sampling an ontogenetic series ofOphiacodonhumeri, as well as additional material, the existence of fibrolamellar bone (FLB) in the postcranial bones of a pelycosaur. Our findings have reaffirmed what previous studies first described as fast growing tissue, and by proxy, have disproven that the highly vascularized cortex is simply a reflection of young age. This tissue demonstrates the classic histological characteristics of true FLB. The cortex consists of primary osteons in a woven bone matrix and remains highly vascularized throughout ontogeny, providing evidence for fast skeletal growth. Overall, the FLB tissue we have described inOphiacodonis more advanced or “mammal-like” in terms of the osteonal development, bone matrix, and skeletal growth than what has been described thus far for any other pelycosaur taxon.With regards to the histological record, our results remain inconclusive as to the preferred ecology ofOphiacodondue to a similar cortical vascularity pattern exhibited by other carnivorous pelycosaurs. Our findings have set the evolutionary origins of FLB and high skeletal growth rates back approximately 20 million years to the Early Permian, and by phylogenetic extension perhaps the Late Carboniferous.
DOI: 10.1038/nature04633
发表时间: 2006-06
期刊: Nature
影响因子: 64.8
作者:
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DOI: --
发表时间: 2006
期刊:
影响因子: --
作者:
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影响因子: 1.2
作者:
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DOI: --
发表时间: 1940
期刊:
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作者:
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