Living fast in the Triassic: New data on life history in Lystrosaurus (Therapsida: Dicynodontia) from northeastern Pangea.
Living fast in the Triassic: New data on life history in Lystrosaurus (Therapsida: Dicynodontia) from northeastern Pangea.
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DOI：
10.1371/journal.pone.0259369
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发表时间：
2021
期刊：
影响因子：
3.7
通讯作者：
Sidor CA
中科院分区：
文献类型：
--
作者：
Kulik ZT;Lungmus JK;Angielczyk KD;Sidor CA
在地球历史上最深刻的生物危机--二叠纪-三叠纪大灭绝中，Lystrosaurus是为数不多的幸存下来的四足动物之一。早三叠世大范围的古纬度和高丰度为研究大灭绝后生长动态和寿命的变化提供了独特的机会，但大多数研究只集中在生活在南半球的物种。在这里，我们介绍了中国西北部九彩园组采集的20种不同大小的水龙骨骼元素的长骨组织学特征。此外，我们比较了盘古岛北部和南部三叠纪物种的平均身体大小，并对南部和北部的类群进行了颅骨几何形态分析，以开始调查中国的标本是否可能在分类上与南非的标本不同。我们证明了中国的Lystrosaurus的平均身体尺寸比他们在盘古岛南部的近亲更大，并且他们的头骨形态是独特的。骨组织学检查显示，在中国的一些(但不是所有)未成熟个体中，持续、快速的成骨过程中穿插着生长痕迹。我们发现，中国水龙的骨组织学特征与南非水龙的生长模式相似，南非水龙的生长一直持续到死亡。然而，在中国样本中，骨骼生长停滞的频率更高。然而，这里采集的长骨中没有一块表明达到了最大或渐近大小，这表明九彩园组的水龙的最大大小仍然未知。
Lystrosaurus was one of the few tetrapods to survive the Permo-Triassic mass extinction, the most profound biotic crisis in Earth’s history. The wide paleolatitudinal range and high abundance of Lystrosaurus during the Early Triassic provide a unique opportunity to investigate changes in growth dynamics and longevity following the mass extinction, yet most studies have focused only on species that lived in the southern hemisphere. Here, we present the long bone histology from twenty Lystrosaurus skeletal elements spanning a range of sizes that were collected in the Jiucaiyuan Formation of northwestern China. In addition, we compare the average body size of northern and southern Pangean Triassic-aged species and conduct cranial geometric morphometric analyses of southern and northern taxa to begin investigating whether specimens from China are likely to be taxonomically distinct from South African specimens. We demonstrate that Lystrosaurus from China have larger average body sizes than their southern Pangean relatives and that their cranial morphologies are distinctive. The osteohistological examination revealed sustained, rapid osteogenesis punctuated by growth marks in some, but not all, immature individuals from China. We find that the osteohistology of Chinese Lystrosaurus shares a similar growth pattern with South African species that show sustained growth until death. However, bone growth arrests more frequently in the Chinese sample. Nevertheless, none of the long bones sampled here indicate that maximum or asymptotic size was reached, suggesting that the maximum size of Lystrosaurus from the Jiucaiyuan Formation remains unknown.
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DOI：
10.1098/rspb.2017.2331
发表时间：
2018-01-10
期刊：
Proceedings. Biological sciences
影响因子：
--
作者：
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通讯作者：
Benton MJ
影响因子：
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影响因子：
1.5
作者：
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通讯作者：
Smith, Roger M. H.
影响因子：
1.4
作者：
Botha-Brink, Jennifer
通讯作者：
Botha-Brink, Jennifer
影响因子：
2.3
作者：
Botha, J.;Smith, R. M. H.
通讯作者：
Smith, R. M. H.