Letting the 'cat' out of the bag: pouch young development of the extinct Tasmanian tiger revealed by X-ray computed tomography.
Letting the 'cat' out of the bag: pouch young development of the extinct Tasmanian tiger revealed by X-ray computed tomography.
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DOI：
10.1098/rsos.171914
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发表时间：
2018-03
影响因子：
3.5
通讯作者：
Pask AJ
中科院分区：
文献类型：
--
作者：
Newton AH;Spoutil F;Prochazka J;Black JR;Medlock K;Paddle RN;Knitlova M;Hipsley CA;Pask AJ
塔斯马尼亚虎或袋狼(Thylacinus Cynocephalus)是澳大利亚一种标志性的有袋类捕食者，在20世纪初被猎杀至灭绝。尽管它们与犬科动物有着惊人的相似之处，但它们并没有进化出许多食肉胎盘哺乳动物特有的特殊解剖特征。这些进化限制被认为是由与有袋类繁殖模式相关的功能限制引起的，在有袋类繁殖模式中，高度高雅的幼体使用发育良好的前肢爬到袋子和嘴巴上哺乳。在这里，我们提出了第一个三维数字发育系列袋使用X射线计算机断层扫描对所有已知的乙醇保存标本。基于详细的骨骼测量，我们完善了物种生长曲线，以改善对个体的年龄估计。将附肢骨骼(前肢和后肢)的异速生长趋势与其他胎盘和有袋类哺乳动物的生长趋势进行比较发现，尽管袋狼具有独特的成体形态，但它们保持着普遍的早期有袋个体发育。我们的方法还发现了标记错误的标本，这些标本具有大的耻骨(袋狼的残留)和不同的椎体数量。我们生成的所有CT模型都是公开可用的，保留了它们的发育形态，并为这种独特的有袋类动物的未来研究提供了一个新的数字资源。
The Tasmanian tiger or thylacine (Thylacinus cynocephalus) was an iconic Australian marsupial predator that was hunted to extinction in the early 1900s. Despite sharing striking similarities with canids, they failed to evolve many of the specialized anatomical features that characterize carnivorous placental mammals. These evolutionary limitations are thought to arise from functional constraints associated with the marsupial mode of reproduction, in which otherwise highly altricial young use their well-developed forelimbs to climb to the pouch and mouth to suckle. Here we present the first three-dimensional digital developmental series of the thylacine throughout its pouch life using X-ray computed tomography on all known ethanol-preserved specimens. Based on detailed skeletal measurements, we refine the species growth curve to improve age estimates for the individuals. Comparison of allometric growth trends in the appendicular skeleton (fore- and hindlimbs) with that of other placental and marsupial mammals revealed that despite their unique adult morphologies, thylacines retained a generalized early marsupial ontogeny. Our approach also revealed mislabelled specimens that possessed large epipubic bones (vestigial in thylacine) and differing vertebral numbers. All of our generated CT models are publicly available, preserving their developmental morphology and providing a novel digital resource for future studies of this unique marsupial.
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DOI：
10.1002/jez.b.22556
发表时间：
2014-06-01
影响因子：
2.2
作者：
Beiriger, Anastasia;Sears, Karen E.
通讯作者：
Sears, Karen E.
影响因子：
0.8
作者：
GUILER E R
通讯作者：
GUILER E R
影响因子：
2
作者：
Jones, ME;Stoddart, DM
通讯作者：
Stoddart, DM
影响因子：
3.7
作者：
Doube M;Wiktorowicz-Conroy A;Christiansen P;Hutchinson JR;Shefelbine S
通讯作者：
Shefelbine S
影响因子：
56.9
作者：
BIEWENER, AA
通讯作者：
BIEWENER, AA