New Taxonomic Features of Fossil Clam Shrimp Aquilonoglypta (Spinicaudata) and its Implication for Origin of Triglyptids
New Taxonomic Features of Fossil Clam Shrimp Aquilonoglypta (Spinicaudata) and its Implication for Origin of Triglyptids
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DOI：
10.2517/pr200028
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发表时间：
2022-01
影响因子：
0.9
通讯作者：
Gang Li
中科院分区：
文献类型：
--
作者：
Gang Li
抽象的。根据沿着俄罗斯拉普捷夫海沿岸下三叠统采集的标本，首次建立了三叠纪蛤蜊虾属Aquilonoglypta Novojilov，1958年。它最初的诊断装饰被描述为鱼鳞坑。在鄂尔多斯盆地下、中三叠统又发现了该属。由于中国标本具点状纹饰，因此被认为是侏罗纪三雕类的祖先。在这项研究中的诊断Aquilonoglypta修订后，重新检查俄罗斯模式标本扫描电子显微镜（SEM）。在Aquilonoglypta的生长带附近的脐是由多边形的细网，过渡到斑点的生长带的中部的甲壳。背甲腹侧的生长带上的平行排列清楚地表明了从斑点到尺寸增加的细网状图案的过渡。这一研究结果表明，由于三角形动物背甲背侧生长带上缺乏细密的网状结构，故不可能是其与三角形动物的紧密联系。相反，Triglypta Wang，1984可能与Punctatestheria Zhang等更接近，2017.
Abstract. The Triassic clam shrimp genus Aquilonoglypta Novojilov, 1958 was first erected based on a specimen collected from the Lower Triassic along the Laptev Sea coast of Russia. Its original diagnostic ornament was described as fish scale pits. Then, the genus was recovered in the Lower and Middle Triassic in the Ordos Basin in northwestern China. Because the Chinese specimens have punctate ornamentation, they were interpreted as the ancestor of the Jurassic triglyptids. In this study the diagnosis of Aquilonoglypta is revised following a re-examination of the Russian type specimens under a scanning electron microscope (SEM). In Aquilonoglypta growth bands near the umbo are ornamented with polygonal fine reticulation, which transitions to puncta on growth bands in the middle part of the carapace. The ornamentation on growth bands in the ventral part of the carapace clearly shows the transition from the puncta to a size-increasing fine reticulation pattern. This research result shows that Aquilonoglypta could not be the close link with triglyptids because of lacking of the fine reticulation on growth bands in the dorsal part of the carapace in the latter. On the contrary Triglypta Wang, 1984 could be more closely related to Punctatestheria Zhang et al., 2017.