Calcified cartilage in the paired fins of the osteostracan Escuminaspis laticeps (Traquair 1880), from the Late Devonian of Miguasha (Quebec, Canada), with a consideration of the early evolution of the pectoral fin endoskeleton in vertebrates
Calcified cartilage in the paired fins of the osteostracan Escuminaspis laticeps (Traquair 1880), from the Late Devonian of Miguasha (Quebec, Canada), with a consideration of the early evolution of the pectoral fin endoskeleton in vertebrates
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DOI：
10.1671/0272-4634(2004)024
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发表时间：
2004-12-10
影响因子：
1.4
通讯作者：
Desbiens, S
中科院分区：
文献类型：
--
作者：
Janvier, P;Arsenault, M;Desbiens, S
来自加拿大密瓜沙上泥盆世的骨肉瘤Escuminaspis laticeps的成对鳍内描述了球状钙化软骨斑块，从而证实了Belles-Isles对这些斑块的解释作为成对鳍内骨骼的证据。这些钙化软骨斑块的分布表明，骨支架配对鳍内骨骼是位于鳍外侧一半的单个软骨板，因此不是由单独的径向组成。这种形态类似于鱼的颚口动物的胚胎和幼虫胸鳍的内骨骼盘，在其分解成放射状之前，可能反映了包括骨软骨动物和颚口动物在内的进化支的一般情况。
Patches of spherulitic calcified cartilage are described inside the paired fins of the osteostracan Escuminaspis laticeps from the Upper Devonian of Miguasha, Canada, thereby confirming Belles-Isles interpretation of these patches as evidence for paired fin endoskeleton. The distribution of these calcified cartilage patches suggests that the osteostracan paired fin endoskeleton was a single cartilaginous plate located in the lateral half of the fin, and was thus not made up of separate radials. This morphology resembles that of the endoskeletal disc of the embryonic and larval pectoral fin of piscine gnathostomes, prior to its decomposition into radials, and may mirror the general condition for the clade that includes osteostracans and gnathostomes.