Feeding biomechanics in Acanthostega and across the fish-tetrapod transition.
Feeding biomechanics in Acanthostega and across the fish-tetrapod transition.
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棘螈和跨越鱼类四足动物过渡的摄食生物力学。
DOI：
10.1098/rspb.2013.2689
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Neenan JM
中科院分区：
文献类型：
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作者：
Neenan JM
螈是最早和最原始的四肢脊椎动物之一。它的许多鱼类特征表明主要是水生生活方式，但颅缝形态表明它的头骨更类似于陆生类群。在这里，我们应用几何形态测量学和二维有限元分析，以定量的形态和功能的变化，在整个鱼类四足动物过渡的下颌ofaculostega和其他22个tetrapodomorph类群。的颌骨oftetrapodomorph鱼和过渡泥盆纪类群的相似，在形态上（如其接近这些类群的morphospace）和功能（如所示的分布应力值和咬合力的相对大小）。我们的研究结果表明，缓慢节奏的形态和生物力学变化的过渡，从泥盆纪四足动物颌骨水生/半水生石炭纪四足动物颌骨。我们的结论是，棘齿龙具有一种水生的生活方式，并没有对陆生摄食的颅适应能力。
Acanthostegais one of the earliest and most primitive limbed vertebrates. Its numerous fish-like features indicate a primarily aquatic lifestyle, yet cranial suture morphology suggests that its skull is more similar to those of terrestrial taxa. Here, we apply geometric morphometrics and two-dimensional finite-element analysis to the lower jaws ofAcanthostegaand 22 other tetrapodomorph taxa in order to quantify morphological and functional changes across the fish–tetrapod transition. The jaw ofAcanthostegais similar to that of certain tetrapodomorph fish and transitional Devonian taxa both morphologically (as indicated by its proximity to those taxa in morphospace) and functionally (as indicated by the distribution of stress values and relative magnitude of bite force). Our results suggest a slow tempo of morphological and biomechanical changes in the transition from Devonian tetrapod jaws to aquatic/semi-aquatic Carboniferous tetrapod jaws. We conclude thatAcanthostegaretained a primitively aquatic lifestyle and did not possess cranial adaptations for terrestrial feeding.