A salamander that chews using complex, three-dimensional mandible movements
A salamander that chews using complex, three-dimensional mandible movements
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DOI：
10.1242/jeb.220749
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发表时间：
2020-01
影响因子：
2.8
通讯作者：
D. Schwarz;N. Konow;Yonas Tolosa Roba;E. Heiss
中科院分区：
文献类型：
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作者：
D. Schwarz;N. Konow;Yonas Tolosa Roba;E. Heiss
摘要大多数非哺乳动物的四足动物都有铰链式的颌部操作，仅限于垂直的张开和关闭动作。相比之下，许多哺乳动物的颌关节以更复杂的三维(3D)方式工作，不仅包括垂直运动，还包括前(嘴-尾)和横向(横向)运动。关于利桑菲比亚和蜥蜴口腔内食物加工的数据引发了一种普遍接受的观点，即这些群体大多不加减量地吞下食物，在利桑菲比亚和蜥蜴咀嚼的情况下，它们大多使用简单的垂直下巴运动来进行食物加工。这一普遍接受的观点的例外是在蜥蜴身上发生了一些细小的咀嚼。我们结合了来自双平面高速视频透视和微型计算机断层扫描的3D运动学和形态分析，以确定童态火蜥蜴是如何处理捕获的食物的。我们发现，中间链霉菌不仅使用口腔内食物加工，而且其精细的颌关节形态有助于下颌在所有三个平面上的运动，导致复杂的3D咀嚼。因此，我们的数据挑战了普遍持有的观点，即复杂的3D咀嚼运动是哺乳动物特有的，表明这种机制可能在四足动物进化的早期就进化了。内容提要：3D运动学和形态分析表明，中间足形火蜥蜴使用复杂的3D咀嚼，这表明这种机制可能在四足动物进化的早期就已经进化。
ABSTRACT Most non-mammal tetrapods have a hinge-like jaw operation restricted to vertical opening and closing movements. Many mammal jaw joints, by contrast, operate in more complex, three-dimensional (3D) ways, involving not only vertical but also propalinal (rostro-caudal) and transverse (lateral) movements. Data on intraoral food processing in lissamphibians and sauropsids has prompted a generally accepted view that these groups mostly swallow food unreduced, and that in those cases where lissamphibians and sauropsids chew, they mostly use simple vertical jaw movements for food processing. The exception to this generally accepted view is the occurrence of some propalinal chewing in sauropsids. We combined 3D kinematics and morphological analyses from biplanar high-speed video fluoroscopy and micro-computed tomography to determine how the paedomorphic salamander Siren intermedia treats captured food. We discovered not only that S. intermedia uses intraoral food processing but also that the elaborated morphology of its jaw joint facilitates mandibular motions in all three planes, resulting in complex 3D chewing. Thus, our data challenge the commonly held view that complex 3D chewing movements are exclusive to mammals, by suggesting that such mechanisms might have evolved early in the tetrapod evolution. Summary: 3D kinematics and morphological analysis reveal that the paedomorphic salamander Siren intermedia uses complex 3D chewing, suggesting that such mechanisms might have evolved early in the tetrapod evolution.