The functional morphology of lingual prey capture in a scincid lizard, Tiliqua scincoides (Reptilia: Squamata),Journal of Morphology

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The functional morphology of lingual prey capture in a scincid lizard, Tiliqua scincoides (Reptilia: Squamata)
Journal of Morphology ( IF 1.5 ) Pub Date : 2020-10-22 , DOI: 10.1002/jmor.21287
Amanda E Hewes _{1,

2} , Kurt Schwenk ₁

Affiliation

We investigated the functional morphology of lingual prey capture in the blue‐tongued skink, Tiliqua scincoides, a lingual‐feeding lizard nested deep within the family Scincidae, which is presumed to be dominated by jaw‐feeding. We used kinematic analysis of high‐speed video to characterize jaw and tongue movements during prey capture. Phylogenetically informed principal components analysis of tongue morphology showed that, compared to jaw‐feeding scincids and lacertids, T. scincoides and another tongue‐feeding scincid, Corucia zebrata, are distinct in ways suggesting an enhanced ability for hydrostatic shape change. Lingual feeding kinematics show substantial quantitative and qualitative variation among T. scincoides individuals. High‐speed video analysis showed that T. scincoides uses significant hydrostatic elongation and deformation during protrusion, tongue‐prey contact, and retraction. A key feature of lingual prey capture in T. scincoides is extensive hydrostatic deformation to increase the area of tongue‐prey contact, presumably to maximize wet adhesion of the prey item. Adhesion is mechanically reinforced during tongue retraction through formation of a distinctive “saddle” in the foretongue that supports the prey item, reducing the risk of prey loss during retraction.

中文翻译：

scincid 蜥蜴 Tiliqua scincoides（爬行动物：有鳞蜥蜴）捕食舌部猎物的功能形态

我们研究了蓝舌石龙子 Tiliqua scincoides 捕食舌部猎物的功能形态，Tiliqua scincoides 是一种栖息在 Scincidae 家族深处的舌食蜥蜴，推测其主要以颌部进食为主。我们使用高速视频的运动学分析来表征捕获猎物期间下巴和舌头的运动。舌形态学的系统发育主成分分析表明，与食颚的 scincids 和 lecertids 相比，T. scincoides 和另一种食舌的 scincoides，Corucia zebrata，在某些方面是不同的，表明静水形状变化的能力增强。舌食运动学在 T. scincoides 个体之间显示出大量的数量和质量变化。高速视频分析表明，T. scincoides 在突出、舌-猎物接触和缩回过程中使用显着的流体静力伸长和变形。T. scincoides 捕获舌部猎物的一个关键特征是广泛的静水变形，以增加舌与猎物的接触面积，大概是为了最大限度地提高猎物的湿附着力。通过在支持猎物的前舌中形成一个独特的“鞍座”，在舌头回缩过程中机械地加强了粘附力，从而降低了回缩过程中猎物丢失的风险。

更新日期：2020-10-22

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