Vestibular labyrinth diversity in diprotodontian marsupial mammals
Vestibular labyrinth diversity in diprotodontian marsupial mammals
复制标题
双原齿类有袋哺乳动物的前庭迷路多样性
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
W. Maier
中科院分区：
文献类型：
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作者：
T. Schmelzle;M. Sánchez;W. Maier
摘要 代表八个双原齿动物物种的标本骨迷路通过高分辨率计算机断层扫描进行可视化。对迷路进行线性测量，例如每个半规管弧的高度和宽度。比较了半规管的相对大小和空间排列，并将一些变异分解为 17 个性状，然后进行系统发育解释。半规管的大小和相对排列都发生了变化，在某些方面反映了从树栖到陆地的生态变化。特别是，双原齿动物中前半规管与后半规管的高度存在差异。树栖物种的侧半规管比陆地物种的相应半规管相对较长。双齿齿目中普遍存在更圆的前半规管，但在拟螯足科中则发生了变化，前半规管变得更加扁平。尽管松蜥属树栖生活方式，但仍显示出陆地物种的典型特征。它显示出派生的性格状态的事实与它继而最近才进化出树栖生活方式的事实是一致的。
ABSTRACT The bony labyrinth of specimens representing eight diprotodontian species were visualized by high-resolution computed tomography. Linear measurements of the labyrinth were taken, e.g., the height and width of the arc of each semicircular canal. The relative sizes and spatial arrangements of the semicircular canals were compared and some of the variation was atomized into 17 characters, which were then phylogenetically interpreted. There has been a change both in size and in relative arrangement of the semicircular canals that for some aspects maps onto the ecological change from arboreality to terrestriality. In particular, there are differences among diprotodontians in the height of the anterior semicircular canal in relation to the posterior one. In arboreal species, the lateral semicircular canal is relatively longer than the equivalent semicircular canals of terrestrial species. A rounder anterior semicircular canal is widespread for Diprotodontia with a shift in Pseudocheiridae, where it is more flattened. Dendrolagus shows features typical of terrestrial species in spite of its arboreal lifestyle. The fact that it shows the derived character state is congruent with the fact that it has secondarily and only recently evolved an arboreal lifestyle.