INNER-EAR OF THE COELACANTH FISH LATIMERIA HAS TETRAPOD AFFINITIES
INNER-EAR OF THE COELACANTH FISH LATIMERIA HAS TETRAPOD AFFINITIES
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DOI：
10.1038/327153a0
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发表时间：
1987-05-14
期刊：
影响因子：
64.8
通讯作者：
FRITZSCH, B
中科院分区：
文献类型：
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作者：
FRITZSCH, B
板鳃类、硬骨鱼类和两栖类的听觉接收可能由各种内耳感觉上皮介导1 -3，包括基底乳头，基底乳头似乎是哺乳动物耳蜗的前体。基底乳头的起源仍然是理解陆生脊椎动物听觉进化的一个主要未解决的问题4 -6。对现存物种的研究表明，基底乳头是四足动物的一个独特特征6，7，但古生物学数据表明，这种上皮细胞以及中耳已经存在于横鳍鱼中8 -10。然而，没有基底乳头已被发现在唯一活着的crossopterygian物种，coelacanthLatimeria chalumnae 11。我重新观察了成年和胚胎的Latimeria的内耳，发现一个膜性特化，在结构、位置和神经支配模式上类似于四足动物的基底乳头，特别是四足动物的基底乳头。在肺鱼中没有发现与基底乳头相当的上皮。笔者认为，宽尾类和四足类的基乳头是同源的，在它们的共同祖先中只进化了一次。
Auditory reception in elasmobranchs, teleosts and amphibians may be mediated by various inner-ear sensory epithelia1–3, including the basilar papilla, which seems to be the precursor of the cochlea in mammals. The origin of the basilar papilla remains a major unsolved problem for understanding the evolution of hearing in terrestrial vertebrates4–6. Study of living species indicates that the basilar papilla is a unique feature of tetrapods6,7, but palaeonto-logical data indicate that this epithelium as well as a middle ear, is already present in crossopterygian fish8–10. However, no basilar papilla has been found in the only living crossopterygian species, the coelacanthLatimeria chalumnae11. I have re-examined the inner ear of adult and embryonicLatimeriaand find a membranous specialization which resembles in structure, position and innerva-tion pattern the basilar papilla of tetrapods, in particular amniotes. No epithelium comparable to the basilar papilla was found in lungfish. I suggest that the basilar papillae ofLatimeriaand tetrapods are homologous and evolved only once in their common ancestor.