The hyomandibular of Eusthenopteron foordi Whiteaves (Pisces: Crossopterygii) and the early evolution of the tetrapod stapes

Autor:	T. R. Smithson, K. S. Thomson
Rok vydání:	1982
Předmět:	biology Truncus Animal Science and Zoology Anatomy Eusthenopteron biology.organism_classification Ecology Evolution Behavior and Systematics Tetrapod Stapes
Zdroj:	Zoological Journal of the Linnean Society. 74:93-103
ISSN:	0024-4082
DOI:	10.1111/j.1096-3642.1982.tb01142.x
Popis:	The hyomandibular of Eusthenopteron foordi Whiteaves is briefly described and an attempt is made to reconcile discrepancies between previous accounts. The course of the branches of the truncus hyoideo-mandibularis (facial nerve VII) is discussed. The early evolution of the tetrapod stapes is considered in connection with the uncoupling of the head from the trunk and subsequent reduction in size ot the semicircular canals. The principal morphological character which distinguishes the stapes from the hyomandibular is found to be related to the course of the orbital (stapedial) artery and the truncus hyoideo-mandibularis.
Databáze:	OpenAIRE
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