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A probable homologue of the clavicle in the holostean fish Amia calva
Author(s) -
Liem Karel F.,
Woods Loren P.
Publication year - 1973
Publication title -
journal of zoology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0952-8369
DOI - 10.1111/j.1469-7998.1973.tb05067.x
Subject(s) - biology , pectoral girdle , appendage , anatomy , ossicles , ossification , coracoid , clavicle , ontogeny , structural similarity , homology (biology) , evolutionary biology , gene , genetics , middle ear , biochemistry
The two pairs of appendages associated with the throat region in Amia are described. The posterior serrated appcndage of Amia calva is considered a homologue of the clavicle. This theory is based on topographical similarity (a bony element situated in front of the ventral part of the cleithrum and overlapping the anterior margin of the adjoining part of the cleithrum), structural similarity (cellular bone with ridges bearing denticles arranged in distinct patterns), ontogenetic similarity (early ontogenctic ossification with other dements of the dermal shoulder girdle prior to the appearance of scales), and phylogenetic cvidcnce (presence of similar elements in the caturid Furo ). Although the anterior serrated appendage of A. calva exhibits structural and topographical similarities to both scales and clavicles, the ontogenetic evidence favours an homology with scales. The ossicles located dorsolateral and lateral to the anteroventral part of the cleithrum in Lepisosteus oculatus share structural and topographical similarities to both scales and clavicles. However, ontogenetic evidence indicates that these ossicles are scales rather than fragmented clavicles.