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Observations on the monotreme interclavicle
Author(s) -
Cave A. J. E.
Publication year - 1970
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.1469-7998.1970.tb03083.x
Subject(s) - biology , monotreme , pectoral girdle , supernumerary , rhinoceros , anatomy , coracoid , osteon , zoology , taxonomy (biology) , systematics , cortical bone
Attention is drawn to the presence of a constant, though commonly ignored, element (the “pro‐osteon” of Parker, 1868) in the constitution of the monotreme interclavicle (episternum) The probable nature and the fate of this element, peculiar to the immature interclavicle only, are described and its morphological significance is demonstrated to be epiphyseal. The epiphyses of the monotreme shoulder girdle are reviewed as to number, arrangement and fate. The occurrence is reported in a Tachyglossus skeleton of supernumerary (para‐pre‐coracoid) ossicles of which a possible interpretation is given.