Development of the pelvic fins of acipenser ruthenus. New data for the theory of the paired fins of fishes
Identifieur interne : 002585 ( Main/Merge ); précédent : 002584; suivant : 002586Development of the pelvic fins of acipenser ruthenus. New data for the theory of the paired fins of fishes
Auteurs : A. N. Sewertzoff [Russie]Source :
- Journal of Morphology [ 0362-2525 ] ; 1926-03.
Abstract
The pelvic fins of the ancestors of the Chondrosteoidei possessed a metameric musculature and their skeleton consisted of a large number of metamerically arranged cartilaginous fin‐rays, to which were attached osseous lepidotrichia. Evolution has involved the concrescence of separate elements to form the basal cartilage, the proximal end of which forms the girdle of the fin; the loss of a number of the fin‐rays, and the atrophy of distal elements of the rays. The adult Chondrosteoidei have retained the primitive fin structure which characterized the elasmobranchs of the Palaeozoic period and which has disappeared in recent forms.
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DOI: 10.1002/jmor.1050410208
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