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Development of the pelvic fins of acipenser ruthenus. New data for the theory of the paired fins of fishes
Author(s) -
Sewertzoff A. N.
Publication year - 1926
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.1050410208
Subject(s) - biology , anatomy , fin , fish fin , axial skeleton , pelvic girdle , fish <actinopterygii> , fishery , materials science , composite material
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.