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Homology of the paired fins in fishes

✍ Scribed by A. Brazier Howell

Publisher: John Wiley and Sons
Year: 1933
Tongue: English
Weight: 324 KB
Volume: 54
Category: Article
ISSN: 0362-2525
DOI: 10.1002/jmor.1050540303

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Recent and fossil fishes may be divided into groups having both pectoral and pelvic fins, pectorals only, pelvics only, or with a second pair of fins located anteriorly and seemingly not homologous with pelvics. In some groups the pelvics are located near the cloaca, with an extensive hiatus between the pectoral and pelvic neuromeres; other groups are of an intermediate character, while in a third group the second pair of fins appears to have no relationship to the pelvics. The character of the innervation indicates that they could hardly have been derived from the latter, and the few nerves, consecutive with the brachial plexus, which supply them suggest origin from the posterior elements of the dermal series, the anterior of which became the pectoral fins. Instances even occur (Polynemus) in which a third pair of appendages has been derived from the original pectoral complex.

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