✦ LIBER ✦

Evolution of the upper jaw mechanism in teleost fishes

✍ Scribed by JR Theodore H. Eaton

Publisher: John Wiley and Sons
Year: 1935
Tongue: English
Weight: 865 KB
Volume: 58
Category: Article
ISSN: 0362-2525
DOI: 10.1002/jmor.1050580106

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

This study reveals the existence of four distinct but genetically related types of upper jaw mechanisms:

The non‐protractile, with no mechanism for the protrusion of the pre‐maxillae. The maxillaries form part of the upper margin of the mouth, as in Isospondyli, Apodes and Haplomi.
The crossed ligaments in the snout as in Acanthopteri, Heterosomata and Anacanthini.
The twisting action type in which the internal hook of the maxilla drives out the pre‐maxilla as found in Cyprinodontes and Percesoces.
The rostral or sigmoid ligament attached to the pre‐maxilla as in Cyprinidae and Catostomidae.

The three protractile types all possess an enlarged pre‐maxilla with a medium dorsal process, suggesting a common origin of all from a single non‐protractile form of upper jaw.

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