Explain jaw suspension in fishes with suitable diagrams.

Question

24 Jan 2022

Answer :

Word Count : 485

Jaw suspension means attachment of the lower jaw with the upper jaw or the skull for efficient biting and chewing. There are different ways in which these attachments are attained depending upon the modifications in visceral arches in vertebrates.

There are 5 principal variants or types of suspensoria as follows

AUTODIASTYLIC

This condition was found in some earliest gnathostomes such as acanthodians. The jaws are attached to the cranium by anterior and posterior ligaments. Hyoid arch remains completely free or independent and does not support the jaws. The gill cleft in front of hyoid arch bears a complete gill and does not form any spiracle.

JAW SUSPENSIONS

AMPHISTYLIC

This is a rather primitive arrangement found in Crossopterygii and some primitive sharks ____ _________ _______ _____ ___ ___ _____ _____ _______ ______.
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