Aphetohyoidea

(redirected from Placodermi)
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Related to Placodermi: class Placodermi

Aphetohyoidea

or

Placodermi

a group of fossil fish possessing a primitive jaw suspension (ligaments only) and a functional pair of first gill slits.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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