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Quarterly Journal of Microscopical Science, Vol s2-83, 459-464, Copyright © 1942 by Company of Biologists

Denticles in Fossil Actinopterygii

E. S. GOODRICH F.R.S.

The Palaeoniscid Whiteichthys greenlandicus M.-Th. has superficial true denticles in addition to its dermal bones, body-scales, and lepidotrichia. The denticles may become fused on to these underlying bony structures. Though such denticles are present in Polypterus and Lepidosteus, and in some Siluridae, they have not hitherto been found in fossil Actinopterygii. There is good evidence that a covering of superficial subepidermal denticles was present not only in primitive Chondrichthyes, but also in all primitive Osteiehthyes.






© The Company of Biologists Ltd 1942