Acanthodii

A Dictionary of Zoology | Date: 1999

Acanthodii Class of primitive, fossil fish that had a true bony skeleton, a heterocercal tail fin, a persistent notochord, ganoid scales, and stout spines in front of the fins. The acanthodians lived from the Silurian Period to the Permian Period and may be related to ancestors of the more modern bony fish.


© A Dictionary of Zoology 1999, originally published by Oxford University Press 1999.

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Related entries from encyclopedias, dictionaries, and thesauruses

Climatiiformes
A Dictionary of Zoology Climatiiformes (spiny sharks; class Acanthodii ) One of the larger orders of fossil fish that had bony jaws and body skeleton, ganoid scales, a heterocercal tail , and stout ... Read more
Teleostomi
A Dictionary of Zoology ... contrast to the shark-like fish ( Chondrichthyes ) which have the mouth positioned beneath a substantial rostrum. In addition to the Osteichthyes, some authors also include the class of fossil Acanthodii in the Teleostomi. See also BONY FISH . Read more