Semionotiformes

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Semionotiformes

order of fishes

Learn about this topic in these articles:

annotated classification

In fish: Annotated classification
Order Semionotiformes (gar and fossil relatives) 3 (2 extinct and 1 living) families of widely divergent fishes; probably independent of the Amiiformes but with typical holostean characters; length to about 3 metres (roughly 10 feet). Late Permian to present. Infraclass Teleostei (advanced bony
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characteristics and classification

In holostean: Skeletal features
…infraclass Holostei includes the orders Semionotiformes, Pycnodontiformes, and Amiiformes. In these orders the preoperculum (an L-shaped bone anterior to the operculum, or gill cover) is tied to the palatal elements and provides part of the originating area for the adductor mandibulae muscle.
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