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Overview
Actinopterygii
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; class Osteichthyes)
A subclass of ray-finned fish, that includes the majority of living bony fish of sea and fresh water. The fins are composed of a membranous web of skin supported by a varying number of spines and soft rays. This subclass includes a diversity of fish types, ranging from the sturgeon and paddlefish to the eel and tuna. They first appeared during the Devonian Period.
From: Actinopterygii in A Dictionary of Zoology »
Subjects: Science and technology — Life Sciences
