Actinopterygii

Ray-finned fish (class Actinopterygii), meaning ('ray-shaped fin') are the largest group of fish. These bony fish evolved during the very end of the Silurian, about 408 million years ago. These fish dominate the seas today. Sharks are not ray-finned fish.
Found on http://www.enchantedlearning.com/subjects/dinosaurs/glossary/

Actinopterygii

(from the article `vertebrate`) ...scales; paired nostrils with or without internal nares; lateral-line system; mostly oviparous with external fertilization; some ovoviviparous or ... ...types of lungfishes, 1 each in Australia, Africa, and South America. Length 60–200 cm (roughly 24–80 in.).Class Actinopterygii (ray-finned .....
Found on http://www.britannica.com/eb/a-z/a/14

Actinopterygii

Actinopterygii is a division of bony fishes. The paired fins have broad bases and lack fleshy lobes. External nares are double, internal nares are absent. Scales are of the ganoid type.
Found on http://www.probertencyclopaedia.com/browse/BA.HTM

Actinopterygii

The Actinopterygii aɪ, or ray-finned fishes, constitute a class or subclass of the bony fishes. The ray-finned fishes are so called because they possess lepidotrichia or `fin rays`, their fins being webs of skin supported by bony or horny spines (`rays`), as opposed to the fleshy, lobed fins that characterize the class Sarcopterygii which als...
Found on http://en.wikipedia.org/wiki/Actinopterygii
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