Acanthopterygii :: Acanthopterygii (n. pl.) An order of fishes having some of the rays of the dorsal, ventral, and anal fins unarticulated and spinelike, as the perch..
Acanthopterygious :: Acanthopterygious (a.) Having fins in which the rays are hard and spinelike; spiny-finned.
Archipterygium :: Archipterygium (n.) The primitive form of fin, like that of Ceratodus..
Basipterygium :: Basipterygium (n.) A bar of cartilage at the base of the embryonic fins of some fishes. It develops into the metapterygium.
Chondropterygii :: Chondropterygii (n. pl.) A group of fishes, characterized by cartilaginous fins and skeleton. It includes both ganoids (sturgeons, etc.) and selachians (sharks), but is now often restricted to the latter..
Crossopterygian :: Crossopterygian (a.) Of or pertaining to the Crossopterygii.
Malacopterygii :: Malacopterygii (n. pl.) An order of fishes in which the fin rays, except the anterior ray of the pectoral and dorsal fins, are closely jointed, and not spiny. It includes the carp, pike, salmon, shad, etc. Called also Malacopteri..