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Malacopterygii A name now little used, describing the group (superorder) comprising the ‘lower’ bony fish (Osteichthyes), characterized by the possession of only soft-rayed fins (no spines), often single dorsal and adipose fins, both dorsal and pelvic fins located roughly midway along the back and belly profile, and the pectorals set low on the body. The ‘higher’ bony fish are usually grouped as the Acanthopterygii.