noun
bony fishes; Osteichthyes
Scientific term for the class of fish with bony skeletons, as opposed to cartilaginous fish. Used in biology and taxonomy.
硬骨類は、サメやエイなどの軟骨魚類と区別される。
Bony fishes are distinguished from cartilaginous fish such as sharks and rays.
軟骨魚類 refers to cartilaginous fish (Chondrichthyes), while 硬骨類 refers to bony fish (Osteichthyes).
From 硬骨 (hard bone) + 類 (class/group), a direct calque of the scientific term Osteichthyes.