Actinopterygii - Ray-finned fish

Japanese: 条鰭類 - じょうきるい

Actinopterygii is a subclass of bony fishes. The Actinopterygii subclass is further divided into three superorders, Chondrostei (Chondrostei), Holostei (Holostei), and Teleostei (Teleostei), in order of primitiveness. The rays of the pectoral fin are attached to the coracoid and scapula of the shoulder girdle via the projections. Teleostei have thin scales, and are round or pectinate, whereas holostei and soft-finned fish have hard ganoine scales. As a rule, there are two nostrils on each side of the head. Actinopterygii are extremely diverse, and it is nearly impossible to list traits common to all species.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

硬骨魚類の1亜綱Actinopterygii。条鰭亜綱はさらに原始的な順に軟質類Chondrostei，全骨類Holostei，真骨類Teleosteiの三つの上目に分けられる。胸びれの鰭条は射出骨を介して肩帯の烏口（うこう）骨や肩甲骨に付着する。うろこは真骨類ではうすく，円鱗や櫛鱗（しつりん）であるが，全骨類や軟質類では硬鱗のガノイン鱗である。鼻孔は頭の片側に原則として2個ずつある。条鰭類はきわめて多様性に富み，全種に共通する形質を挙げることは不可能に近い。

出典　株式会社平凡社世界大百科事典第２版について　情報

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