硬骨鱼系先前公认的硬骨鱼系的层级不是一个单源的群。它现在有专门的地位，包括像鱼一样的肉鳍次亚纲与条鳍次亚纲。

Osteichthyes the formerly recognized class Osteichthyes is not a monophyletic group. It now has the status of a vernacular to include the fish-like Sarcopterygii and the actinopterygians.

对每种细胞类型的超微结构特征作了详细描述，并与其他硬骨鱼的相应细胞作了比较讨论。

The ultra structure features of each cell type are described in detail, and discussed in comparison with the homologous cells described in other teleosts.

一般是经由鳃呼吸。大部分硬骨鱼有鳔，这是源于消化管的憩室，司控制浮力或为辅助呼吸器官。

Fish generally respire through gills. most bony fish es have a swim bladder a gas-filled organ used to adjust swimming depth.

鲟鱼是硬骨鱼系中一类古老的类群，由于具有极高的营养价值而倍受人们的青睐，经济价值较高。

Acipenser is an old fish group in Osteichthyes because it finds favour in people 's eyes with high not only nutrition but economic value.

许多原始生物灭绝，鲨鱼和硬骨鱼成为水域的主人，四足动物最终进化成了恐龙和哺乳动物，征服了陆地。

Many primitive lineages went extinct as sharks and bony fish became masters of the waters and tetrapods, the four-legged animals that eventually evolved into dinosaurs and mammals, conquered the land.