鱼类是古老的脊椎动物。它们几乎栖居于地球上所有的水生环境——从淡水的湖泊、河流到咸水的大海和大洋。4.5 亿年前寒武纪时期出现在地球上有圆嘴无颌的鱼。鱼类很容易从外表上区分开来,它们组成了脊椎动物中最大的类群:在总数为5万种的脊椎动物中,鱼类有2万2千余种。鱼类的骨骼按性质分软骨和硬骨两类。
... 纤维性骨营养不良 osteofibrosis 硬骨鱼 bony fishes; Osteichthyes (taxonomic class including most fish) 鱼骨 fish bone ...
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鱼类斯钙素的研究进展 关键词 硬骨鱼,斯坦尼氏小体,斯钙素 [gap=859]key words teleost,corpuscles of stannius,stanniocalcin
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太阳鱼,又叫翻车鱼(Mola Mola)、棘臀鱼,是世界上已知的最大的硬骨鱼(bony fish),成年雄性平均重1吨,主要生活在热带和温带的海域中。
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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.
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.
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.
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