gnathostome信息详情
有颌类
chaetognatha wikipedia───毛颚动物维基百科
endognath───内颚
chaetognath───adj.毛颚类动物的(等于chaetognathan);n.[无脊椎]毛颚类动物
mesognathous───adj.中型颚的
chaetognatha definition───毛颚动物定义
chaetognatha habitat───毛颚动物栖息地
chaetognatha video───毛颚动物视频
entognathous hexapods───内颚六足
prognathous───adj.下巴突出的
macrognathic───巨颌的
Chondrichthyes (sharks, rays and chimaeras) account for only 2% of gnathostome species, the Osteichthyes accounting for the other 98%.───软骨鱼类(鲨鱼、鳐、银鲛)仅占有颌类物种数的2%,其余98%的有颌类都属于硬骨鱼类。
The gnathostome condition, with paired nasal sacs not associated with a through duct, would therefore be a derived condition.
Chondrichthyes (sharks, rays and chimaeras) account for only 2% of gnathostome species, the Osteichthyes accounting for the other 98%.
The acquisition of many gnathostome characters occurred through several transformation series which can be traced across the phylogeny of agnathans.