鲟鱼和长嘴鱼都是硬鳞鱼.Sturgeons and gars are ganoid.硬鳞鱼在更早的地质时期数量巨大.Ganoid fishes swarmed during the earlier geological periods.陆龟的背甲高而呈圆盖形;后肢粗大, 形如象腿;前肢覆以硬鳞.Tortoises have a high, domed shell, heavy elephant - like hind legs, and...

“硬鳞”的英语可以翻译为：[医] ganoid scale ...