哺乳纲

THE ARAGONIAN VERTEBRATE FAUNA OF XIACAOWAN , JIANGSU ——4 . GLIRIDAE ( RODENTIA, MAMMALIA )

江苏泗洪下草湾中中新世脊椎动物群—— 4。 睡鼠科 （ 哺乳纲， 啮齿目 ）

All are members of the Proboscidea order of mammals.

以上均是哺乳纲长鼻目的成员。

Ground sloths are a diverse group of extinct sloths, in the mammalian superorder Xenarthra.

地懒是已经灭绝的树懒的一个子类，属哺乳纲贫齿目。

By using the concept of ´germinal epithelium´, the researches on the gonadal development of Pisces, Aves and Mammalia were unifying to some extent then their characters were convenient for compared.

使用“生殖上皮”这一概念，一定程度上将鱼纲和鸟纲，哺乳纲的性腺发育统一起来，便于比较它们的异同。

Experts agree that hippos belong to the mammalian order artiodactyla, a group of even - toed, hoofed creatures whose extant representatives include camels, pigs and ruminants such as cows.

哺乳纲中的偶蹄目动物，是因四肢的蹄为偶数而得名，现存于世界上的包括了牛这类反刍动物，以及骆驼和猪等。