The Placentalia (Eutheria) is by far the most diverse group of mammals. The Mammalia include extinct forms such as Morganucodontidae and Docodonta, plus the monotremes and marsupials and then of course the largest clade; the Placentalia.There are 140 extant families and 4475 extant species of mammal, of which 116 families and 4178 species belong the placentals. These families are divided into four Orders, the Afrotheria, the Xenarthra, the Euarchontoglires and the Laurasiatheria. For detailed discussions on each of these groups, click on the links below.
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Author: Emma-Louise Nicholls
Last updated: 20th November 2005
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