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Figure 3. Representative monotreme (echidna; a,c) and marsupial (tammar wallaby; b,d) reproductive systems. In females (a,b) the ureters pass medially preventing fusion to form a single uterus as occurs in most eutherian mammals. In male monotremes (c) the testes are held within the abdominal cavity, whilst in most male marsupials (d) the testes descend into a scrotum (not shown) anterior to the penis.
Marsupials are an infraclass of mammals living primarily in Australasia and the Americas. A distinctive characteristic, common to most species, is that the young are carried in a pouch. Well-known marsupials include kangaroos, wallabies, the koala, possums, opossums, wombats and the Tasmanian devil.Other marsupials include the numbat, bandicoots, bettongs, the bilby, quolls, and the quokka. Marsupials represent the clade originating with the last common ancestor of extant metatherians.ven today, marsupials in many cases have 40 to 50 teeth, which is significantly more in comparison to placental mammals. There is a high number of incisors in the upper jaw, up to ten, and they have more molars than premolars.