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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.
A primitive mammal that lays large yolky eggs and has a common opening for the urogenital and digestive systems. Monotremes are now restricted to Australia and New Guinea, and comprise the platypus and the echidnas. âPlacental and marsupial mammals are more closely related to one another than to the third living group of mammals, the monotremes.â. âThere are only three living monotremes, the duck-billed platypus and two species of echidna, or âspiny anteatersâ, such as the one shown at right.â.