Marsupials are believed to have diverged from placental mammals about 90 million years ago. TOPIC 9 15 families of Marsupials occur in Australia. 3 families of Marsupials occur in South America A Capuchin is a species Jump to navigation Jump to search. Marsupials used to occur throughout the world, but now only inhabit a few regions. Since then the two groups of mammals have evolved independently of one another. In contrast to the period covered by the second edition (Wilson and Reeder, 1993), however, systematic research on Rodentia since 1993 has been equally as prolific, multifaceted, and informative at taxonomic levels above the species and requires introductory comment. Some marsupial species are able to store sperm in the oviduct after mating. dentition The classification scheme used by Wilson and Reeder for marsupials, partly emphasizes structure of the ______. From Wikipedia, the free encyclopedia. No classification system is universally accepted; McKenna & Bell (1997) and Wilson & Reader (2005) provide useful recent compendiums. In terms of number of species — although not necessarily in terms of number of organisms (population) or biomass — rodents make up the largest order of mammals. Mammal classification has been through several iterations since Carl Linnaeus initially defined the class. Mammal classification has been through several iterations since Carl Linnaeus initially defined the class. No classification system is universally accepted; McKenna & Bell (1997) and Wilson & Reader (2005) provide useful recent compendiums. This canal can be transitory or permanent. The classification scheme used by Wilson and Reeder for marsupials, partly emphasizes structure of the _____. Modern marsupials originated in the Late Cretaceous and today include over 300 known species distributed across the Americas and Australasia (Wilson and Reeder 2005).These species vary from gliding possums to hopping kangaroos and include obligate carnivores, specialized insectivores, omnivores, and herbivores, and both diurnal and nocturnal forms. Mammal classification has been through several iterations since Carl Linnaeus initially defined the class. Mammals (formally Mammalia) are a class of vertebrate animals whose name is derived from their distinctive feature, mammary glands, with which they feed their young.They are also characterized by the possession of sweat glands, hair, three middle ear bones used in hearing, and a neocortex region in the brain.. Marsupials are generally characterized by the female having a pouch in which it rears its young through early infancy, as well as various reproductive traits that distinguish them from other mammals. The classification scheme used by Wilson and Reeder for marsupials, partly emphasized structure of the _____.