Marsupialia
Marsupialia (noun) A taxonomic order of mammals, coextensive with the subclass Metatheria. Members of this group are characterized primarily by giving birth to relatively undeveloped live young, which then typically complete their development in a maternal pouch (marsupium).
The term is used in formal, scientific contexts such as zoology, biology, and taxonomy to classify a major group of mammals. * The order Marsupialia includes kangaroos, koalas, and opossums. * Fossil evidence suggests that Marsupialia was once more widely distributed across the globe. * A key distinguishing feature of Marsupialia is the presence of a pouch in most species.
- In phylogenetic classification, Marsupialia is often considered synonymous with the broader subclass Metatheria, which includes all extinct and extant marsupials and their ancestors.
- Marsupial (noun/adjective): The common term for any member of the Marsupialia. As an adjective, it describes characteristics of this group (e.g., marsupial pouch).
- Metatheria (noun): The subclass that is coextensive with Marsupialia, used in a more technical taxonomic ranking.
- Pouched mammals (common descriptive term, not a scientific synonym)
The word Marsupialia has a single, specific scientific meaning and is not used in general English with different definitions.
- coextensive with the subclass Metatheria