Monotremata

MonotremataBonaparte, 1837

Accepted name, Mammal Species of the World 2005

Reviewed by Griffiths (1978). The order is the sole extant representative of the Subclass Prototheria (all other living mammals belong to subclass Theria). McKenna and Bell (1997) divided the order into two (Platypoda and Tachyglossa); the date of divergence of the two living families is unknown, and conservatively they are retained here in a single order.

• Wilson, D and Reeder, D. (eds.) 2005. Mammal Species of the World. A Taxonomic and Geographic Reference. 3rd ed. -- 2142 pp. Johns Hopkins University Press.