A group of mammals that comprises the monotremes and their extinct relatives. Compare with Theria.
- Subclass Prototheria, class Mammalia.
- They are often placed in a separate subclass from other mammals, Prototheria.
- Triconodonta were viewed as broadly ancestral to the extinct Docodonta and to living monotremes, collectively grouped (often with Multituberculata) as Prototheria.
- As noted, recognition of skull resemblances to monotremes and triconodonts led to later referral to ‘Prototheria,’ within a monophyletic Mammalia.
Modern Latin (plural), from proto- 'first, original' + Greek thēr 'wild beast'.
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