Definition of Prototheria in English:

Prototheria

Syllabification: Pro·to·the·ri·a
Pronunciation: /ˌprōtəˈTHirēə
 
/
Zoology
  • A group of mammals that comprises the monotremes and their extinct relatives. Compare with Theria.
    • Subclass Prototheria, class Mammalia
    More example sentences
    • 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.

Origin

modern Latin (plural), from proto- 'first, original' + Greek thēr 'wild beast'.

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