Prototheria definitions

Prototheria

1) Class 2) Echidnas 3) Subclass prototheria
Found on https://www.crosswordclues.com/clue/prototheria

Prototheria (ə; from Greek πρώτος, prōtos, first, + θήρ, thēr, wild animal) is a taxonomic group, or taxon, to which the order Monotremata belongs. It is conventionally ranked as a subclass within the mammals. Most of the animals in this group are extinct. The egg-laying monotremes are known from fossils of the Cretaceous and Cenozoic ...
Found on http://en.wikipedia.org/wiki/Prototheria

Prototheria

• (n. pl.) Same as Monotremata.
Found on http://thinkexist.com/dictionary/meaning/prototheria/

Prototheria

(from the article `vertebrate`) ...bones; 12 pairs of cranial nerves; 4-chambered heart; young nourished by milk from mammary gland; internal fertilization; mostly viviparous, some ...
Found on http://www.britannica.com/eb/a-z/p/124

Prototheria

Pro`to·the'ri·a noun plural [ New Latin , from Greek prw^tos first + qhri`on , dim. of qh`r beast.] (Zoology) Same as Monotremata .
Found on http://www.encyclo.co.uk/webster/P/182