1. adjective /ˌproʊtɵˈθɪəriən/
Belonging or pertaining to the subclass Prototheria of monotremes.

It is evident that the Edentates are widely separated from all other existing Eutherians; and Professor W. K. Parker, in view of the tendency to a variation in the number of cervical vertebræ and other features, has suggested a separate origin from a Prototherian stock.

2. noun /ˌproʊtɵˈθɪəriən/
Any of the egg-laying mammals of the subclass Prototheria; a monotreme.

Monotremes (prototherians), which include the duck-billed platypus, and short- and long-beaked echidnas, have a cloaca—a single opening for the fecal, urinary, and reproductive tracts.

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  • prototherian — /proh teuh thear ee euhn/, adj. 1. belonging or pertaining to the group Prototheria, comprising the monotremes. n. 2. a prototherian animal. [1880 85; < NL Prototheri(a) ( < Gk proto PROTO + thería, pl. of THERÍON beast) + AN] * * * …   Universalium

  • prototherian — n. & adj. n. any mammal of the subclass Prototheria, including monotremes. adj. of or relating to this subclass. Etymology: PROTO + Gk ther wild beast * * * noun primitive oviparous mammals found only in Australia and Tasmania and New Guinea •… …   Useful english dictionary

  • prototherian Zoology — [ˌprəʊtə(ʊ) θɪərɪən] noun a mammal of the subclass Prototheria, which comprises the monotremes and their extinct relatives. adjective relating to prototherians. Origin from mod. L. Prototheria, from proto + Gk thēr wild beast …   English new terms dictionary

  • Prototheria — Taxobox name = Prototherians fossil range = Early Cretaceous Recent image width = 200px image caption = Short beaked Echidna regnum = Animalia phylum = Chordata classis = Mammalia subclassis = Prototheria subclassis authority = Gill, 1872… …   Wikipedia

  • Morrison Formation — Stratigraphic range: Late Jurassic The distinctive banding of the Morrison Formation, a group of rock layers that occur throughout Dinosaur National Monument and the source of fossils like those found at the Dinosaur Quarry …   Wikipedia

  • Dry Mesa Quarry — View from the Dry Mesa Dinosaur Quarry overlooking Escalante Canyon The Dry Mesa Dinosaur Quarry is situated in southwestern Colorado, USA, near the town of Delta. Its geology forms a part of the Morrison Formation and has famously yielded a… …   Wikipedia

  • egg-laying mammal — noun the most primitive mammals comprising the only extant members of the subclass Prototheria • Syn: ↑monotreme • Hypernyms: ↑prototherian • Hyponyms: ↑echidna, ↑spiny anteater, ↑anteater, ↑ …   Useful english dictionary

  • mammalian — I noun any warm blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk • Syn: ↑mammal • Members of this Topic: ↑digitigrade, ↑plantigrade,… …   Useful english dictionary

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