Share this entry

Share this page

prototherian

Line breaks: proto|ther¦ian
Pronunciation: /ˌprəʊtə(ʊ)ˈθɪərɪən
 
/
Zoology

Definition of prototherian in English:

noun

A mammal of the group Prototheria, which comprises the monotremes and their extinct relatives.
Example sentences
  • Extant mammals, including prototherians (egg-laying mammals) and therians (marsupial and placental mammals), probably last shared a common ancestor about 160 million years ago.

adjective

Back to top  
Relating to or denoting prototherians.
Example sentences
  • In his classification of prototherian mammals Hopson queried the allocation of Haramiyidae to the Multituberculata.
  • They had a common ancestor more recently than either had with the monotremes or, probably, any other prototherian group.

Definition of prototherian in:

Share this entry

Share this page

 

What do you find interesting about this word or phrase?

Get more from Oxford Dictionaries

Subscribe to remove ads and access premium resources

Word of the day peart
Pronunciation: pərt
adjective
lively; cheerful