What is another word for prototheria?
Pronunciation: [pɹˌə͡ʊtə͡ʊθˈi͡əɹɪə] (IPA) 
Prototheria is a term used to describe a group of mammals that lay eggs, also known as monotremes. Synonyms for prototheria include the subclass Monotremata and the order Monotremata. The word prototheria comes from the Greek words "proto" meaning "first" and "theria" meaning "beast," reflecting the unique evolutionary history of monotremes as the earliest branch of mammals to diverge from the rest. While there are only five extant species of monotremes, they are some of the most fascinating and iconic animals in the world, including the platypus and echidnas. Despite their limited diversity, monotremes provide a unique and valuable window into the evolutionary history of mammals.
