Prototheria (/ ˌproʊtəˈθɪəriə, - toʊ -/, PROH-toh-THEER-ee-ə; [1] from Ancient Greek πρώτος prṓtos "first" and θήρ thḗr "wild animal") is an obsolete subclass of mammals which includes the living Monotremata and to which a variety of extinct groups, including Morganucodonta, Docodonta, Triconodonta and Multituberculata, have also been assigned.

Pro­tothe­ri­ans are ei­ther ter­res­trial (Tachy­glos­si­dae) or pri­mar­ily aquatic (Or­nithorhynchi­dae). Their ter­res­trial habi­tats in­clude deserts, sandy plains, rocky areas, and forests in both low­lands and moun­tains.

Prototheria (Egg laying mammals) 1. Ear without pinna. 2. No nipple. 4. Testes abdominal, no scrotum. 5. Digestive and urinogenital tracts open out through cloaca and cloacal aperture. 6. No marsupial pouch. 7. Oviparous. 8. No placenta. ii. Metatheria (Pouched mammals or marsupials) 1. Ear with pinna. 2. Nipples abdominal. 3. No corpous callosum

The subclass Prototheria contains the egg-laying mammals, which are the most ancestral forms in the class Mammalia. There are only five extant species grouped into two families and a single order, the Monotremata.

proboscidean, (order Proboscidea), any of the group of mammals that includes elephant s and their extinct relatives such as mammoth s and mastodon s. Although only three species of elephant are extant today, more than 160 extinct proboscidean species have been identified from remains found on all continents except Australia and Antarctica.

The Prototheria is a former subclass of mammals, now no longer in use. The name comes from Greek prōtos means 'first', and thēr , 'beast'. The only surviving animals in this subclass are the Monotremes .

2018年5月18日 · Prototheria A subclass of mammals – the monotremes – that lay large yolky eggs. It contains only the duckbilled platypus and the spiny anteater. After hatching, the young feed on milk from simple mammary glands inside a maternal abdominal pouch.

Prototheria (/ ˌ p r oʊ t ə ˈ θ ɪər i ə,-t oʊ-/, PROH-toh-THEER-ee-ə; [1] from Ancient Greek πρώτος prṓtos "first" and θήρ thḗr "wild animal") is an obsolete subclass of mammals which includes the living Monotremata and to which a variety of extinct groups, including Morganucodonta, Docodonta, Triconodonta and ...

Prototheria. Identification Numbers. TSN: 179914. Geography. Working with others to conserve, protect and enhance fish, wildlife, plants and their habitats for the continuing benefit of the American people. Footer Menu - Employment. Careers & Internships; Contracting; Footer Menu - …

2022年2月6日 · What is Prototheria subclass and what are the species in it? The term ‘Prototheria’ is the term given to the subclass of the class Mammalia in the Animal Kingdom. This subclass is the oldest form of the Mammalian class. The animals in this group are mostly extinct.