सर्वात आदिम उपवर्ग प्रोटोथेरिया हा एकमेव सस्तन प्राणी आहे ज्यामध्ये अद्याप उपस्थित सदस्य आहेत,

Noun:

मॉन्ट्रीम,

monotremes's Usage Examples:

However, Icarops, a mainland Australian genus, shows adaptations to terrestriality, suggesting that it evolved prior to the colonisation of New Zealand, in an environment dominated by terrestrial mammals such as marsupials and monotremes.

is the natural method of birth for all mammals except monotremes, which lay eggs.

There are three extant subclasses of mammals, one being metatherians: monotremes: egg laying mammals like the platypus and the echidna, metatheria: marsupials.

Zalambdalestes had an epipubic bone, meaning it was probably restricted reproductively in the same way as modern monotremes and marsupials.

Discoidal cleavage is commonly found in monotremes, birds, reptiles, and fish that have telolecithal egg cells (egg cells with the yolk concentrated at one end).

Although it had some features similar to monotremes in the lumbar vertebrae.

reptiles, birds, and a few mammals (monotremes, tenrecs, golden moles, and marsupial moles) have this orifice, from which they excrete both urine and feces;.

Alongside the opal opalised fossils are also found, including those of dinosaurs and primitive monotremes.

crown mammals that contains a few fossils of the Mesozoic and the extant monotremes.

elephants, monotremes (platypus, echidna), marsupials, lagomorphs, hyenas, binturongs, sirenians, and cetaceans (whales, dolphins, and porpoises), among others.

The construction of the lower jaw differs from existing monotremes.

Platypoda is a suborder of monotremes including the duck-billed platypus and its extinct cretaceous ancestors.

The extant members (monotremes) developed the mammalian middle ear independently.

Synonyms:

prototherian, anteater, Ornithorhynchus anatinus, spiny anteater, platypus, egg-laying mammal, duckbilled platypus, duck-billed platypus, echidna, duckbill,

Antonyms:

beakless,