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Prototheria

(class Mammalia) A subclass that comprises the extinct orders Docodonta, Triconodonta (although their inclusion in the subclass is controversial), and Multituberculata, as well ...

Prototheria

Prototheria   Quick reference

A Dictionary of Zoology (4 ed.)

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Life Sciences
Length:
73 words

... (class Mammalia) A subclass that comprises the extinct orders Docodonta , Triconodonta (although their inclusion in the subclass is controversial), and Multituberculata , as well as the order Monotremata , members of which (platypus and echidnas) still survive. Prototherians are distinguished from therians mainly by the skull wall, which in prototherians has a small squamosal and alisphenoid , and by their teeth. The two subclasses began to diverge from a common stock during the late Triassic . ...

Prototheria

Prototheria   Quick reference

A Dictionary of Biology (7 ed.)

Reference type:
Subject Reference
Current Version:
2015
Subject:
Science and technology, Life Sciences
Length:
92 words

... 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. In the anteater the eggs are also incubated in this pouch, while the platypus builds an underground nest. Adult monotremes have no true teeth. Their skeleton resembles that of a reptile, and although they are warm-blooded the body temperature is somewhat variable. They are believed to have originated at least 150 million...

Prototheria

Prototheria   Reference library

The New Oxford Dictionary for Scientific Writers and Editors (2 ed.)

Reference type:
Subject Reference
Current Version:
2009

... (cap. P) A subclass of primitive mammals containing a single order, *Monotremata . Individual name and adjectival form: prototherian (no...

Prototheria

Prototheria noun   Quick reference

Oxford Dictionary of English (3 ed.)

Reference type:
English Dictionary
Current Version:
2015
Subject:
English Dictionaries and Thesauri
Length:
58 words

... / ˌprəʊtə(ʊ)'θɪərɪə / ▶ plural noun Zoology a group of mammals that comprises the monotremes and their extinct relatives . Compare with Theria . ● Subclass Prototheria , class Mammalia . group of mammals that comprises monotremes and their extinct relatives taxonomic animal group Zoology Mammal Prototheria Prototherium – origin modern Latin (plural), from proto- ‘ first, original ’ + Greek thēr ‘ wild beast ’...

Prototheria

Prototheria   Quick reference

New Oxford American Dictionary (3 ed.)

Reference type:
English Dictionary
Current Version:
2015
Subject:
English Dictionaries and Thesauri
Length:
54 words

... / ˌprōdə'THirēə / Zoology a group of mammals that comprises the monotremes and their extinct relatives . Compare with Theria . [ Subclass Prototheria , class Mammalia . ] group of mammals that comprises monotremes and their extinct relatives taxonomic animal group Zoology Mammal Prototheria – origin modern Latin (plural), from proto- ‘ first, original ’ + Greek thēr ‘ wild beast ’...

Prototheria

Prototheria  

(class Mammalia)A subclass that comprises the extinct orders Docodonta, Triconodonta (although their inclusion in the subclass is controversial), and Multituberculata, as well as the order ...
Theria

Theria  

(superclass Gnathostomata, class Mammalia)A subclass that comprises the three infraclasses Pantotheria (extinct ancestral forms), Metatheria (marsupials), and Eutheria (placental mammals), ...
Metatheria

Metatheria  

(class Mammalia, subclass Theria)An infraclass that comprises the marsupials and their extinct relatives, sometimes included in the single order Marsupialia and now more usually divided into several ...
Docodonta

Docodonta  

(class Mammalia, subclass Prototheria)An extinct order of primitive mammals, known only from teeth found in Late Jurassic rocks. Their brains may have been larger than those of reptiles; probably ...
Tachyglossidae

Tachyglossidae  

; subclass Prototheria, order Monotremata)A family of insectivorous monotremes, now recognized as being more closely related to the placental mammals (see Eutheria) than to the platypus (see ...

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