Monotreme - Wikipedia
Monotremes (/ ˈmɒnətriːmz /) are mammals of the order Monotremata. They are the only group of living mammals that lay eggs, rather than bearing live young. The extant monotreme species are the platypus and the four species of echidnas.
Monotreme | Definition, Characteristics, Reproduction, Examples ...
Monotreme, any member of the egg-laying mammalian order Monotremata, which includes the amphibious platypus and the terrestrial echidnas of continental Australia, the Australian island state of Tasmania, and the island of New Guinea. It is the most ancient living order of mammals.
Monotreme Definition & Meaning - Merriam-Webster
2024年9月28日 · noun. mono· treme ˈmä-nə-ˌtrēm. : any of an order (Monotremata) of egg-laying mammals comprising the platypuses and echidnas. Examples of monotreme in a …
What is a Monotreme? Monotremes Explained - A-Z Animals
2023年4月13日 · Monotremes are members of the Monotremata suborder of prototherian mammals. Along with placentals and marsupials, they are one of the three subgroups of today’s living mammals. In addition to laying eggs, monotremes differ …
Monotreme - Definition, List, Examples, Characteristics, & Picture
2024年7月9日 · Monotremes are the only mammals that lay eggs to reproduce (oviparous), a form that diversified from the traditional live-bearing ones, which includes marsupials and eutherians. However, like other mammals, they possess body hair and mammary glands and are endothermic or warm-blooded.
12.31: Monotremes - Biology LibreTexts
Monotremes are mammals that reproduce by laying eggs. The only living monotreme species are the platypus and echidnas (see Figure below and Figure below ). They are found solely in Australia and New Guinea (an island not far from Australia).
What is a monotreme? - The Australian Museum
Ornithorhynchus anatinus, is a unique Australian species. Along with echidnas, platypus are grouped in a separate order of mammals known as monotremes, which are distinguished from all other mammals because they lay eggs. The platypus and echidna have both survived by occupying ecological niches.
Monotreme Definition and Examples - Biology Online Dictionary
2021年7月21日 · Monotremata is a subdivision of the class Mammalia characterized primarily by laying eggs rather than giving birth to live young. Mammals belonging to this group are commonly referred to as monotremes. The monotremes are a very unusual type of animal.
Monotremes: Incredible Mammals Who Lay Shelled Eggs
Monotremes are a special group of mammals who lay eggs instead of giving live birth. Monotremes are pretty rare – scientists only recognize a few living species – so many people have never heard of the term.
University of California Museum of Paleontology
Information about monotremes, including their evolution, characteristics, and examples of species.
Overview of the Animals Called Monotremes - ThoughtCo
2019年6月5日 · Monotremes (monotremata) are a unique group of mammals that lay eggs, unlike placental mammals and marsupials, who give birth to live young. Monotremes include several species of echidnas and the platypus.
19.1.15: Monotremes - Biology LibreTexts
2022年5月14日 · Monotremes are a small but remarkable group of mammals that consists of a single species of duckbill platypus (Ornithorhynchus anatinus) found in Australia and three (perhaps four) species of spiny anteaters (echidnas) found in Australia and New Guinea.
monotreme - Students | Britannica Kids | Homework Help
The name Monotremata means “one-holed.” This refers to the fact that, like reptiles and birds, both sexes have only one opening at the rear of the body, which is used for both reproduction and excretion. Monotreme eggs are protected by a soft, leathery shell, like the eggs of reptiles.
monotreme summary | Britannica
monotreme , Any of three living species of egg-laying mammals (order Monotremata): the platypus and two species of echidna. Monotremes are found only in Australia, Tasmania, and New Guinea. Except for their egg laying, they have mammalian characteristics, such as mammary glands, hair, and a complete diaphragm.
Monotremes - Encyclopedia.com
2018年5月23日 · Monotremes are an ancient group of mammals in the order Monotremata, which probably split from the lineage leading to marsupials (those with no placenta and having a pouch in the abdomen) and placental mammals early in mammalian evolution. The earliest fossil occurrence of monotremes is in the lower Cretaceous, approximately 110 million years ago.
Monotremes ( Read ) | Biology - CK-12 Foundation
Monotremes are mammals that reproduce by laying eggs. The only living monotreme species are the platypus and echidnas (see Figure below and Figure below). They are found solely in Australia and New Guinea (an island not far from Australia).
Monotreme - New World Encyclopedia
Monotreme (monos, single + trema, hole) means "single opening" in Greek, and comes from the fact that their urinary, defecatory, and reproductive systems all open into a single duct, the cloaca. Other mammal females have separate openings for reproduction, urination, and defecation.
MONOTREME Definition & Meaning - Dictionary.com
noun. any mammal of the primitive order Monotremata, of Australia and New Guinea: egg-laying toothless animals with a single opening (cloaca) for the passage of eggs or sperm, faeces, and urine. The group contains only the echidnas and the platypus.
monotreme noun - Definition, pictures, pronunciation and usage …
Definition of monotreme noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
Definition, Habitat, Lifespan, Species, & Facts - Britannica
2024年9月24日 · Echidnas probably evolved from some unknown monotreme ancestor during the Paleogene Period (66 to 23 million years ago). Echidnas’ lack of teeth has hampered study of their evolutionary history, because teeth fossilize well and often help to determine relationships between mammals.
12.23: Monotremes - K12 LibreTexts
2023年8月11日 · Monotremes are mammals that reproduce by laying eggs. The only living monotreme species are the platypus and echidnas (see Figure below and Figure below). They are found solely in Australia and New Guinea (an island not far from Australia).
ADW: Monotremata: INFORMATION
Monotremes are endothermic, but they have unusually low metabolic rates and maintain a body temperature that is lower than that of most other mammals. The eggs layed by monotremes are small (13-15 mm diameter) and covered by a leathery shell.
Monotreme - Definition, Meaning & Synonyms - Vocabulary.com
noun. the most primitive mammals comprising the only extant members of the subclass Prototheria. synonyms: egg-laying mammal. see more. a burrowing monotreme mammal …