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HASH : 74839a5d389be31f498d385dec54322f
La langue: Anglais/Franc
Note moyenne : 4.61/56 (sur 25 notes)
Résumé :
thesaurusantonymsrelated wordssynonymslegend:switch to new thesaurus noun1.monotreme - the most primitive mammals comprising the only extant members of the subclass prototheriaegg-laying mammalprototherian - primitive oviparous mammals found only in australia and tasmania and new guineaechidna, spiny anteater, anteater - a burrowing monotreme

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Critiques, Analyses et Avis (8)
sarahauger
monotremes differ from other mammals in that they have a single opening for their urinary, digestive and reproductive tracts (this single opening is known as a cloaca and is similar to the anatomy of reptiles). monotremes lay eggs and like other mammals lactate (produce milk) but instead of having nipples like other mammals, monotremes secrete milk through mammary gland openings in the skin. adult monotremes do not have any teeth.
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sarahauger
the fact that monotremes lay eggs is not the only factor that distinguishes them from other mammal groups. monotremes also have unique teeth that are thought to have developed independently of the teeth that placental mammals and marsupials have (even though the teeth may be convergent evolutionary adaptations due to similarities). monotremes also have an extra set of bones in their shoulder (the interclavicle and coracoid) which are missing from other mammals.
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sarahauger
at present, sequencing of the whole genome of more than 100 mammalian species, including marsupial and monotreme species is available as well as that of many other vertebrate species including reptiles, birds and fish.mammalian-specific genomic functions: newly acquired traits generated by genomic imprinting and ltr retrotransposon-derived genes in mammalsof the 17 major groups of mammals, australia has only five native groups: monotremes, marsupials, bats, rodents, and seals.australia's animalsthese two biological traits are so rare in mammals that scientists classify the platypus, (along with one other aussie animal in the world, the echidna) as monotremes (meaning "one hole").australia's amazing animalson the counterfactual view, though, platypus refers to platypuses in virtue of the platypus-platypus law: the laws connecting monotremes, vertebrates and so on with platypuses are semantically secondary.mad dog nativismmonotremes are the obvious choice for future research as all other extant outgroups to the theria are distantly related.comparative patterns of craniofacial development in eutherian and metatherian mammalsthe platypus belongs to a very small group of mammals called the monotremes.platypus genome reveals evolutionary path that gave mammals reproductive edge, stanford scientist saysmonotremes and marsupials (de wilson y ra mittermeier, eds.nuevos registros de glironia venusta thomas, 1912 (mammalia, didelphidae) en el suroriente de ecuador11,12] in amphibians, reptiles, and monotremes three distinct parts of the coracobrachialis muscle are described: (1) coracobrachialis brevis (profundus), which is inserted into the humerus superior to tendon of latissimus dorsi; (2) coracobrachialis medius (proprius), which is inserted into the humerus inferior to tendon of latissimus dorsi; and (3) coracobrachialis longus (superficialis) or wood's muscle, which extends inferiorly on the shaft of humerus bridging the median nerve and brachial artery.a study on variation in the insertion of coracobrachialis muscle and its clinical importancelead author phd candidate rebecca pian said that the monotremes (platypuses and echidnas) are the last remnant of an ancient radiation of mammals unique to the southern continents.largest known platypus' fossil found in oznow, unless very stringently protected by law, and by the force of an awakened public opinion, alive to its own interest in doing so, the remainder of our marsupial species, with the monotremes are doomed to extinction.eighty years ago: survival of faunathe monotremes diverged from other primitive mammals about 166,000,000 years ago, in the late jurassic period--a fact corroborated indirectly in the newly sequenced genome.platypus unlocks evolution's secretswhich pair of animals are the only monotremes alive today?no-sweat bubble test
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sarahauger
▲monostoticmonostotic fibrous dysplasiamonostratalmonostrutmonosubstitutedmonosulfirammonosymptomaticmonosymptomatic demyelinating diseasemonosymptomatic enuresismonosymptomatic tabesmonosynapticmonosynaptic reflexmonosyphilidemonotardmonoterpenemonoterpenesmonoterpenoid dehydrogenasemonoterpenolsmonothematic delusionmonotherapymonothermiamonotocousmonotonic sequencemonotrematamonotrememonotremesmonotrichamonotrichousmonotrimmonotropymonotypemonotypicmonounsaturatedmonounsaturated fatmonounsaturated fatty acidmonounsaturated fatty acidsmonovalencemonovalentmonovalent antiserummonovalent vaccinemonovisionmonovularmonovular twinsmonovulatorymonoxenicmonoxenic culturemonoxenousmonoxidemonozoicmonozygoticmonozygotic twins▼
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sarahauger
monotremata is the most ancient living order of mammals. in addition to being egg layers (oviparous), members of this order share primitive skeletal features such as the shoulder girdle and skull characteristics that have been lost in other living mammals. relationships to other mammalian groups have been difficult to determine because of the puzzling combination of primitive features and specialized characteristics, a phenomenon known as mosaic evolution. certain features of the skull appear to link monotremes to the extinct early mammal groups. other evidence, particularly genetic data, places monotremata close to more-advanced mammals, namely marsupials.
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sarahauger
monotremes are very highly modified for their particular ecological niches. the platypus is a semiaquatic carnivore-insectivore, and the echidnas have a specialized diet of small invertebrates such as ants, termites, and worms. the name monotremata means “one-holed,” in reference to the fact that both sexes have only one opening at the rear of the body, which is used for both reproduction and excretion.
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sarahauger
various mammals of the mesozoic era (251 to 65.5 million years ago) with more-advanced shoulder girdles (including a multituberculate) have recently been discovered, indicating that the monotreme shoulder girdle developed before the shoulder girdles of some other mammalian groups. none of the theories of monotreme relationships has been universally accepted, although the subject is of great interest to scientists who study mammalian evolution.
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sarahauger
many researchers agree that the primitive features in monotremes reflect an ancient origin. any attempt to determine the relationships of monotremes must take into account these primitive retentions. this is problematic in that either these archaic features reflect an origin far removed from that of living placental and marsupial mammals or else a mechanism must be found to explain how these features could be possessed by a group that is closely related to mammals without these traits.
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