Subclass Theria Infraclass Metatheria
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Location of Metatheria | Neotropics, South America, Australia
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Traits of Metatheria | Simple placenta; Two vaginae; No cloaca; Angular mandible; Half to permanent pouch; Vipricious; Teeth; Altricial young; Scrotum before penis; Low metabolic rate; Narrow ecological range; No baculum
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Dentition of Metatheria | Polyprotodont have multiple lower incisors; Diprotodont two lower incisors straight out
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Digits of Metatheria | Nonsyndactylous with no fusion; Syndactylous with 2nd and 3rd digits fused in sheath
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Historical Zoogeography of Metatheria | North America first, to Europe, and independent in Australia and Antarctica
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Order Didelphimorphia | New world opossums; 87 spp; South America; Polyprotodont and Didactylous; Primitive dental; Absent-well developed pouch; Pentadactyl; Hairless prehensile tail; Narrow brain case
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Order: Didelphimorphia Family: Caenolestidae | Shrew and Rat Opossums; Small diversity; Western South America, dense forests at high elevation; Diprotodont and didactylous; Insectivores
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Order: Microbiotheria Family: Microbiotheriidae | Monito del Monte/Colocolos; High Andes in Chile; Polyprotodont and didactylous; Invertebrate feeding; Arboreal; Fat storage in tail for hibernating that can double mass; Seen as bad luck
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Order: Dasyuromorphia Family: Myrmecobiidae | Numbat; Australia; Myrmecophagous up to 10,000-20,000 a day; Polyprotodont and didactylus; Tongues are 10 cm out of mouth; Supernumerary (52), the largest number; Endangered for habitat loss and predation by introduction of red foxes
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Order: Dasyuromorphia Family: Dasyuridae | Tasmanian devil-marsupial mouses; Australia; Five toes on manus and 4-5 on pes; Insectivores and carnivores; Poorly developed marsupiums; Carnassial teeth; Tasmanian is largest extant carnivorous marsupial, is endangered because of contagious face cancer
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Order: Diprotodonta | Kangaroos, wombats; Huge diversity; Australia; Diprotodonta and syndactylous; Schizodactylous feet in arboreal species with 1st two toes opposing last 3, large toe on back feet; Herbivores mostly; Complete with livestock, are hunted.
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Order: Notoryctemorphia Family: Notoryctidae | Marsupial moles; very small diversity; Only complete fossorial marsupials; No eyes or ears; Fusiform bodies; Moth and beetle eggs and larvae; Well developed marsupium; Swim through soil; Nasal guard
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Order: Peramelemorphia Family: Peramelidae | Bandicoot; Australia and New Guinea; Chorioallentoic placenta with no villi; highest reproduction rates in marsupials; Omnivores
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Order: Peramelemorphia Family: Thylacomyidae | Bilibies; Australia and New Guinea; Highest reproduction rates in marsupials; Omnivores
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