Subclass Prototheria Order Monotremata
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| Location of Monotremata | Australia and New Guinea
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| Ancestral Traits of Monotremata | Ovipary; No corpus callosum; Cloaca
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| Primitive Traits of Monotremata | Cervical ribs; Low body temperature and unstable; Epipubic bones; Reptile like testes and sperm; Pectoral girdle with coracoid bone, precoracoid bone, and interclavicle bones
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| Mammalian Traits of Monotremata | Hair; Mammary glands with no nipple; Dental-squamosal articulation; Three ear bones; Left aortic arch with four chamber heart
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| Distinctive Traits of Monotremata | No adult teeth (dentate); Abdominal testes with no scrotum; Baculum; K-selected; No vibrissae
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| Reproductive Traits of Monotremata | Small eggs; 10-11 days of incubation; Only left ovary sheds eggs
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| Family Tachyglossidae | Echidnas/Spiny anteaters; Myrmecophagy; Spurs with no venom; Pouch with a single young
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| Family Ornithorhynchidae | Duck billed platypus; Aquatic; Feed on invertebrates; Beak with nerve endings; Venom in spur; No pouch, burrow for eggs
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LionsandGiants
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