Platypus ornithorhynchus anatinus
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Platypus Ornithorhynchus anatinus. Whitney Gunn David Coleman John Rice. Platypus Facts. Common Name: Platypus Scientific Name: Ornithorhynchus anatinus They live for about 10 to 15 years Natural habitat is East Australia and New Guinea Carnivorous diet Call sound. History.

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Platypus ornithorhynchus anatinus l.jpg

PlatypusOrnithorhynchus anatinus

Whitney Gunn

David Coleman

John Rice


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Platypus Facts

  • Common Name: Platypus

  • Scientific Name: Ornithorhynchus anatinus

  • They live for about 10 to 15 years

  • Natural habitat is East Australia and New Guinea

  • Carnivorous diet

  • Call sound


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History

  • Estimate of the Monotremes-Theria divergence, time range between 160 and 120 Myr ago.

  • The red line shows these are small mammals that developed hair, lactation, and homoeothermic.


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Characteristics

  • Has spurs on its hind feet

  • Platypus is one of the few venomous mammals.

    • The male platypus can delivers a poison through a spur on its hind foot.

  • Adults do not have teeth

    • Baby platypus are born with teeth this may be due to a “throwback” from its ancestors. Once they lose them they do not grow new teeth back.

    • Adults do not need teeth because they use horny pads to grind their food.


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    Characteristics

    • The have no true stomachs

    • Female platypus lay eggs

      • She lays 1-3 eggs, which she incubates between her abdomen and tail.

  • Lactation

    • The female platypus do not have nipples, so it’s young ones suck milk from patches on the abdomen



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    Evolution

    • Protamine P1 protein sequence


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    Evolution

    Distance matrix DNA

    P

    Phylogenetic tree showing the relationships between monotremes, marsupials, and mammals


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    Venomous Trait

    • The venom is made up of at least 19 different substances


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    Lactation and Eggs

    • It has been proposed that early lactation evolved as a water source to protect porous parchment-shelled eggs from desiccation during incubation or as a protection against microbial infection.

    • Parchment-shelled egg-laying monotremes also exhibit a more ancestral glandular mammary patch or areola without a nipple that may still possess roles in egg protection


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    Similarities

    • Both are only found in Australia and New Guinea

    • Monotreme means "one-holed," referring to the cloaca, a single hole that serves the urinary tract, anus, and reproductive tract in monotremes.

    • Both lay eggs


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    Differences

    • Echidna

      • Has a point snout

      • Pointy spines on coat

    • Platypus

      • Has duck like bill

      • Short dark brown fur


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    Further Studies

    • Recently scientist have been taking the platypus genome and comparing it to humans.

    • A study on why they secret milk through their abdominal muscles instead of through nipples would be helpful to further understand its evolutionary process.


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    References

    • http://assets0.pubget.com/pdf/8269934.pdf

    • http://www.nature.com/nature/journal/v453/n7192/pdf/nature06936.pdf


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    Picture Sources

    • http://soer.justice.tas.gov.au/2003/image/559/ilw/p-platypus_m.jpg

    • http://www.nature.com/nature/journal/v453/n7192/pdf/nature06936.pdf


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