Wed . 19 Jan 2019

Pilosa

pilosaurus, pilosa order
The order Pilosa is a group of placental mammals, extant today only in the Americas It includes the anteaters and sloths, including the extinct ground sloths, which became extinct about 10,000 years ago The name comes from the Latin word for "hairy"[2] Pilosans are good examples of ecological harmony Anteaters, for example, feed lightly and for a short time at any one ant nest, allowing the colony to regrow easily Also, sloths' fur is home to many insects, as well as a type of algae that helps camouflage the sloths[3]

Origins and taxonomy

The biogeographic origins of the Pilosa are still unclear,[4] but they can be traced back in South America as far as the early Paleogene about 60 million years ago, only a short time after the end of the dinosaur era The presence of these animals in Central America and their former presence in North America is a result of the Great American Interchange A number of sloths were also formerly present on the Antilles, which they reached from South America by some combination of rafting or floating with the prevailing currents

Together with the armadillos, which are in the order Cingulata, pilosans are part of the larger superorder Xenarthra, a defining characteristic of which is the presence of xenarthrals extra formations between lumbar vertebrae In the past, Pilosa was regarded as a suborder of the order Xenarthra, while some more recent classifications regard Pilosa as an order within the superorder Xenarthra Earlier still, both armadillos and pilosans were classified together with pangolins and the aardvark as the order Edentata meaning toothless, because the members do not have front incisor teeth or molars, or have poorly developed molars Edentata was subsequently realized to be polyphyletic; it contained unrelated families and was thus invalid

Classification

Restoration of the Shasta ground sloth, Nothrotheriops shastensis

Order Pilosa

  • Suborder Vermilingua
    • Family Cyclopedidae
      • Silky anteater, Cyclopes didactylus
    • Family Myrmecophagidae
      • Giant anteater, Myrmecophaga tridactyla
      • Northern tamandua, Tamandua mexicana
      • Southern tamandua, Tamandua tetradactyla
  • Suborder Folivora
    • Family Bradypodidae: three-toed sloths
      • Pygmy three-toed sloth, Bradypus pygmaeus
      • Brown-throated three-toed sloth, Bradypus variegatus
      • Pale-throated three-toed sloth, Bradypus tridactylus
      • Maned three-toed sloth, Bradypus torquatus
    • Family Megalonychidae: two-toed sloths and extinct megalonychid ground sloths
      • Hoffman's two-toed sloth, Choloepus hoffmanni
      • Linnaeus's two-toed sloth, Choloepus didactylus
    • Family †Megatheriidae: megatheriid ground sloths
    • Family †Mylodontidae: mylodontid ground sloths
    • Family †Nothrotheriidae: nothrotheriid ground sloths

References

  1. ^ Gardner, AL 2005 "Order Pilosa" In Wilson, DE; Reeder, DM Mammal Species of the World: A Taxonomic and Geographic Reference 3rd ed Johns Hopkins University Press pp 100–103 ISBN 978-0-8018-8221-0 OCLC 62265494 
  2. ^ Kidd, DA 1973 Collins Latin Gem Dictionary London: Collins p 248 ISBN 0-00-458641-7 
  3. ^ George A Feldhamer; Lee C Drickamer; Stephen H Vessey; Joseph F Merritt; Carey Krajewski 1 January 2015 Mammalogy: Adaptation, Diversity, Ecology JHU Press pp 343– ISBN 978-1-4214-1588-8 
  4. ^ A proposed clade, Atlantogenata, would include Xenarthra and early African mammals

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Pilosa


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    Pilosa beatiful post thanks!

    29.10.2014


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