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Accessory Structures of the Skin: Nails01:05

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Nails are one of the important accessory structures of the skin. They are hard, protective structures that cover the dorsal surface of the distal phalanges of fingers and toes. Nails are composed of specialized keratinized cells and serve various functions, including protection, sensation, and manual dexterity.
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Do saki monkeys possess a grooming claw?

Constanze Ohlendorf1,2,3, Eckhard W Heymann2

  • 1Soziobiologie/Anthropologie, Georg-August-Universität Göttingen, 37077 Göttingen, Germany.

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|September 30, 2020
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Saki monkeys (Pithecia) may possess grooming claws on their second toes, a trait common in Strepsirrhini and tarsiers. This nail modification appears across various Pithecia species but isn't found in every individual.

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Area of Science:

  • Primatology
  • Comparative anatomy
  • Evolutionary biology

Background:

  • A grooming claw on the second toe is a defining feature of Strepsirrhini and tarsiers.
  • Evidence suggests grooming claws may also be present in Platyrrhini (New World monkeys).

Purpose of the Study:

  • To investigate the presence and characteristics of modified nails on the second toe in saki monkeys (genus Pithecia).
  • To determine if grooming claws or similar structures are present in Pithecia species.

Main Methods:

  • Qualitative observational study of nail morphology on the second toe across different species within the genus Pithecia.

Main Results:

  • Observations indicate that a grooming claw or a grooming claw-like nail is present in various Pithecia species.
  • The presence of this modified nail is not consistent across all individuals within the studied Pithecia species.

Conclusions:

  • The findings suggest that grooming claws or analogous structures are present in the genus Pithecia.
  • This trait's variable occurrence within Pithecia highlights potential diversity in primate nail morphology and evolution.