different between cercopithecin vs cercopithecid

English

cercopithecin (plural cercopithecins)

cercopithecid (plural cercopithecids)

(zoology) Any species of the family Cercopithecidae, the Old World monkeys.
- 2011, Terry Harrison, Chapter 6: Cercopithecids (Cercopithecidae, Primates), Terry Harrison (editor), Paleontology and Geology of Laetoli: Human Evolution in Context, Volume 2: Fossil Hominins and the Associated Fauna, page 134,
  More importantly, perhaps, is the observation that cercopithecids are significantly under-represented in the lowermost horizons of the Upper Laetolil Beds below Tuff 5.
- 2013, Meave G. Leakey, Mark F. Teaford, Carol V. Ward, 6.1: Cercopithecidae from Lothagam, Meave G. Leakey, John Michael Harris (editors), Lothagam: The Dawn of Humanity in Eastern Africa, page 202,
  In North Africa, cercopithecids assigned to the genus Prohylobates are known from two Early Miocene localities: Wadi Moghara, Egypt (Simons 1969), and Gebel Zelten, Libya (Delson 1979).

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