Strepsirrhini or Strepsirhini is a suborder of primates that includes the lemuriform primates, Strepsirrhine primates produce their own vitamin C, whereas haplorhine primates must obtain it from their diets. of early primates and because they possessed adaptations to living in trees, such as a divergent big toe (hallux).May 16, 2011 When comparing primate suborders, we found only weak evidence for differences in traits between haplorhines and strepsirrhines, and .J Anat. 2010 Mar;216(3):368-80. doi: 10.1111/j.1469-7580.2009.01177.x. Epub 2009 Dec 21. Deep evolutionary roots of strepsirrhine primate labyrinthine .Dec 21, 2009 The cavity system of the inner ear of mammals is a complex three-dimensional structure that houses the organs of equilibrium and hearing.Darwinius is a genus within the infraorder Adapiformes, a group of basal strepsirrhine primates from the middle Eocene epoch. Its only known species, .