ANT203H5 Lecture Notes - Lecture 7: Tapetum Lucidum, Mandibular Symphysis, Strepsirrhini
Document Summary
Orders primates into prosimii (pre-monkeys) and anthropoidea (humans, apes, and monkeys) This does not accurately depict the proper evolutionary relationships between groups: tarsiers are more closely related to anthropoidea. Strepsirhini (lemurs) + haplorihinis (tarsiers, new world, old world) Traditional classification: prosimii polyphyletic (only similar traits, smaller bodies, grooming claws, unfused mandibular symphysis, mostly nocturnal, less social, anthropoidea paraphyletic, larger bodies & brains, no grooming claws, fused mandibular symphysis, mostly diurnal, more social. Cladistics classification monophyletic: strepsirrhini, haplorini. Incisors and canine are elongated: used for grooming and feeding, grooming claw (toilet claw, on the second toe on each foot, postorbital bar, ring of bone around the eye, not a full closure. Madagascar separated from africa about 160mya, before the evolution of most placental mammals. Mammals ancestral to lemurs made it to the island via rafting via on floating mats of vegetation between 62-65mya: or they made it on a now-gone land-bridge. Madagascar has extremely diverse fauna and flora.
