ANTHROP 3304 Lecture Notes - Lecture 6: Mandibular Symphysis, Callitrichidae, Mating System
15 Feb 2018
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Lecture: february 9: anthropoids, features, larger, diurnal, no tapetum, more orbital frontation, shorter snout, more conservative teeth, larger brain, fused frontal bones and mandibular symphysis, postorbital closure, nails on all digits. Platyrrhines: from word meaning flat-nosed , flat nose with widely spaced, oval nostrils, general features, small to medium sized, dental = 2. 1. 3. 3, arboreal, some have prehensile tails, callitrichinae, beautiful hair , marmosets and tamarins, features. Long tails but not prehensile: diurnal, upper 1st molar with only 3 cusps, dental = 2. 1. 3. 2 (lost a molar, claws, marmosets = chisel-like incisors, gumivorous, mating system need not be synonymous with social system. Sometimes in multimale, multifemale group but only one individual breeds. Twins = help provided by subadults, juveniles and several adult males: negative effects of helping, delays reproduction of helpers (or causes permanent sterility, donations of food to young (nutritional sacrifice) Increased chance helper will get injured while protecting young: adaptive significance for non-reproductive callitrichines.
