BIO 346 Lecture Notes - Lecture 22: Trichromacy, Internal Fertilization, Somatosensory System
Document Summary
340 mya - sexual touch (oldest form of affective touch) - internal fertilization in amniotes (group of animals that use internal fertilization: mammals, reptiles & birds) Birds = reptiles - sisters to mammals all together are amniotes. Amniotes - sister to amphibians (to include all tetrapods = four-limbed vertebrates) 140 mya - innovations of hearing (cochlea emergence), olfaction & maternal touch & suckling shared within mammals (modern) 20-30 mya - modifications of sensations associated with diurnality & sociality in. See differences in visual pathways (i. e. increase parvo) Olfaction - reduced size of olfactory structures & fewere receptor genes (increased rate of pseudogenes) Touch - use of affective touch in social groups. 1. 2 mya - improved discriminative touch in hands. 400 kya - improved hearing in range of speech, somatosensation of lips & tongue. Bonobos & chimps - groups mix & match over time. Units with 1 male multiple females (omu) Larger bands - many omus, bachelor males, forage together.
