BIOLOGY 1M03 Chapter 12: Chap 12 HHE
7 Nov 2018
School
Department
Course
Professor
Document Summary
Thinner enamel, more rounded skulls, face is smaller with less protruding, jaws and jaw muscles reduced in size. Smaller brained individuals h. habilis; robust species with larger brains h. rudolfensis. Pleistocene started 1. 8mya with a cooling trend the last 6mya: ergaster. 1. 8 - 0. 6mya; evolved from early homo; found in kenya, ethiopia, tanzania, south africa; african. Skull differs from modern humans and earlier hominins. Human-like, derived: shorter and less prognathic face, taller skull, smaller jaws, postcanine teeth, reduction of roots in premolars. Earlier-hominins, ancestral: marked narrowing behind the eyes, receding forehead, no chin. Stuff not in hominins or humans: horizontal ridge at back of skull (occipital torus), large browridges. Adapted for life in a drier environment better adapted for tearing and biting and less to heavy chewing. Reduced sexual dimorphism males only 20-30% larger than females. Fullt(cid:455) (cid:272)o(cid:373)(cid:373)itted to life o(cid:374) grou(cid:374)d (cid:449)as the first ho(cid:373)i(cid:374)i(cid:374) that (cid:272)ould ru(cid:374) for lo(cid:374)g dista(cid:374)(cid:272)es: ergaster: tools and subsistence.
