ANT 350 Lecture Notes - Lecture 24: Cladogenesis, Dwarfism, Liang Bua
Document Summary
Ergasters migrate within africa (swartkrans 1. 8/1. 6) and into asian tropics. Why migrate now: maybe because they could: increased body size w\ elongated pelvic limbs linear body build. Problems: heat loss, sweating, hair loss, dark pigmentation, moisture retention, nose. Ergasters = better moisture conservation, efficient heat loss system. Ergasters = lo(cid:374)ger legs efficie(cid:374)t loco(cid:373)otio(cid:374) (e(cid:448)ide(cid:374)ce of greater (cid:373)uscular activity) Supposedly lacks erectine apomorphies sagittal keeling. Studies by br uer & mbua, rightmire = no systematic differences. Ergasters are early h. erectus from africa & dmanisi. Wolpoff = er 2598 occipital bone w\ erectine features (nuchal torus, nuchal plane > occipital plane, very thick bone. Also er 3228 os coxa like other erectines (lateral facing lateral iliac blade). Dmanisi (georgia) 5 crania, 3 mandibles & postcrania 1. 7-1. 8 mya. Date: matrix adhering to fossils may be redeposited older volcanic tuffs. Tektites (volcanic) date: 1. 1 0. 780 mya. In southeast asia, many islands lie on relatively shallow sunda shelf.
