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Omul preistoric
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Omul preistoric
de Crazyangel



In urma cu aproximativ 220 de mililoane de ani, pe pamant au aparut primele mamifere. Acestea au evoluat din reptile si erau extrem de mici hranindu-se cu insecte.

In urma cu aproximativ 35 milioane de ani, antropoidele eu evoluat in doua grupe distinctive. Platyrrhienii au devenit maimutele din lumea noua, cu 36 de dinti si o coada lunga cu care se puteau agata de crengile arborilor. Acestea au devenit maimutele, omul preistoric si mai apoi omul din Lumea Veche.

Dupa o lunga perioada obscura dam abia de urma omului, sub forma unor urme de pasii cu o vechime de 3,6 milioane de ani.

Acestea au fost descoperite in 1976, la Laetoli, in Tanzania, de Mary Leakey. Urmele de pasii s-au pastrat in cenusa vulcanica si provin de la trei indivizi diferiti: doi adulti si un copil.

Dintr-o perioada putin mai tarzie, cu 3.6- 3 milioane de ani in urma, provine cea mai buna dovada fosila preistorica a liniei care avea sa evolueze in om. Acesta este Lucy scheletul unei femei tinere, descoperitin 1974, in Etiopia. Lucy era destul de scunda, avand o inaltime putin peste unmetru iar craniu si dintii asemanatorii cu cei ai maimutelor. Forma articulatiilor si a legaturilor sale musculoase sunt adaptate la fel de mult pentru viata arboricole cat si pentru cea terestra. Ea se deplaseaza in pozitie verticala.Aceasta specie este numita astazi Australopitbecus afarensis-Austalopitbecus.
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