Pikaia (1 janv. 513000000 av. J.-C. – 1 janv. 505000000 av. J.-C.)
Description:
Pikaia gracilens is an extinct, primitive chordate marine animal known from the Middle Cambrian Burgess Shale of British Columbia. Described in 1911 by Charles Doolittle Walcott as an annelid, and in 1979 by Harry B. Whittington and Simon Conway Morris as a chordate, it became "the most famous early chordate fossil", or "famously known as the earliest described Cambrian chordate". It is estimated to have lived during the latter period of the Cambrian explosion. Since its initial discovery, more than a hundred specimens have been recovered.Ajouté au bande de temps:
Date:
1 janv. 513000000 av. J.-C.
1 janv. 505000000 av. J.-C.
~ 5883516 years