Pikaia (jan 1, 513000000 BC – jan 1, 505000000 BC)
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.Added to timeline:
Date:
jan 1, 513000000 BC
jan 1, 505000000 BC
~ 5883516 years