1) Transitional fossil
Found on
https://www.crosswordclues.com/clue/pikaia
Pikaia gracilens is an extinct animal known from the Middle Cambrian Burgess Shale of British Columbia. Sixteen specimens of Pikaia are known from the Greater Phyllopod bed, where they comprised 0.03% of the community. It resembles a living chordate commonly known as the lancelet and perhaps swam much like an eel. ==Discovery== P. gracilens was di...
Found on
http://en.wikipedia.org/wiki/Pikaia
(from the article `cephalochordate`) ...animals such as lancelets rarely have a good fossil record. A few fossils have been interpreted as cephalochordates, but few of these ...
Found on
http://www.britannica.com/eb/a-z/p/67
No exact match found.
