An extinct animal that lived in the Cambrian era, whose fossils were found in the Burgess Shale. Its fame stems from the fact that it was classified as a chordate, and is the earliest fossil to have been placed in this group.

This tag is for the animal, not for the "children's anime series of that name":https://en.wikipedia.org/wiki/Pikaia!, and not for the character from the series either.

h4. External links

* "Wikipedia: Pikaia":https://en.wikipedia.org/wiki/Pikaia
pikaia