Pikaia gracilens is an extinct, primitive chordate animal known from the Middle Cambrian Burgess Shale of British Columbia. Described in 1911 by Charles...

Pikaia! (ピカイア!) is a Japanese educational anime series produced by NHK Educational. The first season started airing on April 29, 2015 for 13 episodes before...

between 538 and 485 million years ago. The first Cambrian chordate known is Pikaia gracilens, a lancelet-like animal from the Burgess Shale in British Columbia...

and Myllokunmingia, also from the Chengjiang fauna, are regarded as fish. Pikaia, discovered much earlier (1911) but from the Mid Cambrian Burgess Shale...

gnathostomatans a little more confusing, as it was roughly contemporary with Pikaia. As Pikaia did not have gill bars, unlike Branchiostoma, there are two possible...

from the Chengjiang biota, are the earliest bodyfossils of fish, whereas Pikaia, discovered much earlier but from the Mid Cambrian Burgess Shale, is now...

Evolution of fish Fish Timeline of fish evolution Forerunners Basal member †Pikaia Cephalochordate †Cathaymyrus Lancelet Olfactores †Haikouella Tunicate †Myllokunmingiidae...

stem-chordates, lying outside a clade formed by Yunnanozoon, Cathaymyrus, Pikaia and crown-chordates. From their superficially tadpole-like forms, leaf or...

Although some paleontologists regarded it as an early chordate allied with Pikaia et al., Conway Morris suggested in 1993 that it might be a Cambrian descendant...

be invertebrate forerunners of the true vertebrates — proto-chordates. Pikaia has been heavily promoted as the oldest fossil protochordate." Richard Dawkins...