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Pikaia gracilens

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description Pikaia gracilens Overview

Pikaia gracilens is an extinct, small-bodied chordate known from Middle Cambrian fossils in the Burgess Shale of British Columbia, Canada. Specimens preserve a slender body with repeated, chevron-shaped muscle blocks and a longitudinal supporting structure interpreted as a notochord. Pikaia is important to studies of early chordate evolution because it displays anatomical features associated with the lineage that includes vertebrates, while remaining outside the vertebrate group itself.

help Pikaia gracilens FAQ

Why is Pikaia important in the history of vertebrates?

Pikaia preserves chordate-like features, including repeated muscle blocks and a longitudinal supporting structure interpreted as a notochord. It is not necessarily a direct human ancestor, but it helps document the early history of the broader chordate lineage.

Was Pikaia a fish?

Pikaia was a small marine chordate, not a true fish with jaws, vertebrae, or paired fins. Its slender body and segmented muscles nevertheless give it a superficially fish-like appearance.

Where was Pikaia gracilens discovered?

Its fossils come from the Burgess Shale in British Columbia, Canada. These Middle Cambrian deposits preserve soft-bodied organisms that would rarely fossilize under ordinary conditions.

How did Pikaia move and feed?

Its repeated muscle blocks probably allowed it to swim by flexing its body from side to side. Its precise diet remains uncertain, but anatomical interpretations commonly place the mouth near the front underside of the body.

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