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avancna — Pikaia gracilens

Published: 2014-07-25 04:12:17 +0000 UTC; Views: 1848; Favourites: 22; Downloads: 0
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Description Comparison of the "ur-fish," the cephalochordate Pikaia gracilens, of the Burgess Shale fauna, with the hemichordate, Oesia disjuncta.
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