Trochophore larva (L3 stage) of Chaetopteridae

Polychaeta: Chaetopteridae

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Specimen in phases of contraction.
20x Plan Apo. DIC / Phase Contrast. Sampled in Bay of Santander. March, 18th 2017.

Reference
Irvine, S.T. Chaga, O. & Martindale, M.Q. (1999). Larval Ontogenetic Stages of Chaetopterus: Developmental Heterochrony in the Evolution of Chaetopterid Polychaetes. Biological Bulletin 197: 319-331.

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