Trochophore larva of spionid worm. Specimen I

Spionidae Grube, 1850

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The images were taken on two levels of focus.
20x Plan Apo. DIC. Sampled in Bay of Santander. April, 20th 2017.

References
Claparède, E. & Mecznikonw, E. (1869). Beiträge zur Kenntnis der Entwicklungsgeschichte der Chaetopoden. Zeitschrift für Wissenschaftliche Zoologie. Verlag von Wilhelm Engelmann. Leipzig. (see Taf. XII).
Blake, J.A. & Arnofsky, P.L. (1999). Reproduction and larval development of the spioniform Polychaeta with application to systematics and phylogeny. Hydrobiologia 402: 57-106.
Plate, S. & Husemann, E. (1994). Identification guide to the planktonic polychaete larvae around the island of Helgoland (German Bight). Helgoländer Meeresunters, 48, 1-58.

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