Larva of Protodrilus.

Protodrilus Hatschek, 1881

Annelida: Polychaeta: Protodrilidae

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The images were taken on two levels of focus.
20x Plan Apo. DIC. Sampled in Bay of Santander. May, 21st 2017.

Reference
Plate, S. & Husemann, E. (1994). Identification guide to the planktonic polychaete larvae around the island of Helgoland (German Bight). Helgoländer Meeresunters, 48, 1-58. (see Fig. 2).
Larink, O. & Westheide, W. (2011). Coastal plankton. Verlag Dr.Friedrich Pfeil. München. (see Plate 43).

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