Pilidium recurvatum larva of Riserius spp. Specimen II

Nemertea: Anopla: Heteronemertea

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10x Plan Fluor / 20x Plan Apo. DIC. Sampled in Bay of Santander. May, 27th 2017.

The locations of this type of pilidium larva, with morphological variations, have been:
Coast of Rhode Island, USA
Bay of Nha Trang, Vietnam
Gullmarfjord, Sweden
Sea of Japan, Russia
NE Pacific off Washington and Oregon, USA

Fewkes 1883

Fewkes (1883)

References
Fewkes, J.W. (1883). On the developmental stages of certain worm larvae. Bull. Mus. Comp. Zool. 11(9): 167–208. (see Pl. V).
Hiebert, T.C., Dassow, G., Giebelt, L.S. & Maslakova, S. (2013). The peculiar nemertean larva pilidium recurvatum belongs to Riserius sp., a basal heteronemertean that eats Carcinonemertes errans, a hoplonemertean parasite of Dungeness crab. Invertebrate Biology x(x): 1–19.
Norenburg, J.L. (1993). Riserius pugetensis gen. n., sp. n. (Nemertina: Anopla), a new mesopsammic species, and comments on phylogenetics of some anoplan characters. Hydrobiologia 266: 203-205.

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