Ophryotrocha notoglandulata

Diagnosis. Prostomium with short, ovate antennae, palps absent; two eyes medially connected; parapodia uniramous, lacking dorsal and ventral cirri, with dorsal protrusion; supra-acicular simple chaetae and subacicular finely serrated falcigers; pygidium with two cirri, pygidial median stylus absent in adults; up to 12 dorsal median rosette glands on posterior segments in males, eight in females; anterior edge of mandibles with 22 – 25 teeth, maxillae with falcate P 1 - forceps, bidentate P 2 - forceps, K-forceps right bidentate, left falcate; gonochoristic; chromosomes 2 n = 6; diameter of eggs 120 – 130 µm; released larvae without parapodia, with long pygidial median stylus.

Remarks. Ophryotrocha notoglandulata can be distinguished from all other species of the O. labronica group by its larger maximum size and greater number of rosette glands.

Distribution. Western North Pacific: Sagami Bay, Japan.

Material examined. Live cultures from specimens collected at the Misaki Marine Biological Station, Sagami Bay, Japan, in 1961 by Prof. C. Hauenschild.