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Tokioka, 1939

Hooks: 5-7; anterior teeth: 4-5; posterior teeth: 8-14.
Maximum adult body length: 7 mm; tail: 26-30 %.
Body slender; transversal musculature absent; head narrow; hooks not serrated. Fin bridge absent. Anterior fins of medium length, fully rayed, rounded; posterior fins of medium length, fully rayed, angular. Collarette absent; gut diverticula present. Small eyes with round pigment spot. Seminal vesicles with narrow knob and trunk; position of seminal vesicles: touching neither posterior fins nor tail fin. Ovaries of medium length, reaching to ventral ganglion; ova large. Adhesive papillae and adhesive organs absent; apical glands absent; apical glands absent.

Distribution: neritic; Japanese waters.

Remarks: found outside Tanabe Bay.

Type locality: Tanabe Bay, Japan.

Sagitta delicata