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Tokioka, 1938

Hooks: 7-9; anterior teeth: 6-8; posterior teeth: 14-20.
Maximum adult body length: 10 mm; tail: 28-33 %.
Body flaccid, transparent, weak musculature; 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 long; gut diverticula present. Small eyes with round pigment spot. Seminal vesicles with knob and trunk; position of seminal vesicles: touching both tail fin and posterior fins. Ovaries short to posterior end of anterior fins; ova large. Adhesive papillae and adhesive organs absent. Apical glands absent.

Distribution: neritic; West Pacific.


Type locality: Japanese waters.

Sagitta crassa