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Doncaster, 1902

Hooks: 5-6; anterior teeth: 7-10; posterior teeth: 12-14.
Maximum adult body length: 18 mm; tail: 25-31 %.
Body firm and muscular; transversal musculature absent; head wide; hooks not serrated. Fin bridge absent. Anterior fins long, fully rayed, rounded; posterior fins of medium length, partially rayed, rounded. Collarette long; gut diverticula present. Small eyes, with T-shaped pigment spot. Seminal vesicles [with] knob and trunk; position of seminal vesicles: touching both posterior fins and tail fin. Ovaries long, reaching to neck region; ova small. Adhesive papillae and adhesive organs absent. Apical glands absent.

Distribution: epipelagic; Indo-Pacific, between 30°N and 30°S.

Remarks: collarette around the head.

Type locality:

Sagitta ferox