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Alvarino, 1967

Description
Hooks: 6-7; anterior teeth: 10-13; posterior teeth: 21-25.
Maximum adult body length: 25 mm; tail: 20-23 %.
Body firm, opaque; transversal musculature absent; head wide; hooks not serrated. Fin bridge absent. Anterior fins long, partially rayed, angular; posterior fins long, partially rayed, angular. Collarette short; gut diverticula absent. 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 of medium length, reaching to region of ventral ganglion; ova small. Adhesive papillae and adhesive organs absent. Apical glands absent.

Distribution: epipelagic; Gulf of Thailand.

Type locality: 15°40'N, 108°43'E.

Sagitta nagae