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Fowler, 1905

Hooks: 5-7; anterior teeth: 4-10; posterior teeth: 6-18.
Maximum adult body length: 14 mm; tail: 25-31 %.
Body slender; transversal musculature absent; head of medium width; hooks not serrated. Fin bridge absent. Anterior fins of medium length, partially rayed, rounded; posterior fins of medium length, partially rayed, rounded. Collarette absent; gut diverticula present. Large eyes with T-shaped pigment spot. Seminal vesicles with narrow knob and trunk; position of seminal vesicles: touching neither posterior fins nor tail fin. Ovaries short, reaching to anterior end of posterior fins; ova large. Adhesive papillae and adhesive organs absent. Apical glands absent.

Distribution: deep-mesopelagic; circumglobal, between 40°N and 40°S.

Remarks: sperm receptacula in anterior end of ovaries.

Type locality: Bay of Biscay.

Sagitta decipiens