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Alvarino, 1961

Description
Hooks: 5-7; anterior teeth: 5-8; posterior teeth: 8-16.
Maximum adult body length: 19 mm; tail: 22-29 %.
Body firm, opaque; transversal musculature absent; head of medium width. Hooks serrated in juveniles and adults. Fin bridge absent. Anterior fins of medium length, fully rayed, rounded; posterior fins of medium length, fully rayed, angular. Collarette absent or short; gut diverticula absent. Small eyes with T-shaped pigment spot. Seminal vesicles with knob and trunk; position of seminal vesicles: touching tail fin, close to or touching posterior fins. Ovaries of medium length, to region of ventral ganglion; ova large. Adhesive papillae and adhesive organs absent.

Distribution: epipelagic, distant neritic; Eastern Pacific.

Remarks: Seminal vesicle has a knob with one appendage.

Type locality: 30°06'N, 118°25.5'W.

Sagitta bierii