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Alvarino, 1961

Hooks: 7-9; anterior teeth: 3-7; posterior teeth: 6-16.
Maximum adult body length: 16 mm; tail: 19-22 %.
Body slender; transversal musculature absent; head narrow; hooks not serrated. Fin bridge absent.Anterior fins short, fully rayed, rounded; posterior fins of medium length, fully rayed, rounded. Collarette short; gut diverticula present. Large eyes, with star-shaped pigment spot. Seminal vesicles narrow with head and trunk; position of seminal vesicles: touching neither posterior fins nor tail fin. Ovaries short, reaching to anterior end of posterior fins; ova small. Adhesive papillae and adhesive organs absent. Apical glands absent.

Distribution: neritic; Gulf of California.

Remarks: collarette around the head.

Type locality: Gulf of California, Eastern Pacific.

Sagitta euneritica