Hooks: 6-9; anterior teeth: 8-12; posterior teeth: 9-14.
Maximum adult body length: 8 mm; tail: 27-29 %.
Body slender; transversal musculature absent; head medium width; hooks not serrated. Fin bridge absent. Anterior fins of medium length, fully rayed, rounded; posterior fins of medium length, partially rayed, rounded. Collarette present, conspicuous; gut diverticula present. Eyes with crescent shaped pigment spot. Seminal vesicles voluminous with knob and trunk; position of seminal vesicles: touching both posterior fins and tail fin. Ovaries long reaching neck region; ova fairly large. Adhesive papillae and adhesive organs absent; apical glands absent.
Distribution: epipelagic; north-east Pacific.
Type locality: Eastern North Pacific.