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Marumo & Kitou, 1966

Hooks: 10-12; anterior teeth: 1-7; posterior teeth: 2-7.
Maximum adult body length: 15 mm; tail: 34-39 %.
Body large and firm, opaque; transversal musculature on trunk and tail; head very large; hooks not serrated. Fin bridge absent; one pair of medium-length lateral fins both on trunk and tail; lateral fins fully rayed, rounded. Collarette short; gut diverticula absent; eyes absent. Seminal vesicles conical; position of seminal vesicles: touching both posterior fins and tail fin. Ovaries short; ova fairly small. Adhesive papillae and adhesive organs absent. Vestibular organs large with large processes; apical gland cell complex present; neck canals present.

Distribution: bathypelagic.

Remarks: 3 specimens found between 1000 and 4000 m in the Western North Pacific.

Type locality: 34°29.3'N, 138°35.5'E.

Heterokrohnia bathybia