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Casanova, 1994

Hooks: 9; anterior teeth: 8-9; posterior teeth: 13-14.
Maximum adult body length: 6 mm; tail: 40 %.
Body firm and muscular, opaque; transversal musculature on trunk and tail; head wide; hooks not serrated. Fin bridge absent; one pair of medium length lateral fins both on trunk and tail; lateral fins partially rayed, very few rays, rounded. Collarette absent; gut diverticula absent; eyes absent. Seminal vesicles conical; position of seminal vesicles: touching both posterior fins and tail fin. Ovaries unknown; ova unknown. Adhesive papillae and adhesive organs absent. Vestibular organs oval, thin and smooth, no papillae; apical gland cell complex present; neck canals absent.

Distribution: bathypelagic.

Remarks: one specimen from about 3600 m in the Eastern North Atlantic.

Type locality: 32°54.4'N, 11°38.5'W.

Heterokrohnia angeli