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Casanova, 1986

Hooks: 8-11; anterior teeth: none; posterior teeth: 5-11.
Maximum adult body length: 14 mm; tail: 28-34 %.
Body flaccid, tranparent, broadest at region of tail septum; transversal musculature on trunk; head narrow; hooks serrated in juveniles; one pair of very long lateral fins both on trunk and tail; lateral fins partially rayed, rounded. Collarette absent; gut diverticula absent; eyes absent. Seminal vesicles conical; position of seminal vesicles: touching posterior fins, separated from tail fin. Ovaries short, curved in juveniles; ova large. Adhesive papillae and adhesive organs absent; apical glands present.

Distribution: mesopelagic; Tropical Eastern Atlantic.

Remarks: 21 specimens found South tropical Atlantic.

Type locality: 5°26'S, 1°30'E.

Eukrohnia flaccicoeca