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McLelland, 1989

Hooks: 7-9; anterior teeth: none; posterior teeth: 2-26.
Maximum adult body length: 43 mm; tail: 19-25 %.
Body firm, broadest at region of tail septum; transversal musculature on trunk; head medium width; 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. Small eyes without pigment. Seminal vesicles conical; position of seminal vesicles: touching or close to posterior fins well separated from tail fin. Ovaries of medium length, reaching to region of ventral ganglion; ova small. Adhesive papillae and adhesive organs absent; apical glands present.

Distribution: mesopelagic.

Type locality: Caribbean.

Eukrohnia calliops