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(Casanova, 1993)

Description
Hooks: 8-9; anterior teeth: 9-11; posterior teeth: 10-11.
Maximum adult body length: 8 mm; tail: 48-49 %.
Body slender transparent; 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 fully rayed, rounded. Collarette absent or very thin; gut diverticula absent; eyes absent. Seminal vesicles conical; position of seminal vesicles: touching both posterior fins and tail fin . Ovaries short; ova fairly large. Adhesive papillae and adhesive organs absent. Vestibular organs small, with one row of tiny papillae; apical gland cell complex absent; neck canals absent.

Distribution: benthopelagic at about 700m.

Remarks: 6 specimens from about 700 m, with a very typical gland, described as a new genus by Casanova in the Eastern North Atlantic.

Type locality: 44°35.74'N, 2°13.26W.

Heterokrohnia sorbei