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Casanova, 1991

Hooks: 9-11; anterior teeth: 1-2; posterior teeth: 1.
Maximum adult body length: 6 mm; tail: 49 %.
Body slender and transparent; transversal musculature on trunk; head wide; hooks not serrated. Fin bridge absent; one pair of short lateral fins both on trunk and tail; lateral fins fully rayed, rounded. Collarette long; gut diverticula absent; no eyes. Seminal vesicles conical; position of seminal vesicles: touching both posterior fins and tail fin. Ovaries short. Ovaries immature, small ova. Adhesive papillae present; adhesive organs with adhesive appendages absent; apical glands absent.

Distribution: benthic neritic.

Remarks: found at 211 m in the Weddell Sea, Antarctic waters.

Type locality: 71°37.1'S, 12°10.9'W.

Spadella antarctica