? Halecium lamourouxianum (d’Orbigny, 1846)

Synonyms in the area: Thoa lamourouxiana d’Orbigny, 1846 [polyp]. Remarks: this is the unique record of this doubtful, even unrecognizable, species. Distribution in South America: polyp—Atlantic Ocean, Argentina, at Río Negro (d’Orbigny 1846; Blanco 1994a).