costulata, Unio (Monocondylea), J. Moricand, 1858: 453, pl. 15 fig. 1.

Type locality: Brésil. Syntypes: MHNG-INVE-91234 (1) ( Unionidae) [Figs 50-53].

– Remarks. Moricand junior wrote “j’en ai reçu seulement deux individus”, which is interpreted as two doublets. Only one specimen (doublet), however, could be found in the collection. The specimen was labelled as having been revised by Haas in 1930.