Gieysztoria falx Brusa, Damborenea & Noreña, 2003 .

Type locality. Argentina, Buenos Aires Province, Berisso, Canteras Los Talas (34º53ʹS, 57º50ʹW). Syntypes: MLP 4928 (7 specimens: 3 sagitally sectioned specimens, 4 whole mounted). Reference. Brusa et al. (2003).