Acanthochelys macrocephala (Rhodin, Mittermeier & McMorris, 1984:38)

Holotype: NMW 1293 (Tiedemann et al. 1994:12); photographed in the original description (p. 39, Fig. 2; p. 41, Fig. 3) and Fritz & Pauler 1999:54); paratype (1), MHNRJ 1065 (skull illustrated in original description, p. 42–43, Figs. 5–6).

Phrynops chacoensis Fritz & Pauler 1992:299

Holotype: SMNS 3984 /85 (skull and soft parts of one specimen; Schlüter & Hallermann 1997:9); paratype (1), NMBA 171.