Peltocephalus dumerilianus Schweigger 1812:300 Holotype: Formerly in the MNHN, but apparently now lost; no paratypes designated. Fretey (1977:111) believed that the holotype of Emys dumeriliana was MNHN 7893, which he and Williams (1954) identified as Podocnemis unifilis, supposedly making Emys tracaxa Spix (1824:6) the next available name (e.g., Hoogmoed & Gruber, 1983:345). However, Pritchard & Trebbau (1984:89) showed that MNHN 7893 was a Podocnemis expansa, and not the holotype of dumerilianus, and Hoogmoed & Gruber (1983:345) further clarified the synonymy of tracaxa and macrocephala. Finally, MNHN 8634 designated neotype by Bour (2006a:29, and photographed therein). Emys macrocephala Spix 1824:5 Syntypes (3): RMNH 6164 (illustrated in the original description, Pl. IV; Hoogmoed & Gruber 1983:347) and ZSM 15/0 and 17/0 (Franzen & Glaw 2007:207). RMNH 6164 designated lectotype by Hoogmoed and Gruber (1983:347); discussed by Pritchard & Trebbau (1984:89) and Hoogmoed et al. (2010:25–26). Emys tracaxa Spix 1824:6 Syntypes (number uncertain, but one illustrated in the original description, Pl. V): only known syntype is ZSM 16/0, which was designated lectotype by Hoogmoed & Gruber (1983:347); see further comments in Pritchard & Trebbau (1984:89) and Franzen & Glaw (2007:207).

Published as part of Iverson, John B., 2022, A review of Chelonian type specimens (order Testudines), pp. 1-85 in Megataxa 7 (1) on page 14, DOI: 10.11646/megataxa.7.1.1, http://zenodo.org/record/5964441