(Spix in Spix & Wagner, 1827)
Original Description: Anodon trigonus Spix, 1827. in Spix, J.B. and J.A. Wagner. 1827. Testacea fluviatilia quae in itinere per Brasiliam collegit. Leipzig pp. 1-36.
Type Locality: Rio Negro, Brazil.
Holotype: Location unknown.
Synonymy:
- Glabaris trigonus (Spix, 1827)
- Simpson 1900:928.
Anodontites (Anodontites) trigonus trigonus(Spix, 1827)
- Haas 1931:90; 1969:560.
Specimens Examined: INHS 14808 (33). Caño Masparito, 1 km NW Libertad, Barinas, Venezuela. 14 January 1993. K.S. Cummings & C.A. Mayer. INHS 14907 (6). Caño Hondo, Agua Negra, Barinas, Venezuela. 14 January 1993. K.S. Cummings & C.A. Mayer. INHS 14889 (9). Rio Camoruco, between Estero & Campo Alegre, about 10 km NW Libertad, Cojedes, Venezuela. 9 January 1993. K.S. Cummings & C.A. Mayer. INHS 14869 (6). Caño el Sardinero, 14 km SE Guanare, Portuguesa, Venezuela. 1 January 1993. K.S. Cummings & C.A. Mayer. INHS 14951 (7). Caño El Sardinero, 14 km SE Guanare, Portuguesa, Venezuela. 2 January 1994. K.S. Cummings & C.A. Mayer. INHS 14960 (3). Caño Cumarepo, ca. 4 km N Guanarito on rd. from Guanare to Guanarito, Portuguesa, Venezuela. 3 January 1994. K.S. Cummings. INHS 14929 (1). Caño Igues, La Capilla, Portuguesa, Venezuela. 3 January 1994. K.S. Cummings & G.B. Mottesi. INHS 14901 (1). Caño Maraca, on rd. from Guanare to Guanarito at 60 km marker, Portuguesa, Venezuela. 17 January 1993. L.M. Page. INHS 14938 (1). Caño Maraca, on rd. from Guanare to Guanarito at 60 km marker, Portuguesa, Venezuela. 30 December 1993. K.S. Cummings & C.A. Mayer. INHS 15940 (1). Caño Igues, Puerto Papelon, Portuguesa, Venezuela. 17 December 1992. D. Rodriguez & P. Pacheco.