Genus: Trigonocassis Hincks, 1950
Trigonaspis Spaeth, 1924: 311 (type species: Cassida conducta Boheman, 1862, by monotypy), nec Trigonaspis Hartig, 1840.
Trigonocassis Hincks, 1950: 512 (new name for Trigonaspis Spaeth, 1924 nec Hartig, 1840); Hincks, 1952: 339 (as subgen. of Cassida); Seeno and Wilcox, 1982: 177 (as subgenus of Cassida); Borowiec, 1994 a: 15 (as genus), 1999 d: 321, 2002 e: 280).
Species (1, species with colour photos marked with an asterisk):