Genus: Tetracassis Spaeth, 1952
Tetracassis Spaeth in Hincks, 1952: 350 (type species: Metriona lyra Spaeth, 1898, by monotypy); Hincks, 1952: 342; Seeno and Wilcox, 1982: 179; Borowiec, 1999 d: 413.
Species (1, species with colour photos marked with an asterisk):
- lyra*