Subgenus (Ixartia) J. E. Gray, 1852

(3-2-4-0-4-3-0-38-2-0-0-0-0)
Ref. Bernard, 1983 p 64

curta T. A. Conrad, 1837
(3-2-4-0-4-3-0-38-2-1-0-0-0)
Short Thracia, Short Western Thracia
Size 1'-1.5" long
Ref. Abbott, 1974 p 559 bw
Amer. Fish. Soc., 1988 p 48
Bernard, 1983 p 64

devexa G. O. Sars, 1878
(3-2-4-0-4-3-0-38-2-2-0-0-0)
Sloping Thracia
Ref. Amer. Fish. Soc., 1988 p 48
Syn. Thracia (Thracia) truncata devexa G. O. Sars, 1878
Ref. Bernard, 1979 p 61
Bernard, 1983 p 64
Wagner, 1984 p 74 bw

myopsis ex H. Beck, ms, H. P. C. Moller, 1842
(3-2-4-0-4-3-0-38-2-3-0-0-0)
Arctic Thracia
Ref. Abbott, 1974 p 559
Amer. Fish. Soc., 1988 p 48
Syn. Thracia (Thracia) truncata typica G. O. Sars, 1878
Ref. Bernard, 1979 p 61
Syn. Thracia (Thracia) couthouyi W. Stimpson, 1851;
Thracia (Thracia) truncata G. O. Sars, 1878 [not J. W. Mighels & Adams, 1842 nor T. Brown, 1844]
Ref. Bernard, 1983 p 64