Classification of the genus Carydium
G. †Carydium Beushausen 1895
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†Carydium bellastriatum Conrad 1841
†Carydium boliviensis Swartz 1925
†Carydium clarkei Bailey 1986
†Carydium globularis Hall 1885
†Carydium insularis Walcott 1884
†Carydium manitobensis Whiteaves 1892
†Carydium sociale Beushausen 1895
†Carydium varicosum Hall and Whitfield 1869