Classification of the genus Tetreucystis
G. †Tetreucystis Bockelie 1984
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†Tetreucystis elongata Bockelie 1984
†Tetreucystis kalvoeyensis Bockelie 1984
†Tetreucystis quadrangularis Regnell 1945
†Tetreucystis tetrabrachiolata Bockelie 1984