Classification of the genus Pyrgocystis
G. †Pyrgocystis Bather 1915
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†Pyrgocystis cylindrica Aurivillius 1892
†Pyrgocystis procera Aurivillius 1892
†Pyrgocystis sardesoni Bather 1915
†Pyrgocystis sulcata Aurivillius 1892
†Pyrgocystis varia Aurivillius 1892