Classification of the genus Williamsonia
G. †Williamsonia Carruthers 1870
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†Williamsonia amarjolense Sharma 1968
†Williamsonia blanfordii Feistmantel 1876
†Williamsonia campanulatiformis Sharma 1969
†Williamsonia delawarensis Berry 1907
†Williamsonia elocata Lesquereux 1891
†Williamsonia gallinacea Ward 1905
†Williamsonia gigas Lindley and Hutton 1831
†Williamsonia guptae Sharma 1968
†Williamsonia harrisiana Bose 1968
†Williamsonia indica Seward 1917
†Williamsonia kakadbhitensis Bose and Banerji 1984
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Invalid names: Carnoconites laxum Srivastava 1946 [replaced], Strobilites pascoei Sahni 1928 [replaced]
†Williamsonia marylandica Berry 1914
†Williamsonia microps Feistmantel 1877
†Williamsonia oregonensis Fontaine 1905
†Williamsonia phoenicopsoides Ward 1899
†Williamsonia recentior Dawson 1885
†Williamsonia riesii Hollick 1892
†Williamsonia sahnii Gupta 1943
†Williamsonia santalensis Sitholey and Bose 1953
†Williamsonia seniana Bose and Kasat 1969
†Williamsonia sewardiana Sahni 1932
†Williamsonia smockii Newberry 1895
†Williamsonia sukhpurensis Bose and Banerji 1984
†Williamsonia texana Fontaine 1893
†Williamsonia trambauensis Bose and Banerji 1984
†Williamsonia virginiensis Fontaine 1889