Classification of Middlemiss 1959
G. †Cyrtothyris Middlemiss 1959
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†Cyrtothyris cantabridgiensis Walker 1870
†Cyrtothyris dallasi Walker 1867
†Cyrtothyris seeleyi Walker 1870
†Cyrtothyris uniplicata Walker 1870
G. †Praelongithyris Middlemiss 1959
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†Praelongithyris lankesteri Walker 1868
†Praelongithyris praelongiforma Middlemiss 1959
G. †Rhombothyris Middlemiss 1959
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†Rhombothyris conica Middlemiss 1959
†Rhombothyris extensa Meyer 1864
†Rhombothyris meyeri Walker 1868
†Rhombothyris microtrema Walker 1868
G. †Sellithyris Middlemiss 1959
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†Sellithyris coxwellensis Middlemiss 1959
†Sellithyris upwarensis Walker 1870
†Sellithyris sella Sowerby 1823
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†Sellithyris sella shanklinensis Middlemiss 1959