Classification of Vokes 1956
G. Huxleyia Adams 1860
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Huxleyia concentrica Verco 1907
Huxleyia diabolica Jousseaume 1897
Invalid names: Cyrilla Adams 1860 [synonym], Cyrillista Iredale 1929 [synonym], Diabolica Jousseaume 1897 [synonym]
G. Nucinella Wood 1850
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Subg. Nucinella (Huxleyia) Adams 1860
Nucinella adamsi Dall 1898
Nucinella dalli Hedley 1902
†Nucinella dumasi Cossmann and Peyrot 1914
†Nucinella glabra Ravn 1939
†Nucinella gunteri Mansfield 1932
Nucinella hedleyi Cotton and Godfrey 1938
†Nucinella laevigata Vincent 1899
Nucinella maxima Thiele and Jaeckel 1931
†Nucinella microdus Boettger 1869
Nucinella moarianus Hedley 1904
†Nucinella oregona Vokes 1956
†Nucinella seguenzai Dall 1898
Nucinella subdolus Strong and Hertlein 1937
†Nucinella zinndorfi Zilch 1937
Invalid names: Cyrillona Iredale 1929 [synonym], Neopleurodon Hertlein and Strong 1940 [synonym], Nuculina d'Orbigny 1844 [replaced], Pleurodon Wood 1840 [replaced]