Classification of the genus Opalia

G. Opalia Adams and Adams 1853
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Subg. †Opalia (Contemniscala) de Boury 1909
Subg. †Opalia (Crassiscala) de Boury 1887
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Crassiscala subterranea Wrigley 1940
Subg. Opalia (Dentiscala) de Boury 1886
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Dentiscala funiculata Carpenter 1857
Invalid names: Opalia crenatoides insculpta Carpenter 1863 [synonym]
Subg. †Opalia (Granuliscala) de Boury 1909
Subg. Opalia (Nodiscala) De Boury 1890
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Invalid names: Funiscala de Boury 1891 [synonym]
Subg. Opalia (Opalia) Adams and Adams 1858
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Subg. †Opalia (Rugatiscala) de Boury 1913
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Opalia (Rugatiscala) williamsoni Anderson and Martin 1914
Opalia atra Squires and Saul 2003
Opalia borealis Gould 1852
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Invalid names: Opalia chacei Strong 1937 [synonym], Scala wroblewskyi Mörch 1876 [synonym], Scalaria (Psychrosoma) gouldii Tapparone-Canefri 1876 [synonym]
Opalia cavea Squires and Saul 2003
Opalia crenatoides Carpenter 1864
Opalia insculpta Carpenter 1866
Opalia varicostata Stearns 1875
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Invalid names: Opalia anomala Stearns 1875 [synonym]
Scala (Opalia) prunicola Martin 1904