Classification of the family Orthothecidae

Fm. †Orthothecidae Syssoiev 1957
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G. †Bactrotheca Novak 1891
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Bactrotheca emmonsi Ford 1873
Bactrotheca teres Barrande 1867
G. †Lenatheca Rozanov et al. 1969
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Lenatheca groenlandica Poulsen 1932
G. †Lentitheca Sysoyev 1958
G. †Orthotheca Novak 1886
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Orthotheca buelna Lochman 1952
Orthotheca corrugata Matthew 1899
Orthotheca daulis Walcott 1905
Orthotheca doris Walcott 1905
Orthotheca shriveri Malinky 2009
Orthotheca suavis Barrande 1872
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Invalid names: Orthotheca intermedia Novak 1886 [objective synonym]
Orthotheca subornatus Reed 1909
Orthotheca teretiuscula Linnarsson 1877
G. †Quadrotheca Sysoyev 1958
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Quadrotheca shipaiensis Qian et al. 1979
G. †Semielliptotheca Syssoiev 1958
G. †Trapezotheca Syssoiev 1958
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Trapezotheca aemulus Holm 1893
Trapezotheca bicostata Rozanov et al. 1969