Classification of Reed 1909
G. †Hyolithes d'Eichwald 1840
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Subg. †Hyolithes (Orthotheca) Novak 1886
†Hyolithes asteroideus Reed 1909
†Hyolithes columbanus Reed 1909
†Hyolithes girvanensis Reed 1909
†Hyolithes immemor Reed 1909
†Hyolithes multipunctatus Reed 1909
†Hyolithes penkillensis Reed 1909
†Hyolithes subcrispatus Reed 1909
†Hyolithes sylvestris Reed 1909
G. †Pterotheca Salter 1853
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†Pterotheca drummuckensis Reed 1909
†Pterotheca girvanensis Reed 1909
†Pterotheca mullochensis Reed 1909
†Pterotheca multidecorata Reed 1909
†Pterotheca simplex Reed 1909
Subg. †Hyolithus (Orthotheca) Novak 1886
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†Hyolithus (Orthotheca) subexcavatus Reed 1909
†Hyolithus (Orthotheca) subornatus Reed 1909
†Hyolithus (Orthotheca) thraivensis Reed 1909
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