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Genus: Asijatheca Missarzhevsky & Mambetov, 1981 † (DB: 1 SP)
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Asijatheca probata
Missarzhevsky & Mambetov, 1981 † (FOSSIL)
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Genus: Costatheca Rozanov & al., 1969 † (DB: 1 SP)
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Costatheca clinisepta
(A.V. Sysoev, 1960 †) (FOSSIL)
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Tetratheca clinisepta A.V. Sysoev, 1960 † =» Costatheca clinisepta
(A.V. Sysoev, 1960 †)
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Genus: Holmitheca Sysoev, 1968 † (DB: 3 SP)
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Holmitheca obvia
A.V. Sysoev, 1968 † (FOSSIL)
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Holmitheca ulterior
A.V. Sysoev, 1968 † (FOSSIL)
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Holmitheca zhuravlevae
A.V. Sysoev, 1968 † (FOSSIL)
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Genus: Tetratheca Sysoev, 1968 † (DB: 2 SP)
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Tetratheca composita
Meshkova, 1974 † (FOSSIL)
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Tetratheca pentagona
A.V. Sysoev, 1968 † (FOSSIL)
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