Costatheca clinisepta (FOSSIL) (A.V. Sysoev, 1960 †) Russia, Sakha, Bulunskiy rayon
Tetratheca composita (FOSSIL) Meshkova, 1974 † Russia, Yakutia
Holmitheca obvia (FOSSIL) A.V. Sysoev, 1968 † Russia, Yakutia
Tetratheca pentagona (FOSSIL) A.V. Sysoev, 1968 † Russia, Yakutia
Asijatheca probata (FOSSIL) Missarzhevsky& Mambetov, 1981 † Kazakhstan
Holmitheca ulterior (FOSSIL) A.V. Sysoev, 1968 † Russia, Yakutia
Holmitheca zhuravlevae (FOSSIL) A.V. Sysoev, 1968 † Russia, Yakutia