Key to the known Mesozoic species of Ochodaeidae

1. Body small (about 6 mm) ............................................................................................................................................ 2

- Body large (10–12 mm) ................................................................................................................................................ 3

2. Elytron with striae well defined (Fig. 4) ................................................................... Cretochodaeus striatus Nikolajev

- Elytron without obvious striae (Fig. 5) ................................................................... Lithochodaeus cretaceus Nikolajev

3. Mesotibiae without transverse carinae along outer edge (Fig. 3) ....................... Cretochodaeus mongolicus Nikolajev

- Mesotibiae with transverse carinae along outer edge (Fig. 1–2) ..................... Mesochodaeus daohugouensis sp. nov.