Key to known species of Oribatodes (adult)

1. Interlamellar seta very long, extending beyond tip of lamella; anterior margin of notogaster almost straight; body length: 850............................. O. crenulatus Csiszár, 1962 (see also Walter et al. 2013). Distribution: Southeast Europe.

- Interlamellar seta not extending beyond tip of lamella; anterior margin of notogaster distinctly convex medially.......... 2

2. Interlamellar seta very short (not longer than diameter of bothridium); foveolae of notogaster specifically deformed; body length: 888................................................. O. grandis (Sitnikova, 1979) . Distribution: Ecuador.

- Interlamellar seta distinctly longer than diameter of bothridium; foveolae of notogaster rounded, oval or polygonal (not deformed).......................................................................................... 3

3. Notogastral setae la, lm, lp, h 2, h 3 robust, heavily barbed...................................................... 4

- Notogastral setae la, lm, lp, h 2, h 3 setiform, not heavily barbed................................................. 5

4. Interlamellar area with foveolae; body length: 530–600.................................................................. O. mirabiloides (Jacot, 1938) (see also Baker & Wharton 1952; Walter et al. 2013). Distribution: Eastern U.S.A.

- Interlamellar area with ridges; body length: 557–635............................................ O. decoui (Vasiliu & Călugăr, 1977) (see also Balogh & Mahunka 1979 —as for Cepheus (Cubacepheus) lobatus). Distribution: Eastern U.S.A.

5. Foveolae of notogaster sparsely located, not forming foveolate-reticulate ornamentation; body length: 725........................................................................ O. areolatus (Sitnikova, 1979) . Distribution: Ecuador.

- Foveolae of notogaster closely located, forming foveolate-reticulate ornamentation................................ 6

6. Interlamellar seta long, longer than distance between insertions of in–in, robust; rostrum narrowly triangular; body length: 500– 750..... O. mirabilis Banks, 1895 (see also Berlese 1910; Banks 1915; Walter et al. 2013). Distribution: Northern Nearctic.

- Interlamellar seta medium-sized, almost twice shorter than distance between insertions of in–in, setiform; rostrum rounded; body length: 630–690............................ O. reticulatus (Sitnikova, 1979) . Distribution: Northern Neotropics.