Genus: Microderson SIGOGNEAU-RUSSELL, 1991
Etymology: Greek, mikros, “small” and Arabic, derson, “cheek tooth”: Small cheek tooth.

Species: laaroussii SIGOGNEAU-RUSSELL, 1991

Holotype: MNHN SA 40

Locality: Anoual microvertebrate locality, about 100 km east of the city of Anoual an dnear a fort called Ksar Met Lili, Talsinnt Province, eastern High Atlas Mountains, Morocco.

Horizon: Morocco B sequence of the ‘couches rouges’.

Biostratigraphy: Unnamed non-marine limestone lens.

Age: Probably Berriasian Stage, Lower Neocomian Subepoch, Lowermost Early Cretaceous Epoch, Early Cretaceous.

Material: Right upper molar.