Sayimys, WOOD, 1937

Hartman, Julian, Van De Weerd, Andrew A., Bruijn, Hans De & Wessels, Wilma, 2019, An Exceptional Large Sample Of The Early Miocene Ctenodactyline Rodent Sayimys Giganteus, Specific Variation And Taxonomic Implications, Fossil Imprint 75 (3 - 4), pp. 359-382 : 373

Sayimys assarrarensis LÓPEZ- ANTOÑANZAS et SEN, 2004

H o l o t y p e. A fragmentary left maxilla with P4–M2.

P a r a t y p e s. Some 18 isolated cheek teeth.

Ty p e l o c a l i t y. As-Sarrar, Dam Formation, Saudi Arabia; assigned age of the site: later part of the early Miocene, 15–17 Ma.

D i s c u s s i o n. This small species is similar in size to Sayimys intermedius . The As Sarrar locality is slightly older than the type locality of S. intermedius . The single reasonably preserved dp4 of S. assarrarensis shows a welldeveloped mesolophid and a slightly elongated anteroconid. Considering the large variation in dental morphology and size of large Sayimys assemblages, we consider S. assarrarensis a junior synonym of S. intermedius . More material is needed from the type localities to ascertain specific differences, if any.