Some proetids (Class Trilobita) from the lower to middle Devonian of southern Morocco

Two genera of proetids (Order Proetida, Class Trilobita) are be discussed in this thesis---Timsaloproetus new genus and Gerastos. The species described here and assigned to these two genera are from the Lower to Middle Devonian of southern Morocco. Two new species are proposed for Timsaloproetus: T. dibbanus and T. elguerrouji. Along with the systematics, a cladistic analysis was undertaken of the Gerastos species found in the northern flank of the Tindouf Basin, the Ma'der Basin, and at one locality of the Tafilalt Basin. Eleven new species/subspecies of Gerastos are proposed (from oldest to youngest): G. tuberculatus marocensis, G. aintawilus, G. lisanrasus, G. ainrasifus, G. discombobulates, G. cuiveri malisus, G. taqus, G. malisjildus, G. raribus, G. emmetus and G. izius.