While the late Eocene/Oligocene elasmobranches have been largely reported around the eastern Tethysian straitbefore its final closure (eg, Egypt, Oman, and Pakistan), few reports were made near its western counterpart, connected with the Atlantic realm. Here we report a series of exceptional fossil localities that fill this gap withprevious (Adnet et al., 2010) and new (this work) materialsrecoveredalong the continental cliffs (from El Argoub toward the sector of Garitas) bordering the Rio de Oroand Dakhla peninsula, Morocco. These fossiliferous outcrops of the Samlat Formation (Fm.) have yielded abundant fossil material of sharks and rays dating from the late Eocene (Adnet et al., 2010), subsequently confirmed as early to mid Priabonian (Underwood et al., 2011; Zouhri et al., 2014). Here, we updated data in adding original material coming fromtwouppermost levels of the Samlat Fm.(Dakhla level C1 and C2 in Benammi et al., 2014, submitted) and dated tolate Priabonian/early Rupelian. About fifty taxa were recovered along thefour main levelsranging from the early Priabonian up to the early Rupelian, including for instance Otodus (Carcharocles) sokolowi, Xiphodolamia serrata, Tethylamnatwiggsensis, Hemipristis curvatus, Carcharhinus frequens, Misrichthys stromeri, Odontorhytis pappenheimi,? Jacquhermania attiai, Aetobatus irregularis, and many new taxa currently under study (eg, Pastinachus sp., Galeocerdo aff. eaglesomei). Even if there are some reminiscences with the rare Paleogene faunas from West Africa, this Moroccan elasmobranch fauna appears strikinglysimilar to some recovered from the contemporaneous Egyptian localities, being clearly representative of an open marine environment that was frequented bymany archaeocetes during the late Eocene (eg, Gehannamto Qasr el-Sagha inWadi-Al Hitan, Egypt). In contrast, the latest Priabonian and early Rupelian are deposited in shallower and subcontinental environments, respectively (eg, Birket Qarun and Jebel QatraniFm. in Fayum, Egypt). These observations suggest a strong interconnectivity between these marine provinces, reflect the existence of roughly similar tropical environment, and an EW synchronous change in relative sea level on the North African coastal shelf during the global cooling recorded at the Eocene/Oligocene transition (eg, Berggren and Prothero, 1992; Zachos et al., 2008).