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Abstract. Eochelone voltregana n. sp. is a new marine cryptodiran cheloniidfound at the Priabonian levels (latest Eocene) of the Vespella marls member ofthe Vic–Manlleu marls formation. It is the second cheloniid from SantaCecilia de Voltrega (Osona County, Spain), the first one beingOsonachelus decorata from the same formation. Shell parametersindicate that the new species belongs to a branch of sea turtles includingthe Eocene Anglo–Franco–Belgian forms Argillochelys, Puppigerus and Eochelone (the shell of the latter was studied herefor the first time) as well as Glarichelys from the Oligocene ofSwitzerland, all of them predating the worldwide living Miocene genera. Thedescription of two other more littoral–continental Eocene species is given:Trionyx sp., from an older layer of the same formation; and thepodocnemidid erymnochelyine,Cordichelys from a more basal layer of a middle Eocene (Lutetian)formation. The last one is identified as the only evidence of theShweboemys subgroup in the European record, being distinct from theother known Osona County pleurodire Eocenochelus farresi, which is amember of the Erymnochelys group (same subfamily), from the youngerPriabonian Sant Marti Xic layer. Thus, an update on the marine turtlefauna of the eastern Ebro Basin that variably opened in the east duringEocene times is provided. The turtles of Osona County belong to two subordersand five genera with three new species and extend the known distribution oftheir families (LSIDurn:lsid:zoobank.org:act:48CE8676-7B82-4EF2-8165-27BEE90129F2).

The turtles from the upper Eocene, Osona County (Ebro Basin, Catalonia, Spain): new material and its faunistic and environmental context