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Volume 21, issue 2 | Copyright

Special issue: Secondary adaptation of tetrapods to life in water...

Foss. Rec., 21, 237-284, 2018
https://doi.org/10.5194/fr-21-237-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 28 Sep 2018

Research article | 28 Sep 2018

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

France de Lapparent de Broin1, Xabier Murelaga2, Adán Pérez-García3, Francesc Farrés4, and Jacint Altimiras4 France de Lapparent de Broin et al.
  • 1Centre de Recherches sur la Paléobiodiversité et les Paléoenvironnements (CR2P: MNHN, CNRS, UPMC-Paris 6), Muséum national d'Histoire naturelle, Sorbonne Université, 57 rue Cuvier, CP 38, 75231 Paris CEDEX 5, France
  • 2Departamento de Estratigrafía y Paleontología, Facultad de Ciencia y Tecnología, UPV/EHU, Sarrienea s/n, 48940 Leioa, Spain
  • 3Grupo de Biología Evolutiva, Facultad de Ciencias, UNED, Paseo de la Senda del Rey 9, 28040 Madrid, Spain
  • 4Museu Geològic del Seminari de Barcelona, Diputacio 231, 08007 Barcelona – Geolab Vic, Spain

Abstract. Eochelone voltregana n. sp. is a new marine cryptodiran cheloniid found at the Priabonian levels (latest Eocene) of the Vespella marls member of the Vic–Manlleu marls formation. It is the second cheloniid from Santa Cecília de Voltregà (Osona County, Spain), the first one being Osonachelus decorata from the same formation. Shell parameters indicate that the new species belongs to a branch of sea turtles including the Eocene Anglo–Franco–Belgian forms Argillochelys, Puppigerus and Eochelone (the shell of the latter was studied here for the first time) as well as Glarichelys from the Oligocene of Switzerland, all of them predating the worldwide living Miocene genera. The description of two other more littoral–continental Eocene species is given: Trionyx sp., from an older layer of the same formation; and the podocnemidid erymnochelyine, Cordichelys from a more basal layer of a middle Eocene (Lutetian) formation. The last one is identified as the only evidence of the Shweboemys subgroup in the European record, being distinct from the other known Osona County pleurodire Eocenochelus farresi, which is a member of the Erymnochelys group (same subfamily), from the younger Priabonian Sant Martí Xic layer. Thus, an update on the marine turtle fauna of the eastern Ebro Basin that variably opened in the east during Eocene times is provided. The turtles of Osona County belong to two suborders and five genera with three new species and extend the known distribution of their families (LSID urn:lsid:zoobank.org:act:48CE8676-7B82-4EF2-8165-27BEE90129F2).

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We give closure on the study cycle of turtle material from Vic area, Middle–Late Eocene, Ebro Basin, Catalonia, Spain. Numerous comparisons with poorly known taxa are carried out, including a first description of the Eochelone shell via E. voltragana. Different swimming evolutionary states and different cheloniid subgroups Osonachelus and Eochelone are described, as well as dispersion Gondwanan forms from Africa and around European coasts.
We give closure on the study cycle of turtle material from Vic area, Middle–Late Eocene, Ebro...
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