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Foss. Rec., 21, 119-135, 2018
https://doi.org/10.5194/fr-21-119-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
13 Apr 2018
New information on the Cenomanian bothremydid turtle Algorachelus based on new, well-preserved material from Spain
Adán Pérez-García Grupo de Biología Evolutiva, Facultad de Ciencias, UNED, Paseo de la Senda del Rey 9, 28040 Madrid, Spain
Abstract. Algorachelus peregrinus is the oldest representative of the crown group Pleurodira known in Laurasia. The type locality of this bothremydid is Algora, situated in central Spain, at levels deposited during the uppermost middle–lowermost upper Cenomanian. A new excavation was recently carried out in this town. As a result, abundant material of Algorachelus peregrinus has been found. Several complete shells, as well as numerous partial carapaces and plastra, are presented here. The abundance of remains allows the analysis of the general patterns by which some of the shells of this littoral form were partially or totally disarticulated. The analysis of these remains not only shows several pathologies but also improves the knowledge about the anatomy and intraspecific variability of Algorachelus peregrinus. This new information allows the revision of other Cenomanian forms of Bothremydidae, both from the Middle East and from North America. Thus, Algorachelus is identified in these regions, being represented in the early or middle Cenomanian of Palestine by the new combination Algorachelus parvus, and in the uppermost Cenomanian of Utah by the new combination Algorachelus tibert. Therefore, a relatively fast and widely distributed geographic dispersion event is recognized, corresponding to the oldest dispersal event so far identified for a lineage of Pleurodira from Gondwana to Laurasia.
Citation: Pérez-García, A.: New information on the Cenomanian bothremydid turtle Algorachelus based on new, well-preserved material from Spain, Foss. Rec., 21, 119-135, https://doi.org/10.5194/fr-21-119-2018, 2018.
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Short summary
The Spanish Algorachelus peregrinus is the oldest pleurodiran turtle known in the Northern Hemisphere. New material is presented, including several shells. The patterns by which some of them were disarticulated are analyzed. Several pathologies are identified. The knowledge about the anatomy and intraspecific variability is improved. Algorachelus is recognized in the Middle East and North America. The oldest known dispersal event of Pleurodira from Gondwana to Laurasia is characterized.
The Spanish Algorachelus peregrinus is the oldest pleurodiran turtle known in the Northern...
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