New information on the Cenomanian bothremydid turtle Algorachelus based on new, well-preserved material from Spain

摘要: Abstract. Algorachelus peregrinus is the oldest representative of crown group Pleurodira known in Laurasia. The type locality this bothremydid is Algora, situated central Spain, at levels deposited during uppermost middle–lowermost upper Cenomanian. A new excavation was recently carried out town. As a result, abundant material has been found. Several complete shells, as well numerous partial carapaces and plastra, are presented here. abundance remains allows analysis the general patterns by which some shells littoral form were partially or totally disarticulated. these not only shows several pathologies but also improves knowledge about anatomy and intraspecific variability peregrinus. This new information revision other Cenomanian forms Bothremydidae, both from Middle East North America. Thus, Algorachelus is identified regions, being represented early middle Cenomanian Palestine combination parvus, and uppermost Utah combination Algorachelus tibert. Therefore, a relatively fast widely distributed geographic dispersion event recognized, corresponding to the oldest dispersal so far for lineage from Gondwana