Middle Jurassic Tethyan–Boreal ostracod faunal links: a case study from the Callovian of Portugal

Abstract

Late Callovian (athleta Chronozone) age sediments of Pedrogao, westcoast Portugal, yielded a low diversity ostracod assemblage withrelatively little in common with coeval NW European assemblages exceptat the weak level of comparative (cf.) species identification. Five newmarine species are described (Neurocythere multiforma sp. nov.,Palaeocytheridea (Malzevia)? dorsocostata sp. nov., Praebythoceratinaparascrobiculata sp. nov., Praeschuleridea lisensis sp. nov.,Virgulacytheridea posteroacuminata sp. nov.) and three previouslydescribed non-marine species recorded that so far are indigenous toPortugal (Septacandona azeredae, Sinuocythere pedrogaensis,Theriosynoecum helmdachi). Ostracod taxonomic links to western Tethysare evident but weak. Calcareous nannofossil assemblages were analysedfor biostratigraphical control.