Icriobranchiocarcinus rodas Vega n. sp., is recorded from lower Maastrichtian (Upper Cretaceous) Arroyo Grande Formation near the town of Rodas (Central Cuba). I. sp. represents additional evidence paleobiogeographic affinities between Chiapas (SE Mexico) and Cuba, during Late Cretaceous. The genus Vega, 2018 in et al., was erected type species tzutzu Ocozocoautla Forma-tion (Chiapas). preserve...

Debate continues about the nature of the Cretaceous-Paleogene (K-Pg) mass extinction event. An abrupt crisis triggered by a bolide impact contrasts with ideas of a more gradual extinction involving flood volcanism or climatic changes. Evidence from high latitudes has also been used to suggest that the severity of the extinction decreased from low latitudes towards the poles. Here we present a r...

The Arkadelphia Formation—Midway Group (Maastrichtian—Paleocene) contact near Malvern, Arkansas preserves a K-Pg boundary assemblage of turtle species consisting of skull, shell, and non-shell postcranial skeletal elements. The Malvern turtles are preserved within a coquina lag deposit that comprises the basalmost Midway Group and also contains an abundance of other reptiles, as well as chondri...

Tyrannosaurid theropods were dominant terrestrial predators in Asia and western North America during the last of the Cretaceous. The known diversity of the group has dramatically increased in recent years with new finds, but overall understanding of tyrannosaurid ecology and evolution is based almost entirely on fossils from latitudes at or below southern Canada and central Asia. Remains of a n...

An assemblage of large and robust pedunculate scalpellomorph cirripede barnacles from the Maastrichtian Kalaat Senan (Tunisia) is described, their stratigraphical position within Abiod El Haria formations noted. Four taxa are documented, three which confined to area, namely Pachyscalpellum heltzeli , Cretiscalpellum robaszynskii sp. nov. Diotascalpellum sp.; fourth, curvatum was previously reco...

Abstract The standard reconstruction of species Orbitoides d’Orbigny into a single lineage during the late Santonian to end Maastrichtian is based upon morphometric data from Western Europe. An irreversible increase in size embryonic apparatus, and formation greater number epi-embryonic chamberlets (EPC) with time, regarded as main evolutionary trends used discrimination. However, assemblages C...

BACKGROUND Tyrannosaurus rex was one of the largest terrestrial carnivores of all time, and consequently its ecology and diet have been the focus of much discussion. However, there is little direct evidence of diet or feeding habits in this species. METHODOLOGY/PRINCIPAL FINDINGS Examination of museum collections has revealed four specimens of Tyrannosaurus rex that bear tooth marks made by l...

Since the early l990s the Chicxulub crater on Yucatan, Mexico, has been hailed as the smoking gun that proves the hypothesis that an asteroid killed the dinosaurs and caused the mass extinction of many other organisms at the Cretaceous-Tertiary (K-T) boundary 65 million years ago. Here, we report evidence from a previously uninvestigated core, Yaxcopoil-1, drilled within the Chicxulub crater, i...

Here we report multiple lamniform shark teeth recovered from fluvial sediments in the (Campanian-Maastrichtian) Cerro Fortaleza Formation, Santa Cruz Province, Argentina. This small tooth assemblage is compared to various lamniform sharks possessing similar dental morphologies, including Archaeolamna, Cretalamna, Dwardius, Dallasiella, and Cretodus. Although the teeth share numerous morphologic...

The age and depositional environment of the Harami Formation were reevaluated based on new larger benthic foraminiferal (LBF) data. LBF assemblage including Orbitoides medius (d'Archiac), O. megaloformis Papp Küpper, gruenbachensis Papp, Pseudomphalocyclus blumenthali Meriç, Omphalocyclus macroporus (Lamarck), Sirtina cf. orbitoidiformis Brönnimann Wirz, Hellenocyclina beotica Reichel, Lepidorb...