The West Gondwanan Occurrence Of The Hybodontid Shark Priohybodus, And The Late Jurassic–Early Cretaceous Age Of The Tacuarembó Formation, Uruguay

Abstract

ABSTRACT. Priohybodus cf. P. arambourgi is reported for the ®rst time from the Tacuarembo  Formation of Uruguay. This species is a hybodontid shark known previously only from Upper Jurassic and Lower Cretaceous deposits of Saharan Africa and the Arabian Peninsula. The material (22 isolated teeth and a dorsal ®n spine) was found in a thin bone bed, associated with abundant bone fragments, scales and teeth of semionotiform ®shes and theropod dinosaurs. Until now, the age of the Tacuarembo  Formation has been dif®cult to determine because its fossil content lacked useful biostratigraphic indicators. The ®nding of Priohybodus cf. P. arambourgi in that unit greatly expands the palaeobiogeographic range of the species, and allows us to propose a Late Jurassic±Early Cretaceous age for the Tacuarembo  Formation.

The “Continental Intercalaire” of southern Tunisia: Stratigraphy, paleontology, and paleoecology

“…This taxon has been previously reported from Late Jurassic deposits of Somalia, Ethiopia, Yemen, and Uruguay, as well as from the Early Cretaceous of Libya (Duffin, 2001;Perea et al, 2001;Cuny et al, 2004;Le Loeuff et al, 2010;Soto et al, 2012). In this study we consider this taxon as a biostratigraphic marker for the lower Douiret Formation.…”

An Early Cretaceous vertebrate assemblage from the Cabao Formation of NW Libya

“…Priohybodus is known only from East and Northeast Africa (Somalia, Ethiopia, Tunisia, Libya) in the Late Jurassic and the Early Cretaceous but is unknown from the contemporaneous localities of West Africa. This might suggest some kind of endemism for this freshwater hybodont but its recent discovery in probably Late Jurassic levels in Uruguay (Perea et al 2001) rather suggests that its absence in Niger or Morocco may reflect stratigraphical and/or environmental differences. P. arambourgi might be restricted to a Late Jurassic-earliest Cretaceous interval.…”

A Late Jurassic fossil assemblage in Gondwana: Biostratigraphy and correlations of the Tacuarembó Formation, Parana Basin, Uruguay

“…The best-known body fossils from these sedimentary rocks in South America come from the southernmost part of their distribution, in Uruguay, where they are known locally as the Tacuarembó Formation. teeth, spines, and molds of bones concentrated in thin and patchy bonebeds (see Perea et al, 2001Perea et al, , 2003.…”