![]() ![]() The assemblage includes also an identified suite comprising Thrinacodus ferox, Bransonella cf. A new genus and species, Cromhallia parvunda, of indeterminate phylogenetic relationships, is also erected. They belong to Jalodus, Ctenacanthiformes, Protacrodus, Orodus, Chomatodus, Petalodontidae, Euchondrocephali?, Helodus and Psephodus. Owing to low specimen numbers and uncertainty of intraspecific character, 10 types of teeth are left in open nomenclature, although it is likely they represent new taxa. The Carboniferous teeth are derived fossils, released during subaerial dissolution of the surrounding limestones. These Carboniferous teeth have been found within a much larger assemblage of disarticulated bones and teeth belonging to small late Triassic terrestrial reptiles, for which Cromhall quarry is famous. Palaeontology, 55: 1245–1263Ībstract: Sixteen different Lower Carboniferous (Tournaisian Courceyan to Chadian age, Mississippian) chondrichthyan teeth types have been extracted from Triassic erosional/aeolian fills in shallow karst systems found in the limestone quarry at Cromhall, Gloucestershire, England. (2012): A carboniferous chondrichthyan assemblage from residues within a Triassic karst system at Cromhall quarry, Gloucestershire, England. This research revises and elucidates lamnid shark evolution based on the calibration of the Neogene Pisco Formation.īEHAN, C. The recalibration of the absolute dates suggests that Carcharodon hubbelli sp. We also provide a recalibration of critical fossil horizons within the Pisco Formation, Peru using zircon U-Pb dating and strontium-ratio isotopic analysis. hastalis include a mesially slanted third anterior (intermediate) tooth. carcharias include the presence tooth serrations and a symmetrical first upper anterior tooth that is the largest in the tooth row, while those indicative of C. Specimens from the Pisco Formation clearly demonstrate an evolutionary mosaic of characters of both recent C. – a taxon that demonstrates a transition between C. New fossil evidence presented in this study suggests that the genus is derived from the broad-toothed ‘mako’, Carcharodon (Cosmopolitodus) hastalis, and includes the new species C. Palaeontology, 55: 1139–1153Ībstract: The taxonomic origin of the white shark, Carcharodon, is a highly debated subject. ![]() ![]() (2012) : Origin of the white shark Carcharodon (Lamniformes: Lamnidae) based on recalibration of the Upper Neogene Pisco Formation of Peru. Please support and send missing papers (not listed papers or papers without the infosymbol) to described species:ĮHRET, D.J. Shark-References would kindly like to ask you for your contribution to this project. Please send your images to shark-references ! Joachim Seidel, Germany for the image of Carcharhinus longimanus (POEY, 1861): NICK COBURN PHILLIPS, Explorer ~ Marine Scientist & Cameraman, Creator of BORNEO SHARKARMA for the images of Trygonorrhina dumerilii (CASTELNAU, 1873), the first record ot this species in Borneo!:
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