caa a22 4500 388110511 CHVBK 20180307125352.0 cr unu---uuuuu 161130s1999 xx s 000 0 eng 10.1017/S0263593300002509 doi S0263593300002509 pii (NATIONALLICENCE)cambridge-10.1017/S0263593300002509 Siverson Mikael Lund University, Department of Geology, Division of Historical Geology and Palaeontology, Solvegatan 13, S-223 62 Lund, Sweden A new large lamniform shark from the uppermost Gearle Siltstone (Cenomanian, Late Cretaceous) of Western Australia [Elektronische Daten] [Mikael Siverson] An association of 100 teeth and 15 vertebrae from a large, lamniform shark, is described from the uppermost part of the Gearle Siltstone in the Giralia Anticline, Southern Carnarvon Basin, Western Australia. The material represents a new genus and species: Cardabiodon ricki. The taxon is referred to the new family Cardabiodontidae on the basis of its dental formula and uniquely oversized lower lateroposterior teeth. Other characteristic features include a strong dignathic heterodonty and the presence of four anterior and approximately 14 lateroposterior toothfiles in both the upper and lower jaw. The size of the recovered vertebral centra indicates that the shark measured at least 5 m in total length. The species had a wide but possibly patchy distribution with additional occurrences in England and Kazakstan, where it is present in strata of Cenomanian age. Cardabiodon shares several key dental characters with Parotodus, known from Oligocene-Pliocene deposits. The latter taxon was previously grouped with the ‘mega-toothed' sharks of the genera Otodus and Carcharocles, but is here reassigned to the Cardabiodontidae. The nominal species Cretalamna woodwardi from the middle or late Cenomanian of southern England, is designated as the type species of the new genus Dwardius. The coeval nominal species Pseudoisurus tomosus from the Saratov region in Russia, is based on material that almost certainly includes C. ricki and/or D. woodwardi. Designation of a lectotype for P. tomosus and its proper documentation would probably allow either C. ricki or D. woodwardi to be synonomised with the older name P. tomosus. There is, however, a strong possibility that the syntypes of P. tomosus are lost. Until they are found, redescribed and compared carefully with the type material of C. ricki and D. woodwardi, P. tomosus is a name of doubtful application and therefore referred to as a women dubium Copyright © Royal Society of Edinburgh 1999 Transactions of the Royal Society of Edinburgh: Earth Sciences Royal Society of Edinburgh Scotland Foundation 90/1(1999), 49-66 0263-5933 90:1<49 1999 90 TRE https://doi.org/10.1017/S0263593300002509 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0263593300002509 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Siverson Mikael Lund University, Department of Geology, Division of Historical Geology and Palaeontology, Solvegatan 13, S-223 62 Lund, Sweden NATIONALLICENCE 773 0- Transactions of the Royal Society of Edinburgh: Earth Sciences Royal Society of Edinburgh Scotland Foundation 90/1(1999), 49-66 0263-5933 90:1<49 1999 90 TRE CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge