Journal : Acta Geologica Polonica
Article : The taxonomic value of rostral nodes of extinct sharks, with comments on previous records of the genus Lamna (Lamniformes, Lamnidae) from the Pliocene of Lee Creek Mine, North Carolina (USA)

Authors :
Fedorowski, J.
Institute of Geology, Adam Mickiewicz University, Maków Polnych 16, PL-61-606 Poznań, Poland, jerzy@amu.edu.pl,
Lehmann, J.
Faculty of Geosciences, University of Bremen, Klagenfurter Strasse, 28357 Bremen, Germany, jens.lehmann@uni-bremen.de,
Nagm, E.
Geology Department, Faculty of Science, Al-Azhar University, Assiut, Egypt, emad.nagm@yahoo.com,
Machalski, M.
Institute of Paleobiology, Polish Academy of Sciences, ul. Twarda 51/55, PL-00-818 Warszawa, mach@twarda.pan.pl,
Mollen, F.
Elasmobranch Research, Meistraat 16, B-2590 Berlaar, Belgium, frederik.mollen@telenet.be,
Abstract : Shark rostral nodes from the Yorktown Formation (Zanclean, early Pliocene) of Lee Creek Mine, North Carolina (USA), previously assigned to the genus Lamna Cuvier, 1816, have been reinterpreted using a preliminary identification key for extant Lamniformes based on rostral morphology. In addition, the fossil rostral nodes have been compared in detail with Recent material of both the porbeagle, Lamna nasus (Bonnaterre, 1788) and the salmon shark, Lamna ditropis Hubbs and Follet, 1947. Despite the fact that the rostra compared relatively well with those of Recent Lamna, the Lee Creek Mine specimens proved to differ significantly in having near-parallel lateral rostral cartilages that join the rostral node individually, instead of abutting ones. Based on this observation, we here propose to strike the genus Lamna from the Lee Creek Mine faunal list, so long as no other diagnostic material is forthcoming. These partially preserved rostra are likely to have belonged to extinct taxa within the families Lamnidae or Otodontidae, both of which have been documented from the Yorktown Formation on the basis of isolated teeth of at least three species, Cosmopolitodus hastalis (Agassiz, 1838), Megaselachus megalodon (Agassiz, 1835) and Parotodus benedenii (Le Hon, 1871).

Keywords : kolec czołowy, lamna pacyficzn, Lamnowate, tomografia komputerowa, żarłacz, żarłacz śledziowy, Carcharodon, Cosmopolitodus, CT scans, Lamna ditropis, Lamna nasus, Lamnidae, Megaselachus, Otodontidae, Parotodus, Rostral node, Rostrum,
Publishing house : Faculty of Geology of the University of Warsaw
Publication date : 2012
Number : Vol. 62, no. 1
Page : 117 – 127

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DOI :
Qute : Fedorowski, J. ,Lehmann, J. ,Nagm, E. ,Machalski, M. ,Mollen, F. ,Mollen, F. , The taxonomic value of rostral nodes of extinct sharks, with comments on previous records of the genus Lamna (Lamniformes, Lamnidae) from the Pliocene of Lee Creek Mine, North Carolina (USA). Acta Geologica Polonica Vol. 62, no. 1/2012
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