caa a22 4500 445839538 CHVBK 20180317145339.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1007/s00015-011-0075-z doi (NATIONALLICENCE)springer-10.1007/s00015-011-0075-z A new Jurassic cow shark (Chondrichthyes, Hexanchiformes) with comments on Jurassic hexanchiform systematics [Elektronische Daten] [Jürgen Kriwet, Stefanie Klug] A new taxon, †Crassodontidanus gen. nov. of Hexanchiformes (cow sharks) from the Jurassic of Germany is described. It is characterized by peculiar teeth combining apomorphic (serrated mesial cutting edge of the main cusp) and plesiomorphic features (deep root with convex mesial and distal margins in labial and lingual views; protruding lingual root bulge). This character combination readily distinguishes members of the new taxon from all other known extant (Heptranchias, Hexanchus, Notorynchus) and extinct (†Gladioserratus, †Notidanodon, †Notidanoides, †Pachyhexanchus, †Paraheptranchias, †Weltonia) hexanchiforms. Currently, two species, †C. serratus (type species; Late Jurassic, Late Kimmeridgian of Nusplingen, South Germany) and †C. wiedenrothi (Early Jurassic, Early Pliensbachian of Gretenberg (Hanover), North Germany) are assigned to this taxon. †Crassodontidanus gen. nov. is member of †Crassonotidae fam. nov. and sister to †Notidanoides Maisey, 1986 and †Pachyhexanchus Cappetta, 1990. We consider †Notidanus amalthei Oppel, 1854 from the Pliensbachian of South Germany, †Notidanus insignis Seguenza, 1887 from the Oxfordian of Sicily (Italy) and †Notidanus wagneri Agassiz, 1843 from the Early Tithonian of Solnhofen (South Germany) nomina dubia and nomina nuda, respectively. The family †Crassonotidae comprises plesiomorphic hexanchiforms ranging from the Sinemurian (Early Jurassic) to the Hauterivian (Early Cretaceous). Swiss Geological Society, 2011 Notidanus serratus nationallicence Hexanchus ? wiedenrothi nationallicence Crassodontidanus gen. nov nationallicence Crassonotidae fam. nov nationallicence Jurassic nationallicence Nusplingen Plattenkalke nationallicence SMNS : State Museum of Natural History Stuttgart, Germany nationallicence GPIT : Palaeontology Department and Museum, Institute of Geosciences, Eberhard-Karls University Tübingen, Germany nationallicence NHMUK PV : Natural History Museum, London, United Kingdom nationallicence Kriwet Jürgen Department of Palaeontology, University of Vienna, Althanstr. 14, 1090, Vienna, Austria aut Klug Stefanie Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, BS8 1RJ, Bristol, UK aut Swiss Journal of Geosciences SP Birkhäuser Verlag Basel 104(2011-12-01), 107-114 1661-8726 104<107 2011 104 15 https://doi.org/10.1007/s00015-011-0075-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00015-011-0075-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kriwet Jürgen Department of Palaeontology, University of Vienna, Althanstr. 14, 1090, Vienna, Austria aut NATIONALLICENCE 700 1- Klug Stefanie Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, BS8 1RJ, Bristol, UK aut NATIONALLICENCE 773 0- Swiss Journal of Geosciences SP Birkhäuser Verlag Basel 104(2011-12-01), 107-114 1661-8726 104<107 2011 104 15 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer