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Swiss Journal of Geosciences

, Volume 104, Supplement 1, pp 107–114 | Cite as

A new Jurassic cow shark (Chondrichthyes, Hexanchiformes) with comments on Jurassic hexanchiform systematics

  • Jürgen Kriwet
  • Stefanie Klug
Article

Abstract

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).

Keywords

Notidanusserratus Hexanchus? wiedenrothi Crassodontidanus gen. nov. Crassonotidae fam. nov. Jurassic Nusplingen Plattenkalke 

Institutional abbreviations

SMNS

State Museum of Natural History Stuttgart, Germany

GPIT

Palaeontology Department and Museum, Institute of Geosciences, Eberhard-Karls University Tübingen, Germany

NHMUK PV

Natural History Museum, London, United Kingdom

Notes

Acknowledgments

We are indebted to R. Böttcher (Staatliches Museum für Naturkunde Stuttgart, Germany), Z. Johanson (Natural History Museum London, U.K.), G. Clement (Muséum national d’Histoire naturelle, Paris, France), H.-U. Pfretzschner (University of Tübingen, Germany) and W. Werner (Bayerische Staatssammlung für Paläontologie und Geologie, Munich, Germany) for providing access to material under their care. We also thank J. G. Maisey (American Museum of Natural History, New York, USA) and C. J. Underwood (Birbeck College, London, UK) for discussing morphological and taxonomic aspects of hexanchiform sharks in the course of this project. G. Cuny (Kopenhagen, Denmark) and C.J. Underwood (London, UK) are thanked for their contributions and comments as reviewers of this manuscript. This study was part of a project on Jurassic selachians from Europe, which was financially supported by the German Research Foundation (DFG) under contract numbers KR 2307/3-1 and KR 2307/3-2. Additional financial support was received from the SYNTHESYS Project (FR-TAF-612) and a Marie Curie Individual Fellowship to SK (FP7-PEOPLE-2009-IEF, no. 252750).

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Copyright information

© Swiss Geological Society 2011

Authors and Affiliations

  1. 1.Department of PalaeontologyUniversity of ViennaViennaAustria
  2. 2.Department of Earth SciencesUniversity of BristolBristolUK

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