Palaeobiodiversity and Palaeoenvironments

, Volume 90, Issue 3, pp 241–257

A Late Jurassic freshwater shark assemblage (Chondrichthyes, Hybodontiformes) from the southern Junggar Basin, Xinjiang, Northwest China

Authors

    • Staatliches Museum für Naturkunde Stuttgart
    • Department of Earth SciencesUniversity of Bristol
  • Thomas Tütken
    • Steinmann-Institut für Geologie, Mineralogie und PaläontologieUniversität Bonn
  • Oliver Wings
    • Museum für Naturkunde Berlin, Leibniz-Institut für Evolutions- und BiodiversitätsforschungHumboldt-Universität zu Berlin
  • Hans-Ulrich Pfretzschner
    • Institut für GeowissenschaftenUniversität Tübingen
  • Thomas Martin
    • Steinmann-Institut für Geologie, Mineralogie und PaläontologieUniversität Bonn
Original Paper

DOI: 10.1007/s12549-010-0032-2

Cite this article as:
Klug, S., Tütken, T., Wings, O. et al. Palaeobio Palaeoenv (2010) 90: 241. doi:10.1007/s12549-010-0032-2

Abstract

A low-diversity hybodont assemblage from the Late Jurassic (Oxfordian) Qigu Formation at Liuhuanggou in the southern Junggar Basin includes the remains of three taxa based on isolated teeth, two of which represent new species of a hitherto unknown genus: Hybodus sp. cf. H. huangnidanensis Wang, 1977, Jiaodontus montaltissimus gen. et sp. nov., and Jiaodontus vedenemus gen. et sp. nov. H. sp. cf. H. huangnidanensis might represent a new taxon pending future revisions. The two new species of Jiaodontus gen. nov. are assigned to the Lonchidiidae and represent endemic species, which are only known from the Junggar Basin. Their teeth superficially resemble those of other lonchidiids, such as Parvodus and Vectiselachos, but differ in several aspects, including the morphology of the cusp and cusplets and the ornamentation pattern. Two different morphotypes of dermal denticles with hybodont affinities, possibly representing two species, are described. The low enameloid δ18OPO4 values [9.7 ± 0.4‰ (standard deviation), n = 5) of H. sp. cf. H. huangnidanensis teeth indicate that at least this taxon was completely adapted to freshwater. This is in good accordance with the depositional setting and sedimentological results.

Keywords

Qigu FormationLiuhuanggouHybodus sp. cf. H. huangnidanensisJiaodontus montaltissimus gen. et sp. nov.Jiaodontus vedenemus gen. et sp. nov.stable isotopes

Copyright information

© Senckenberg, Gesellschaft für Naturforschung and Springer 2010