Original Paper

Palaeobiodiversity and Palaeoenvironments

, Volume 90, Issue 3, pp 241-257

First online:

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

  • Stefanie KlugAffiliated withStaatliches Museum für Naturkunde StuttgartDepartment of Earth Sciences, University of Bristol Email author 
  • , Thomas TütkenAffiliated withSteinmann-Institut für Geologie, Mineralogie und Paläontologie, Universität Bonn
  • , Oliver WingsAffiliated withMuseum für Naturkunde Berlin, Leibniz-Institut für Evolutions- und Biodiversitätsforschung, Humboldt-Universität zu Berlin
  • , Hans-Ulrich PfretzschnerAffiliated withInstitut für Geowissenschaften, Universität Tübingen
  • , Thomas MartinAffiliated withSteinmann-Institut für Geologie, Mineralogie und Paläontologie, Universität Bonn

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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 Formation Liuhuanggou Hybodus sp. cf. H. huangnidanensis Jiaodontus montaltissimus gen. et sp. nov. Jiaodontus vedenemus gen. et sp. nov. stable isotopes