The trilobites Prophalaron gen. nov. (Calymenidae) and Dicranurus (Odontopleuridae) from the Upper Ordovician of New South Wales

David J. Holloway*, Patrick M. Smith, Geoff Thomas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Previously undescribed trilobites from the Late Ordovician (latest Eastonian, mid Katian) Gunningbland Formation of central New South Wales include the calymenid Prophalaron jonesi gen. et sp. nov. and the odontopleurid Dicranurus webbyi sp. nov. Prophalaron resembles some members of the Reedocalymeninae, in particular Neseuretinus, in the presence of a relatively long, convex preglabellar field and a short, upturned anterior border. However, this similarity is a result of convergence, and other characters such as the weaker vaulting of the cephalon and pygidium as well as the hypostomal morphology indicate that Prophalaron belongs to the Calymeninae. Dicranurus webbyi is the first odontopleurid recorded from the Ordovician of Australia. The species lacks the reduction in length of the fifth thoracic segment and its posterior pleural spine that have been suggested as diagnostic of the genus.

Original languageEnglish
Pages (from-to)253-264
Number of pages12
Issue number2
Publication statusPublished - 2020


  • Trilobita
  • Calymenidae
  • Odontopleuridae
  • Upper Ordovician
  • New South Wales
  • taxonomy

Cite this