Revision of the sixgill sawsharks, genus Pliotrema (Chondrichthyes, Pristiophoriformes), with descriptions of two new species and a redescription of P. warreni Regan

@article{Weigmann2020RevisionOT,
  title={Revision of the sixgill sawsharks, genus Pliotrema (Chondrichthyes, Pristiophoriformes), with descriptions of two new species and a redescription of P. warreni Regan},
  author={Simon Weigmann and Ofer Gon and Ruth H. Leeney and Ellen Barrowclift and Per Berggren and Narriman Jiddawi and Andrew J Temple},
  journal={PLoS ONE},
  year={2020},
  volume={15}
}
Recent sampling efforts in Madagascar and Zanzibar, as well as examinations of six-gilled sawsharks in several museum collections provided evidence for a complex of species within Pliotrema warreni Regan. The present manuscript contains a redescription of P. warreni involving the syntypes and additional material, as well as formal descriptions of two new species of Pliotrema Regan. All specimens of both new species were found in the western Indian Ocean. Individuals of the first new species… 
The First Fossil Record of the Sawshark Pliotrema (Pristiophoridae) from the Neogene of the Southeastern Pacific (Chile)
Abstract. We present the first fossil record of the sawshark genus Pliotrema from the south-eastern Pacific Ocean. The examined material was obtained from a little-known fossil locality named “Arenas
Struggling with age: Common sawsharks (Pristiophorus cirratus) defy age determination using a range of traditional methods
TLDR
This research calls for further work into age validation and development of novel techniques to accurately age sawsharks.

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