Paraisurus Explained

Paraisurus is an extinct genus of mackerel sharks that lived during the Cretaceous. It contains four valid species, which have been found in Europe, Asia, North America, and Australia.[1] A fifth species, P. amudarjensis, is now considered a synonym of P. compressus.[2] While this genus is mostly known from isolated teeth, an associated dentition of P. compressus was found in the Weno Formation of Texas.[3] It went extinct around the Albian-Cenomanian boundary, as a supposed Coniacian occurrence of "P. sp." is likely a misidentified pseudoscapanorhynchid.[4]

Notes and References

  1. Book: Cappetta, H. . 2012 . Handbook of Paleoichthyology. Volume 3E. Chondrichthyes. Mesozoic and Cenozoic Elasmobranchii: Teeth. . Munich . Verlag Dr. Friedrich Pfeil . 978-3-89937-148-2.
  2. Amalfitano . J. . 2021 . Reappraisal of the record of the genus Paraisurus (Chondrichthyes; Lamniformes) from the Lower Cretaceous of northern Italy . Bollettino della Società Paleontologica Italiana . 60 . 2 . 157–167 . 10.4435/BSPI.2021.07 .
  3. Book: Welton . B.J. . Farish . R.F. . 1993 . The Collector's Guide to Fossil Sharks and Rays from the Cretaceous of Texas . Lewisville, TX . Before Time . 0-9638394-0-3 .
  4. Siversson . M. . Machalski . M. . 2017 . Late late Albian (Early Cretaceous) shark teeth from Annopol, Poland . Alcheringa . 41 . 4 . 433–463 . 10.1080/03115518.2017.1282981. 2017Alch...41..433S . 133123002 .

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