Paraisurus

Paraisurus Temporal range: Aptian-Albian PreꞒ Ꞓ O S D C P T J K Pg N
Teeth of P. macrorhizus
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Subclass:	Elasmobranchii
Division:	Selachii
Order:	Lamniformes
Family:	† Paraisuridae Herman, 1979 [1]
Genus:	† Paraisurus Glickman, 1957 [2]
Type species
†Paraisurus macrorhizus (Pictet & Campiche, 1858) [3]
Species
†Paraisurus compressusSokolov 1978 [4] [5] †Paraisurus macrorhizusPictet and Campiche 1858 [5] [3]
Synonyms
Species synonymy Paraisurus macrorhizus Oxyrhina macrorhizaPictet & Campiche, 1858 Paraisurus compressus Paraisurus amudarjensisMertinienė, Nessov, & Nazarkin, 1994 [6]

Paraisurus is an extinct genus of mackerel sharks that lived during the Cretaceous period. It contains four valid species, which have been found in Europe, Asia, North America, and Australia. ^[7] A fifth species, P. amudarjensis, is now considered a synonym of P. compressus. ^[8] While this genus is mostly known from isolated teeth, an associated dentition of P. compressus was found in the Weno Formation of Texas. ^[9] It went extinct around the Albian-Cenomanian boundary, as a supposed Coniacian occurrence of "P. sp." is likely a misidentified pseudoscapanorhynchid. ^[10]

References

1. Herman, Jacques (1979). "Réflexions sur la systématique des Galeoidei et sur les affinités du genre Cetorhinus à l'occasion de la découverte d'éléments de la denture d'un exemplaire fossile dans les Sables du Kattendijk à Kallo (Pliocène inférieur, Belgique)". Annales de la Société géologique de Belgique. 102 (1): 357–377.
2. Glickman, L.S. (1957). "O geneticheskoy svyazi semeystva Lamnidae i Odontaspidae i novykh rodakh verkhnemelovykh lamnid [On the genetic relationship between the families Lamnidae and Odontaspidae and new genera of Upper Cretaceous lamnids]" (PDF). Trudy Geologicheskogo Muzeya imeni A.P. Karpinskogo. 1: 110–117.
3. Pictet, F.J.; Campiche, G. (1858–1860). Description des fossiles du terrain crétacé des environs de Sainte-Croix. Première partie. Geneva: J. Kessmann & H. Georg.
4. Sokolov, M.I. (1978). Zuby akul kak rukovodyashchiye iskopayemyye pri zonalʹnom raschlenenii melovykh otlozheniy Turanskoy plity [Shark teeth as guiding fossils in the zonal division of the Cretaceous deposits of the Turan Plate]. Moscow: Nedra.
5. "PBDB Taxon".
6. Mertinienė, R.; Nessov, L.; Nazarkin, M. (1994). "Cretaceous sharks of the genus Paraisurus in Uzbekistan and Lithuania". Geologija. 17: 139–143.
7. Cappetta, H. (2012). Handbook of Paleoichthyology. Volume 3E. Chondrichthyes. Mesozoic and Cenozoic Elasmobranchii: Teeth. Munich: Verlag Dr. Friedrich Pfeil. ISBN   978-3-89937-148-2.
8. 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. doi:10.4435/BSPI.2021.07 (inactive 12 July 2025).
9. Welton, B.J.; Farish, R.F. (1993). The Collector's Guide to Fossil Sharks and Rays from the Cretaceous of Texas (PDF). Lewisville, TX: Before Time. ISBN   0-9638394-0-3.
10. Siversson, M.; Machalski, M. (2017). "Late late Albian (Early Cretaceous) shark teeth from Annopol, Poland". Alcheringa. 41 (4): 433–463. Bibcode:2017Alch...41..433S. doi:10.1080/03115518.2017.1282981. S2CID   133123002.