Paraisurus

{{short description|Extinct genus of sharks}}

{{Use dmy dates|date=August 2024}}

{{Automatic taxobox

| image = Paraisurus macrorhiza2.jpg

| image_alt =

| image_caption = Teeth of P. macrorhizus

| fossil_range = {{fossil range|125.0|100.5|Aptian-Albian}}

| taxon = Paraisurus

| authority = Glickman, 1957{{cite journal |last=Glickman |first=L.S. |date=1957 |title=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] |journal=Trudy Geologicheskogo Muzeya imeni A.P. Karpinskogo |volume=1 |pages=110–117 |url=http://elasmodus.com/images/pdf/Glickman-1957b_Genetic%20link%20in%20lamnoids.pdf}}

| parent_authority = Herman, 1979{{cite journal |last=Herman |first=Jacques |date=1979 |title=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) |journal=Annales de la Société géologique de Belgique |volume=102 |issue=1 |pages=357–377 |url=https://popups.uliege.be/0037-9395/index.php?id=4357}}

| type_species = {{extinct}}Paraisurus macrorhizus

| type_species_authority = (Pictet & Campiche, 1858){{cite book |last1=Pictet |first1=F.J. |last2=Campiche |first2=G. |date=1858–1860 |title=Description des fossiles du terrain crétacé des environs de Sainte-Croix. Première partie |location=Geneva |publisher=J. Kessmann & H. Georg |url=https://gallica.bnf.fr/ark:/12148/bpt6k65397362/f1.item }}

| subdivision_ranks = Species

| subdivision_ref =

| subdivision =

• {{extinct}}Paraisurus compressus Sokolov 1978{{cite book |last=Sokolov |first=M.I. |date=1978 |title=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] |location=Moscow |publisher=Nedra |url=https://www.geokniga.org/books/20185 }}{{cite web | url=https://paleobiodb.org/classic/basicTaxonInfo?taxon_no=151700 | title=PBDB Taxon }}
• {{extinct}}Paraisurus macrorhizus Pictet and Campiche 1858

| synonyms =

{{collapsible list|title=Species synonymy|

{{collapsible list|title=Paraisurus macrorhizus|

• Oxyrhina macrorhiza Pictet & Campiche, 1858}}

{{collapsible list|title=Paraisurus compressus|

• Paraisurus amudarjensis Mertinienė, Nessov, & Nazarkin, 1994{{cite journal |last1=Mertinienė |first1=R. |last2=Nessov |first2=L. |last3=Nazarkin |first3=M. |date=1994 |title=Cretaceous sharks of the genus Paraisurus in Uzbekistan and Lithuania |journal=Geologija |volume=17 |pages=139–143 |url=https://www.researchgate.net/publication/273777244}}

}} }}

| synonyms_ref =

}}

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.{{cite book |last=Cappetta |first=H. |date=2012 |title=Handbook of Paleoichthyology. Volume 3E. Chondrichthyes. Mesozoic and Cenozoic Elasmobranchii: Teeth. |location=Munich |publisher=Verlag Dr. Friedrich Pfeil |isbn=978-3-89937-148-2}} A fifth species, P. amudarjensis, is now considered a synonym of P. compressus.{{cite journal |last=Amalfitano |first=J. |date=2021 |title=Reappraisal of the record of the genus Paraisurus (Chondrichthyes; Lamniformes) from the Lower Cretaceous of northern Italy |journal=Bollettino della Società Paleontologica Italiana |volume=60 |issue=2 |pages=157–167 |doi=10.4435/BSPI.2021.07 |doi-broken-date=20 November 2024 }} While this genus is mostly known from isolated teeth, an associated dentition of P. compressus was found in the Weno Formation of Texas.{{cite book |last1=Welton |first1=B.J. |last2=Farish |first2=R.F. |date=1993 |title=The Collector's Guide to Fossil Sharks and Rays from the Cretaceous of Texas |location=Lewisville, TX |publisher=Before Time |url=http://mmtk.ginras.ru/pdf/Welton,Farish,1993_The%20Collector's%20Guide_Fossil%20Shark.pdf |isbn=0-9638394-0-3 }} It went extinct around the Albian-Cenomanian boundary, as a supposed Coniacian occurrence of "P. sp." is likely a misidentified pseudoscapanorhynchid.{{cite journal |last1=Siversson |first1=M. |last2=Machalski |first2=M. |date=2017 |title=Late late Albian (Early Cretaceous) shark teeth from Annopol, Poland |journal=Alcheringa |volume=41 |issue=4 |pages=433–463 |doi=10.1080/03115518.2017.1282981|bibcode=2017Alch...41..433S |s2cid=133123002 }}