Genus: Taeniura Müller & Henle, 1837
Family: Dasyatidae Jordan & Gilbert, 1879
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Dasyatis aff. cavernosa, Dasyatis cavernosa, Dasyatis cavernosus, Raja cavernosa, Taeniura aff. cavernosa, Taeniura cavernosa, Taeniurops cavernosa, Trygon cavernosus
Original description species: (Probst, 1877)
Genus: Taeniurops Garman, 1913
Family: Dasyatidae Jordan & Gilbert, 1879
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Taeniura aff. grabata-f, Taeniura cf. grabata-f
Original description species: (Geoffroy Saint-Hilaire, 1817)
Genus: Taeniurops Garman, 1913
Family: Dasyatidae Jordan & Gilbert, 1879
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Laurito & Valerio, 2021
Genus: Taeniurops Garman, 1913
Family: Dasyatidae Jordan & Gilbert, 1879
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Genus: Taeniurops Garman, 1913
Family: Dasyatidae Jordan & Gilbert, 1879
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Adnet & Charpentier, 2022
Genus: Taeniurops Garman, 1913
Family: Dasyatidae Jordan & Gilbert, 1879
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Andreev, Zhao, Wang, Smith, Li, Cui, Zhu & Sansom, 2020
Genus: Taklamakanolepis Andreev, Zhao, Wang, Smith, Li, Cui, Zhu & Sansom, 2020
Family: Mongolepididae Karatajute-Talimaa & Novitskaya, 1990
Order: Mongolepidida

Original description species: Williams, 1989
Genus: Tamiobatis Eastman, 1897
Family: Ctenacanthidae Dean, 1909
Order: Ctenacanthiformes
Superorder: Cladodontomorphi
Subclass: Elasmobranchii

Original description species: Ivanov, 2018
Genus: Tamiobatis Eastman, 1897
Family: Ctenacanthidae Dean, 1909
Order: Ctenacanthiformes
Superorder: Cladodontomorphi
Subclass: Elasmobranchii

Synonyms: Cladodus exiguus, Cladodus succinctus
Original description species: (St. John & Worthen, 1875)
Genus: Tamiobatis Eastman, 1897
Family: Ctenacanthidae Dean, 1909
Order: Ctenacanthiformes
Superorder: Cladodontomorphi
Subclass: Elasmobranchii

Original description species: Eastman, 1897
Genus: Tamiobatis Eastman, 1897
Family: Ctenacanthidae Dean, 1909
Order: Ctenacanthiformes
Superorder: Cladodontomorphi
Subclass: Elasmobranchii

Synonyms: Cladodus wachsmuthi
Original description species: (St. John & Worthen, 1875)
Genus: Tamiobatis Eastman, 1897
Family: Ctenacanthidae Dean, 1909
Order: Ctenacanthiformes
Superorder: Cladodontomorphi
Subclass: Elasmobranchii

Original description species: St. John & Worthen, 1875
Genus: Tanaodus St. John & Worthen, 1875
Family: Petalodontidae Newberry & Worthen, 1866
Order: Petalodontiformes
Subclass: Euchondrocephali

Synonyms: Tanaodus depressius
Original description species: St. John & Worthen, 1875
Genus: Tanaodus St. John & Worthen, 1875
Family: Petalodontidae Newberry & Worthen, 1866
Order: Petalodontiformes
Subclass: Euchondrocephali

Original description species: St. John & Worthen, 1875
Genus: Tanaodus St. John & Worthen, 1875
Family: Petalodontidae Newberry & Worthen, 1866
Order: Petalodontiformes
Subclass: Euchondrocephali

Synonyms: Chomatodus multiplicatus
Original description species: (Newberry & Worthen, 1866)
Genus: Tanaodus St. John & Worthen, 1875
Family: Petalodontidae Newberry & Worthen, 1866
Order: Petalodontiformes
Subclass: Euchondrocephali

Synonyms: Chomatodus obscurus
Original description species: (Leidy, 1857)
Genus: Tanaodus St. John & Worthen, 1875
Family: Petalodontidae Newberry & Worthen, 1866
Order: Petalodontiformes
Subclass: Euchondrocephali

Original description species: St. John & Worthen, 1875
Genus: Tanaodus St. John & Worthen, 1875
Family: Petalodontidae Newberry & Worthen, 1866
Order: Petalodontiformes
Subclass: Euchondrocephali

Original description species: St. John & Worthen, 1875
Genus: Tanaodus St. John & Worthen, 1875
Family: Petalodontidae Newberry & Worthen, 1866
Order: Petalodontiformes
Subclass: Euchondrocephali

Synonyms: Antliodus scoticus
Original description species: (Moy-Thomas, 1938)
Genus: Tanaodus St. John & Worthen, 1875
Family: Petalodontidae Newberry & Worthen, 1866
Order: Petalodontiformes
Subclass: Euchondrocephali

Original description species: St. John & Worthen, 1875
Genus: Tanaodus St. John & Worthen, 1875
Family: Petalodontidae Newberry & Worthen, 1866
Order: Petalodontiformes
Subclass: Euchondrocephali

Original description species: St. John & Worthen, 1875
Genus: Tanaodus St. John & Worthen, 1875
Family: Petalodontidae Newberry & Worthen, 1866
Order: Petalodontiformes
Subclass: Euchondrocephali

Synonyms: Climaxodus wisei
Original description species: (Woodward, 1920)
Genus: Tanaodus St. John & Worthen, 1875
Family: Petalodontidae Newberry & Worthen, 1866
Order: Petalodontiformes
Subclass: Euchondrocephali

Original description species: Noubhani & Cappetta, 1995
Genus: Tanoutia Noubhani & Cappetta, 1995
Family: incert. fam.
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Sansom, Davies, Coates, Nicoll, & Ritchie, 2012
Genus: Tantalepis Sansom, Davies, Coates, Nicoll & Ritchie, 2012
Family: incert. fam.
Order: incert. sedis

Synonyms: Pleuracanthus albuquerquei, Xenacanthus albuquerquei
Original description species: (Silva Santos, 1946)
Genus: Taquaralodus Chahud & Petri, 2010
Family: Diplodoselachidae Dick, 1981
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Original description species: Min, 1998
Genus: Tarimacanthus Min, 1998
Family: Sinacanthidae Min, 1998
Order: Sinacanthida
Subclass: Elasmobranchii

Original description species: Derycke & Goujet, 2011
Genus: Tassiliodus Derycke & Goujet, 2011
Family: incert. fam.
Order: incert. sedis
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Guinot, Hautier, Sambou & Martin, 2023
Genus: Terangabatis Guinot, Hautier, Sambou & Martin, 2023
Family: Rhinobatidae Bonaparte, 1835
Order: Rhinopristiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Koot, Cuny, Tintori & Twitchett, 2013
Genus: Teresodus Koot, Cuny, Tintori & Twitchett, 2013
Family: incert. fam.
Order: Hybodontiformes
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Karatajute-Talimaa & Novitskaya, 1992
Genus: Teslepis Karatajute-Talimaa & Novitskaya, 1992
Family: Mongolepididae Karatajute-Talimaa & Novitskaya, 1990
Order: Mongolepidida

Original description species: Carvalho, 2004
Genus: Tethybatis De Carvalho, 2004
Family: Rhinobatidae Bonaparte, 1835
Order: Rhinopristiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Cappetta & Case, 2016
Genus: Tethylamna Cappetta & Case, 2016
Family: Odontaspididae Müller & Henle, 1839
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Alexandrinum molinii, Alexandrinum sp., Anacanthus zigni, Anacanthus zignii, Dasyatis molinii, Dasyatis muricata, Dasyatis zigni, Raja muricata, Trygon gazolae, Trygon gazzolae, Trygon muricata, Trygon muricatus, Trygon (Taeniura) muricatus, Trygonobatus vulgaris
Original description species: (Volta, 1796)
Genus: Tethytrygon Marramà, Carnevale, Naylor & Kriwet, 2018
Family: Dasyatidae Jordan & Gilbert, 1879
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Case & Cappetta, 1997
Genus: Texabatis Case & Cappetta, 1997
Family: incert. fam.
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Genus: Texasodus Ivanov, Nestell & Nestell, 2012
Family: Jalodontidae Ginter, Hairapetian & Klug, 2002
Order: Jalodontiformes
Subclass: Elasmobranchii

Original description species: Ivanov, Nestell & Nestell, 2012
Genus: Texasodus Ivanov, Nestell & Nestell, 2012
Family: Jalodontidae Ginter, Hairapetian & Klug, 2002
Order: Jalodontiformes
Subclass: Elasmobranchii

Synonyms: Erguitaia benningensis, Ptychotrygon benningensis
Original description species: (Case, Schwimmer, Borodin & Leggett, 2001)
Genus: Texatrygon Cappetta & Case, 1999
Family: incert. fam.
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Kirkland, Eaton & Brinkman, 2013
Genus: Texatrygon Cappetta & Case, 1999
Family: incert. fam.
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Texatrygon cf. copei
Original description species: Cappetta & Case, 1999
Genus: Texatrygon Cappetta & Case, 1999
Family: incert. fam.
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Ptychotrygon hooveri, Ptychotrygon rubyae, Texatrygon rubyae
Original description species: (Mcnulty & Slaughter, 1972)
Genus: Texatrygon Cappetta & Case, 1999
Family: incert. fam.
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Bourdon, Wright, Lucas, Spielmann & Pence, 2011
Genus: Texatrygon Cappetta & Case, 1999
Family: incert. fam.
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Andreev, Coates, Shelton, Cooper, Smith & Sansom, 2015
Genus: Tezakia Andreev, Coates, Shelton, Cooper, Smith & Sansom, 2015
Family: Tezakidae Andreev, Coates, Shelton, Cooper, Smith & Sansom, 2015
Order: Altholepidiformes

Original description species: Cappetta, Buffetaut & Suteethorn, 1990
Genus: Thaiodus Cappetta, Buffetaut & Suteethorn, 1990
Family: Thaiodontidae Cuny, Suteethorn, Kamha & Buffetaut, 2008
Superfamily: Hybodontoidea
Order: Hybodontiformes
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Guinot, Cappetta & Adnet, 2014
Genus: Thiesus Guinot, Cappetta & Adnet, 2014
Family: Scyliorhinidae Gill, 1862
Order: Carcharhiniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Lehman, 1952
Genus: Thoralodus Lehmann, 1952
Subclass: Holocephali

Original description species: Ginter & Sun, 2007
Genus: Thrinacodus St. John & Worthen, 1875
Family: Phoebodontidae Williams In Zangerl 1981
Order: Phoebodontiformes
Subclass: Elasmobranchii

Synonyms: Diplodus duplicatus
Original description species: (Newberry & Worthen, 1866)
Genus: Thrinacodus St. John & Worthen, 1875
Family: Phoebodontidae Williams In Zangerl 1981
Order: Phoebodontiformes
Subclass: Elasmobranchii

Synonyms: Thrinacodus cf. dziki
Original description species: Ginter, Duffin, Dean & Korn, 2014
Genus: Thrinacodus St. John & Worthen, 1875
Family: Phoebodontidae Williams In Zangerl 1981
Order: Phoebodontiformes
Subclass: Elasmobranchii

Original description species: (Turner, 1982)
Genus: Thrinacodus St. John & Worthen, 1875
Family: Phoebodontidae Williams In Zangerl 1981
Order: Phoebodontiformes
Subclass: Elasmobranchii

Synonyms: Thrinacodus cf. gracia, Thrinacoselache gracia
Original description species: (Grogan & Lund, 2008)
Genus: Thrinacodus St. John & Worthen, 1875
Family: Phoebodontidae Williams In Zangerl 1981
Order: Phoebodontiformes
Subclass: Elasmobranchii

Synonyms: Diplodus incurvus, Thrinacodus cf. ferox, Thrinacodus cf. incurvus
Original description species: (Newberry & Worthen, 1866)
Genus: Thrinacodus St. John & Worthen, 1875
Family: Phoebodontidae Williams In Zangerl 1981
Order: Phoebodontiformes
Subclass: Elasmobranchii

Original description species: St. John & Worthen, 1875
Genus: Thrinacodus St. John & Worthen, 1875
Family: Phoebodontidae Williams In Zangerl 1981
Order: Phoebodontiformes
Subclass: Elasmobranchii

Synonyms: Thrinacodus cf. tranquillus
Original description species: Ginter, 2000
Genus: Thrinacodus St. John & Worthen, 1875
Family: Phoebodontidae Williams In Zangerl 1981
Order: Phoebodontiformes
Subclass: Elasmobranchii

Synonyms: Harpago ferox, Harpagodens ferox
Original description species: (Turner, 1982)
Genus: Thrinacodus (Harpagodens) St. John & Worthen, 1875
Family: Phoebodontidae Williams In Zangerl 1981
Order: Phoebodontiformes
Subclass: Elasmobranchii

Original description species: Richter, 2007
Genus: Tiaraju Richter, 2005
Family: incert. fam.
Superfamily: Caseodontoidae
Order: Eugeneodontiformes
Subclass: Euchondrocephali

Original description species: Andreev, Zhao, Wang, Smith, Li, Cui, Zhu & Sansom, 2020
Genus: Tielikewatielepis Andreev, Zhao, Wang, Smith, Li, Cui, Zhu & Sansom, 2020
Family: Shiqianolepidae Sansom, Aldridge & Smith, 2000
Order: Mongolepidida

Original description species: Bhat, Ray & Datta, 2018
Genus: Tikiodontus Bhat, Ray & Datta, 2018
Family: incert. fam.
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Original description species: Cappetta, 1993
Genus: Tingaleus Cappetta, 1993
Family: Carcharhinidae Jordan & Evermann, 1896
Order: Carcharhiniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Claeson, Underwood & Ward, 2013
Genus: Tingitanius Claeson, Underwood & Ward, 2013
Family: Trygonorrhinidae Last, Séret & Naylor, 2016
Order: Rhinopristiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Marrama, Claeson, Carnevale & Kriwet, 2017
Genus: Titanonarke De Carvalho, 2010
Family: Narcinidae Gill, 1862
Order: Torpediniformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Narcine molini
Original description species: (Jaekel, 1894)
Genus: Titanonarke De Carvalho, 2010
Family: Narcinidae Gill, 1862
Order: Torpediniformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Brito, Villalobos-Segurab & Alvarado-Ortega, 2019
Genus: Tlalocbatos Brito, Villalobos-Segurab & Alvarado-Ortega, 2019
Family: incert. fam.
Order: Rhinopristiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Borealotodus levinae
Original description species: Zhelezko in Zhelezko & Kozlov, 1999
Genus: Tobolamna Zhelezko In Zhelezko & Kozlov, 1999
Family: Odontaspididae Müller & Henle, 1839
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Borealotodus tobolensis
Original description species: Zhelezko in Zhelezko & Kozlov, 1999
Genus: Tobolamna Zhelezko In Zhelezko & Kozlov, 1999
Family: Odontaspididae Müller & Henle, 1839
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Ewingia cf. problematica, Ewingia problematica
Original description species: (Case & Cappetta, 1997)
Genus: Tomewingia Case & Cappetta, 2013
Family: incert. fam.
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Torpedo aff. acarinata
Original description species: Adnet, 2006
Genus: Torpedo Dumeril, 1805
Family: Torpedinidae Bonaparte, 1838
Order: Torpediniformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Reinecke, 2015
Genus: Torpedo Dumeril, 1805
Family: Torpedinidae Bonaparte, 1838
Order: Torpediniformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Smith, 1999
Genus: Torpedo Dumeril, 1805
Family: Torpedinidae Bonaparte, 1838
Order: Torpediniformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Adnet, 2006
Genus: Torpedo Dumeril, 1805
Family: Torpedinidae Bonaparte, 1838
Order: Torpediniformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Genus: Torpedo Dumeril, 1805
Family: Torpedinidae Bonaparte, 1838
Order: Torpediniformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Edestus lecontei
Original description species: (Dean, 1897)
Genus: Toxoprion Hay, 1909
Family: Helicoprionidae Karpinsky, 1911
Order: Eugeneodontiformes
Subclass: Euchondrocephali

Original description species: Lund & Grogan, 1997
Genus: Traquairius Lund & Grogan, 1997
Family: Traquairiidae Lund & Grogan, 1997
Superorder: Holocephalimorpha
Subclass: Holocephali

Original description species: Lund & Grogan, 1997
Genus: Traquairius Lund & Grogan, 1997
Family: Traquairiidae Lund & Grogan, 1997
Superorder: Holocephalimorpha
Subclass: Holocephali

Original description species: Lund & Grogan, 1997
Genus: Traquairius Lund & Grogan, 1997
Family: Traquairiidae Lund & Grogan, 1997
Superorder: Holocephalimorpha
Subclass: Holocephali

Synonyms: Triaenodon cf. obesus-f
Original description species: (Rüppell, 1837)
Genus: Triaenodon Müller & Henle, 1837
Family: Carcharhinidae Jordan & Evermann, 1896
Order: Carcharhiniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Herman & Van Den Eeckhaut, 2010
Genus: Triaenodon Müller & Henle, 1837
Family: Carcharhinidae Jordan & Evermann, 1896
Order: Carcharhiniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Noubhani & Cappetta, 1997
Genus: Triakis Müller & Henle, 1838
Family: Triakidae Gray, 1851
Order: Carcharhiniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Jordan & Gilbert, 1919
Genus: Triakis Müller & Henle, 1838
Family: Triakidae Gray, 1851
Order: Carcharhiniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Scyliorhinus aff. cabindensis, Scyliorhinus cabindensis, Scyllium cabindense
Original description species: (Leriche, 1927)
Genus: Triakis Müller & Henle, 1838
Family: Triakidae Gray, 1851
Order: Carcharhiniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Adnet, 2006
Genus: Triakis Müller & Henle, 1838
Family: Triakidae Gray, 1851
Order: Carcharhiniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Hovestadt & Hovestadt-Euler, 2002
Genus: Triakis Müller & Henle, 1838
Family: Triakidae Gray, 1851
Order: Carcharhiniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Leder, 2013
Genus: Triakis Müller & Henle, 1838
Family: Triakidae Gray, 1851
Order: Carcharhiniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Casier, 1958
Genus: Triakis Müller & Henle, 1838
Family: Triakidae Gray, 1851
Order: Carcharhiniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Triakis cf. semifasciata-f
Original description species: Girard, 1855
Genus: Triakis Müller & Henle, 1838
Family: Triakidae Gray, 1851
Order: Carcharhiniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Triacis sp-f
Genus: Triakis Müller & Henle, 1838
Family: Triakidae Gray, 1851
Order: Carcharhiniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Noubhani & Cappetta, 1997
Genus: Triakis Müller & Henle, 1838
Family: Triakidae Gray, 1851
Order: Carcharhiniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Triakis aff. wardi, Triakis cf. wardi
Original description species: Cappetta, 1976
Genus: Triakis Müller & Henle, 1838
Family: Triakidae Gray, 1851
Order: Carcharhiniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Tribodus cf. limae
Original description species: Brito & Ferreira, 1989
Genus: Tribodus Brito & Ferreira, 1989
Family: Hybodontidae Owen, 1846
Superfamily: Hybodontoidea
Order: Hybodontiformes
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Protohypolophites morlati
Original description species: (Landemaine, 1991)
Genus: Tribodus Brito & Ferreira, 1989
Family: Hybodontidae Owen, 1846
Superfamily: Hybodontoidea
Order: Hybodontiformes
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Cuny, Ouaja, Srarfi, Schmitz, Buffetaut & Benton, 2004
Genus: Tribodus Brito & Ferreira, 1989
Family: Hybodontidae Owen, 1846
Superfamily: Hybodontoidea
Order: Hybodontiformes
Cohort: Euselachii
Subclass: Elasmobranchii

Genus: Trigonognathus Mochizuki & Ohe, 1990
Family: Etmopteridae Fowler, 1934
Order: Squaliformes
Superorder: Squalomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Cappetta & Adnet, 2001
Genus: Trigonognathus Mochizuki & Ohe, 1990
Family: Etmopteridae Fowler, 1934
Order: Squaliformes
Superorder: Squalomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Kozlov, 2001
Genus: Trigonotodus Kozlov In Zhelezko & Kozlov, 1999
Family: Cretoxyrhinidae Glickman, 1958
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Trigonotodus cf. tusbairicus, Trigonotodus tusbaericus
Original description species: Kozlov in Zhelezko & Kozlov, 1999
Genus: Trigonotodus Kozlov In Zhelezko & Kozlov, 1999
Family: Cretoxyrhinidae Glickman, 1958
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Luccisano, Pradel, Amiot, Gand, Steyer & Cuny, 2021
Genus: Triodus Jordan, 1849
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Synonyms: Bohemiacanthus carinatus, Pleuracanthus carinatus, Triodus cf. carinatus, Xenacanthus carinatus
Original description species: (Fritsch, 1890)
Genus: Triodus Jordan, 1849
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Original description species: Johnson & Thayer, 2010
Genus: Triodus Jordan, 1849
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Original description species: Hampe, 1989
Genus: Triodus Jordan, 1849
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Original description species: Hampe, 1989
Genus: Triodus Jordan, 1849
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Original description species: Hampe, 1989
Genus: Triodus Jordan, 1849
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Synonyms: Triodus aff. palatinus, Triodus cf. palatinus
Original description species: Hampe, 1989
Genus: Triodus Jordan, 1849
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Synonyms: Pleuracanthus pulchellus
Original description species: (Davis, 1880)
Genus: Triodus Jordan, 1849
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Original description species: Pauliv, Martinelli, Francischini, Dentzien-Dias, Soares, Schultz & Ribeiro, 2017
Genus: Triodus Jordan, 1849
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Synonyms: Pleuracanthus serratus, Xenacanthus serratus
Original description species: (Davis, 1892)
Genus: Triodus Jordan, 1849
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Synonyms: Pleuracanthus sessilis, Triodus cf. sessilis, Xenacanthus sessilis
Original description species: Jordan, 1849
Genus: Triodus Jordan, 1849
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Original description species: Hampe & Ivanov, 2007
Genus: Triodus Jordan, 1849
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Original description species: Agassiz, 1837
Genus: Tristichius Agassiz, 1837
Family: Hybodontidae Owen, 1846
Superfamily: Hybodontoidea
Order: Hybodontiformes
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Ptychacanthus sublaevis
Original description species: Agassiz, 1837
Genus: Tristychius Agassiz, 1837
Family: Tristychiidae Moy-Thomas, 1936
Superfamily: Hybodontoidea
Order: Hybodontiformes
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Portlock, 1843
Genus: Tristychius Agassiz, 1837
Family: Tristychiidae Moy-Thomas, 1936
Superfamily: Hybodontoidea
Order: Hybodontiformes
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Euphyacanthus semistriatus
Original description species: (Traquair, 1894)
Genus: Tristychius Agassiz, 1837
Family: Tristychiidae Moy-Thomas, 1936
Superfamily: Hybodontoidea
Order: Hybodontiformes
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Hodnett, Toomey, Egli, Ward, Wood, Olson, Tolleson, Tweet & Santucci, 2024
Genus: Troglocladodus Hodnett, Toomey, Egli, Ward, Wood, Olson, Tolleson, Tweet & Santucci, 2024
Family: Ctenacanthidae Dean, 1909
Order: Ctenacanthiformes
Superorder: Cladodontomorphi
Subclass: Elasmobranchii

Original description species: Bernárdez, 2018
Genus: Truyolsodontos Bernárdez, 2018
Family: Truyolsodontidae Bernárdez, 2018
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Genus: Trygonorhina Müller & Henle, 1838
Family: Trygonorrhinidae Last, Séret & Naylor, 2016
Order: Rhinopristiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Lebedev, 1995
Genus: Tuberospina Lebedev, 1995
Family: incert. fam.
Order: incert. sedis
Subclass: Elasmobranchii

Original description species: Fritsch, 1889
Genus: Tubulacanthus Fritisch, 1889
Family: incert. fam.
Order: incert. sedis
Subclass: Elasmobranchii

Original description species: Kozlov, 2001
Genus: Turania Kozlov, 2001
Family: Odontaspididae Müller & Henle, 1839
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Štamberg, 2001
Genus: Turnovichthys Štamberg, 2001
Superfamily: Ctenacanthoidea
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Germanobatos ornatus, Turoniabatis ornatus
Original description species: Landemaine, 1991
Genus: Turoniabatis Landemaine, 1991
Family: incert. fam.
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Zigaite & Karatajute-Talimaa, 2008
Genus: Tuvalepis Zigaite & Karatajute-Talimaa, 2008
Family: incert. fam.
Order: incert. sedis
Subclass: Elasmobranchii