Iago angustidens (9)
(CAPPETTA, 1973)
Synonyms: Triakis angustidens
Original description species: (CAPPETTA, 1973)
Genus: Iago COMPAGNO & SPRINGER, 1971
Family: Triakidae GRAY, 1851
Order: Carcharhiniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Iago carlaluisai (1)
LEDER, 2013
Original description species: LEDER, 2013
Genus: Iago COMPAGNO & SPRINGER, 1971
Family: Triakidae GRAY, 1851
Order: Carcharhiniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Iansan beurleni (7)
(SANTOS, 1968)
Synonyms: Rhinobatos beurleni
Original description species: (SANTOS, 1968)
Genus: Iansan BRITO & SERET, 1996
Family: Rhinobatidae MÜLLER & HENLE, 1838
Order: Rhinopristiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Iberolepis sp. (1)

Genus: Iberolepis MADER, 1986
Subclass: Elasmobranchii
Iberotrygon plagiolophus (1)
KRIWET, NUNN & KLUG, 2009
Original description species: KRIWET, NUNN & KLUG, 2009
Genus: Iberotrygon KRIWET, NUNN & KLUG, 2009
Family: incert. fam.
Order: Sclerorhynchiformes
Superorder: Pristiorajea
Subclass: Elasmobranchii
Igdabatis indicus (7)
PRASAD & CAPPETTA, 1993
Synonyms: Igdabatis cf. indicus
Original description species: PRASAD & CAPPETTA, 1993
Genus: Igdabatis CAPPETTA, 1972
Family: Myliobatidae BONAPARTE, 1838
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Igdabatis sigmodon (5)
CAPPETTA, 1972
Synonyms: Igdabatis cf. sigmodon
Original description species: CAPPETTA, 1972
Genus: Igdabatis CAPPETTA, 1972
Family: Myliobatidae BONAPARTE, 1838
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Ikamauius ensifer (5)
(DAVIS, 1888)
Synonyms: Pristiophorus ensifer, Trygon ensifer
Original description species: (DAVIS, 1888)
Genus: Ikamauius KEYES, 1979
Family: Pristiophoridae BLEEKER, 1859
Order: Pristiophoriformes
Superorder: Squalomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Iniopera richardsoni (2)
ZANGERL & CASE, 1973
Synonyms: Iniopera cf. richardsoni
Original description species: ZANGERL & CASE, 1973
Genus: Iniopera ZANGERL & CASE, 1973
Family: Sibyrhynchidae ZANGERL & CASE, 1973
Order: Iniopterygiformes
Subclass: Holocephali
Iniopteryx rushlaui (4)
ZANGERL & CASE, 1973
Synonyms: Iniopteryx cf. rushlaui
Original description species: ZANGERL & CASE, 1973
Genus: Iniopteryx ZANGERL & CASE, 1973
Family: Iniopterygidae ZANGERL & CASE, 1973
Order: Iniopterygiformes
Subclass: Holocephali
Iniopteryx tedwhitei (1)
ZANGERL & CASE, 1973
Original description species: ZANGERL & CASE, 1973
Genus: Iniopteryx ZANGERL & CASE, 1973
Family: Iniopterygidae ZANGERL & CASE, 1973
Order: Iniopterygiformes
Subclass: Holocephali
Inioxyele whitei (1)
ZANGERL & CASE, 1973
Original description species: ZANGERL & CASE, 1973
Genus: Inioxyele ZANGERL & CASE, 1973
Family: Sibyrhynchidae ZANGERL & CASE, 1973
Order: Iniopterygiformes
Subclass: Holocephali
Isacrodus marthae (1)
IVANOV, NESTELL & NESTELL, 2012
Original description species: IVANOV, NESTELL & NESTELL, 2012
Genus: Isacrodus IVANOV, NESTELL & NESTELL, 2012
Family: Jalodontidae GINTER, HAIRAPETIAN & KLUG, 2002
Order: Phoebodontiformes
Subclass: Elasmobranchii
Isanodus nongbualamphuensis (1)
KHAMHA, CUNY & LAUPRASERT, 2016
Original description species: KHAMHA, CUNY & LAUPRASERT, 2016
Genus: Isanodus CUNY, SUTEETHORN, KAMHA, BUFFETAUT & PHILIPPE, 2006
Family: Lonchidiidae HERMAN, 1977
Superfamily: Hybodontoidea
Order: Hybodontiformes
Cohort: Euselachii
Subclass: Elasmobranchii
Isanodus paladeji (8)
CUNY, SUTEETHORN, KAMHA, BUFFETAUT & PHILIPPE, 2006
Original description species: CUNY, SUTEETHORN, KAMHA, BUFFETAUT & PHILIPPE, 2006
Genus: Isanodus CUNY, SUTEETHORN, KAMHA, BUFFETAUT & PHILIPPE, 2006
Family: Lonchidiidae HERMAN, 1977
Superfamily: Hybodontoidea
Order: Hybodontiformes
Cohort: Euselachii
Subclass: Elasmobranchii
Ischyodus acutus (2)
MEYER, 1859
Synonyms: Ischyodus cf. acutus
Original description species: MEYER, 1859
Genus: Ischyodus EGERTON, 1843
Family: Edaphodontidae OWEN, 1846
Order: Chimaeriformes
Subclass: Holocephali
Ischyodus beaumonti (6)
EGERTON, 1843
Synonyms: Ischyodus cf. beaumonti
Original description species: EGERTON, 1843
Genus: Ischyodus EGERTON, 1843
Family: Edaphodontidae OWEN, 1846
Order: Chimaeriformes
Subclass: Holocephali
Ischyodus bifurcatus (10)
CASE, 1978
Synonyms: Ischyodus aff. bifurcatus, Ischyodus cf. bifurcatus
Original description species: CASE, 1978
Genus: Ischyodus EGERTON, 1843
Family: Edaphodontidae OWEN, 1846
Order: Chimaeriformes
Subclass: Holocephali
Ischyodus curvidens (9)
EGERTON, 1843
Synonyms: Ganodus dentatus, Ganodus neglectus, Ganodus rugulosus
Original description species: EGERTON, 1843
Genus: Ischyodus EGERTON, 1843
Family: Edaphodontidae OWEN, 1846
Order: Chimaeriformes
Subclass: Holocephali
Ischyodus dolloi (17)
LERICHE, 1902
Synonyms: Ischyodus cf. dolloi
Original description species: LERICHE, 1902
Genus: Ischyodus EGERTON, 1843
Family: Edaphodontidae OWEN, 1846
Order: Chimaeriformes
Subclass: Holocephali
Ischyodus egertoni (12)
(EGERTON, 1843)
Synonyms: Chimaera (Ischyodon) egertoni, Ischyodon egertonii, Ischyodus cf. egertoni
Original description species: (EGERTON, 1843)
Genus: Ischyodus EGERTON, 1843
Family: Edaphodontidae OWEN, 1846
Order: Chimaeriformes
Subclass: Holocephali
Ischyodus mortoni (3)
CHAPMAN & PRITCHARD, 1907
Original description species: CHAPMAN & PRITCHARD, 1907
Genus: Ischyodus EGERTON, 1843
Family: Edaphodontidae OWEN, 1846
Order: Chimaeriformes
Subclass: Holocephali
Ischyodus obruchevi (1)
AVERIANOV, 1992
Original description species: AVERIANOV, 1992
Genus: Ischyodus EGERTON, 1843
Family: Edaphodontidae OWEN, 1846
Order: Chimaeriformes
Subclass: Holocephali
Ischyodus planus (2)
NEWTON, 1878
Synonyms: Elasmodus planus
Original description species: NEWTON, 1878
Genus: Ischyodus EGERTON, 1843
Family: Edaphodontidae OWEN, 1846
Order: Chimaeriformes
Subclass: Holocephali
Ischyodus quenstedti (4)
(WAGNER, 1857)
Synonyms: Chimaera (Ischyodon) quenstedti
Original description species: (WAGNER, 1857)
Genus: Ischyodus EGERTON, 1843
Family: Edaphodontidae OWEN, 1846
Order: Chimaeriformes
Subclass: Holocephali
Ischyodus rayhaasi (2)
HOGANSON & ERICKSON, 2005
Original description species: HOGANSON & ERICKSON, 2005
Genus: Ischyodus EGERTON, 1843
Family: Edaphodontidae OWEN, 1846
Order: Chimaeriformes
Subclass: Holocephali
Ischyodus schuebleri (5)
QUENSTEDT, 1858
Synonyms: Chimaera schübleri, Ischyodus cf. schuebleri, Ischyodus schübleri
Original description species: QUENSTEDT, 1858
Genus: Ischyodus EGERTON, 1843
Family: Edaphodontidae OWEN, 1846
Order: Chimaeriformes
Subclass: Holocephali
Ischyodus tessoni (11)
BUCKLAND, 1843
Synonyms: Chimaera (Ganodus) colei, Chimaera (Ischyodon) tessoni, Ganodus oweni, Ischyodon tessonii, Ischyodus colei, Leptacanthus serratus
Original description species: BUCKLAND, 1843
Genus: Ischyodus EGERTON, 1843
Family: Edaphodontidae OWEN, 1846
Order: Chimaeriformes
Subclass: Holocephali
Ischyodus williamsae (4)
CASE, 1991
Original description species: CASE, 1991
Genus: Ischyodus EGERTON, 1843
Family: Edaphodontidae OWEN, 1846
Order: Chimaeriformes
Subclass: Holocephali
Ischyrhiza basinensis (1)
CASE, 1987
Original description species: CASE, 1987
Genus: Ischyrhiza LEIDY, 1856
Family: Sclerorhynchidae CAPPETTA, 1974
Suborder: Sclerorhynchoidei
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Ischyrhiza chilensis (9)
(PHILIPPI, 1887)
Original description species: (PHILIPPI, 1887)
Genus: Ischyrhiza LEIDY, 1856
Family: Sclerorhynchidae CAPPETTA, 1974
Suborder: Sclerorhynchoidei
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Ischyrhiza georgiensis (1)
CASE, SCHWIMMER, BORODIN & LEGGETT, 2001
Original description species: CASE, SCHWIMMER, BORODIN & LEGGETT, 2001
Genus: Ischyrhiza LEIDY, 1856
Family: Sclerorhynchidae CAPPETTA, 1974
Suborder: Sclerorhynchoidei
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Ischyrhiza hartenbergeri (7)
CAPPETTA, 1975
Original description species: CAPPETTA, 1975
Genus: Ischyrhiza LEIDY, 1856
Family: Sclerorhynchidae CAPPETTA, 1974
Suborder: Sclerorhynchoidei
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Ischyrhiza mira (47)
LEIDY, 1856
Synonyms: Ischyrhiza aff. mira, Ischyrhiza antiqua, Ischyrhiza mira mira, Onchosaurus (Ischyrhiza) antiquus
Original description species: LEIDY, 1856
Genus: Ischyrhiza LEIDY, 1856
Family: Sclerorhynchidae CAPPETTA, 1974
Suborder: Sclerorhynchoidei
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Ischyrhiza mira schneideri (1)
SLAUGHTER & STEINER, 1968
Original description species: SLAUGHTER & STEINER, 1968
Genus: Ischyrhiza LEIDY, 1856
Family: Sclerorhynchidae CAPPETTA, 1974
Suborder: Sclerorhynchoidei
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Ischyrhiza monasterica (1)
CASE & CAPPETTA, 1997
Original description species: CASE & CAPPETTA, 1997
Genus: Ischyrhiza LEIDY, 1856
Family: Sclerorhynchidae CAPPETTA, 1974
Suborder: Sclerorhynchoidei
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Ischyrhiza radiata (2)
CLARK, 1895
Original description species: CLARK, 1895
Genus: Ischyrhiza LEIDY, 1856
Family: Sclerorhynchidae CAPPETTA, 1974
Suborder: Sclerorhynchoidei
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Ischyrhiza schneideri (8)
(SLAUGHTER & SCHNEIDER, 1968)
Original description species: (SLAUGHTER & SCHNEIDER, 1968)
Genus: Ischyrhiza LEIDY, 1856
Family: Sclerorhynchidae CAPPETTA, 1974
Suborder: Sclerorhynchoidei
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Ischyrhiza serra (1)
NESSOV, 1997
Original description species: NESSOV, 1997
Genus: Ischyrhiza LEIDY, 1856
Family: Sclerorhynchidae CAPPETTA, 1974
Suborder: Sclerorhynchoidei
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Ischyrhiza viaudi (2)
CAPPETTA, 1981
Original description species: CAPPETTA, 1981
Genus: Ischyrhiza LEIDY, 1856
Family: Sclerorhynchidae CAPPETTA, 1974
Suborder: Sclerorhynchoidei
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Ishaquia globidens (2)
(ARAMBOURG, 1952)
Synonyms: Dasyatis globidens
Original description species: (ARAMBOURG, 1952)
Genus: Ishaquia NOUBHANI & CAPPETTA, 1995
Family: Dasyatidae JORDAN, 1888
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Isistius triangulus (37)
(PROBST, 1879)
Synonyms: Centrina dertonensis, Isistius aff. triangulus, Isistius cf. triangulus, Isistius dertonensis, Scymnorhinus triangulus, Scymnus triangulus
Original description species: (PROBST, 1879)
Genus: Isistius GILL, 1865
Family: Dalatiidae GRAY, 1851
Order: Squaliformes
Superorder: Squalomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Isistius trituratus (36)
(WINKLER, 1876)
Synonyms: Corax trituratus, Isistius aff. trituratus, Isistius cf. trituratus, Scymnus trituratus
Original description species: (WINKLER, 1876)
Genus: Isistius GILL, 1865
Family: Dalatiidae GRAY, 1851
Order: Squaliformes
Superorder: Squalomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Isogomphodon acuarius (21)
(PROBST, 1879)
Synonyms: Alopecias acuarias, Aprionodon acuarias, Aprionodon acuarius, Carcharhinus acuarius, Carcharhinus (Aprionodon) gracilis, Carcharhinus (Aprionodon) lerichei minuta, Isogomphodon gracilis
Original description species: (PROBST, 1879)
Genus: Isogomphodon GILL, 1862
Family: Carcharhinidae JORDAN & EVERMANN, 1896
Order: Carcharhiniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Isogomphodon caunellensis (5)
(CAPPETTA, 1970)
Synonyms: Aprionodon aff. caunellensis, Aprionodon caunellensis, Aprionodon cf. caunellensis
Original description species: (CAPPETTA, 1970)
Genus: Isogomphodon GILL, 1862
Family: Carcharhinidae JORDAN & EVERMANN, 1896
Order: Carcharhiniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Isurolamna affinis (26)
(CASIER, 1946)
Synonyms: Isurolamna hopei affinis, Lamiostoma affinis, Lamna affinis, Odontaspis hopei affinis, Odontaspis (Synodontaspis) hopei affinis
Original description species: (CASIER, 1946)
Genus: Isurolamna CAPPETTA, 1976
Family: Lamnidae MÜLLER & HENLE, 1838
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Isurolamna bajarunasi (4)
(GLIKMAN & ZHELEZKO, 1985)
Synonyms: Lamiostoma bajarunasi
Original description species: (GLIKMAN & ZHELEZKO, 1985)
Genus: Isurolamna CAPPETTA, 1976
Family: Lamnidae MÜLLER & HENLE, 1838
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Isurolamna gracilis (13)
(LE HON, 1871)
Original description species: (LE HON, 1871)
Genus: Isurolamna CAPPETTA, 1976
Family: Lamnidae MÜLLER & HENLE, 1838
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Isurolamna inflata (24)
(LERICHE, 1905)
Synonyms: Isurolamna aff. inflata, Lamna inflata, Lamna vincenti inflata
Original description species: (LERICHE, 1905)
Genus: Isurolamna CAPPETTA, 1976
Family: Lamnidae MÜLLER & HENLE, 1838
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Isurus desori (170)
(AGASSIZ, 1843)
Synonyms: Isurus cf. desori, Isurus desorii, Isurus desorii desorii, Lamiostoma desori, Lamna desori, Lamna inaequilateralis, Lamna lyellii, Oxyrhina aff. desori, Oxyrhina cf. desori, Oxyrhina desori, Oxyrhina desorii
Original description species: (AGASSIZ, 1843)
Genus: Isurus RAFINESQUE, 1810
Family: Lamnidae MÜLLER & HENLE, 1838
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Isurus flandricus (18)
(LERICHE, 1910)
Synonyms: Cosmopolitodus flandricus, Cosmopolitodus (Isurus) flandricus, Isurus aff. desori flandrica, Isurus aff. flandricus, Isurus desori flandrica, Isurus desori flandricus, Isurus desorii aff. flandricus, Isurus desorii flandricus, Isurus gracilis flandrica, Macrorhizodus flandricus, Oxyrhina desori flandrica
Original description species: (LERICHE, 1910)
Genus: Isurus RAFINESQUE, 1810
Family: Lamnidae MÜLLER & HENLE, 1838
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Isurus minutus (14)
(AGASSIZ, 1843)
Synonyms: Lamna aff. minuta, Oxyrhina minuta
Original description species: (AGASSIZ, 1843)
Genus: Isurus RAFINESQUE, 1810
Family: Lamnidae MÜLLER & HENLE, 1838
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Isurus nakaminatoensis (1)
SAITO, 1961
Original description species: SAITO, 1961
Genus: Isurus RAFINESQUE, 1810
Family: Lamnidae MÜLLER & HENLE, 1838
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Isurus planus (18)
(AGASSIZ, 1856)
Synonyms: Oxyrhina plana
Original description species: (AGASSIZ, 1856)
Genus: Isurus RAFINESQUE, 1810
Family: Lamnidae MÜLLER & HENLE, 1838
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Isurus praecursor (66)
(LERICHE, 1905)
Synonyms: Cosmopolitodus praecursor, Cosmopolitodus (Isurus) praecursor, Isurus cf. praecursor, Isurus desori praecursor, Macrorhizodus praecursor, Macrorhizodus (Isurus) precursor, Otodus lawleyi, Oxyrhina desori praecursor, Oxyrhina latus, Oxyrhina praecursor
Original description species: (LERICHE, 1905)
Genus: Isurus RAFINESQUE, 1810
Family: Lamnidae MÜLLER & HENLE, 1838
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Isurus rameshi (2)
MEHROTRA, MISHRA & SRIVASTAVA, 1973
Original description species: MEHROTRA, MISHRA & SRIVASTAVA, 1973
Genus: Isurus RAFINESQUE, 1810
Family: Lamnidae MÜLLER & HENLE, 1838
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Isurus retroflexus (41)
(AGASSIZ, 1838)
Valid name: Anotodus retroflexus
Valid name: Anotodus retroflexus
Original description species: (AGASSIZ, 1838)
Genus: Isurus RAFINESQUE, 1810
Family: Lamnidae MÜLLER & HENLE, 1838
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Itapyrodus punctatus (5)
SILVA SANTOS, 1990
Original description species: SILVA SANTOS, 1990
Genus: Itapyrodus SILVA SANTOS, 1990
Family: Petalodontidae NEWBERRY & WORTHEN, 1866
Order: Petalodontiformes
Subclass: Euchondrocephali
Ivanelepis costulata (1)
KARATAJUTE-TALIMAA, 1997
Original description species: KARATAJUTE-TALIMAA, 1997
Genus: Ivanelepis KARATAJUTE-TALIMAA, 1997
Family: incert. fam.
Order: incert. sedis
Subclass: Elasmobranchii
Ixobatis mucronata (4)
(ARAMBOURG, 1952)
Synonyms: Raja mucronata
Original description species: (ARAMBOURG, 1952)
Genus: Ixobatis NOUBHANI & CAPPETTA, 1995
Family: incert. fam.
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii