Xampylodon dentatus (23)
(Woodward, 1886)
Synonyms: Notidanodon cf. dentatus, Notidanodon dentatus, Notidanus dentatus, Notorynchus dentatus
Original description species: (Woodward, 1886)
Genus: Xampylodon Cappetta, Morrison & Adnet, 2019
Family: Hexanchidae Gray, 1851
Suborder: Hexanchoidei
Order: Hexanchiformes
Superorder: Squalomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Xenacanthus decheni (30)
(Goldfuss, 1847)
Synonyms: Orthacanthus dechenii, Pleuracanthus decheni, Pleuracanthus (Xenacanthus) decheni
Original description species: (Goldfuss, 1847)
Genus: Xenacanthus Beyrich, 1848
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii
Xenacanthus elegans (4)
(Traquair, 1881)
Synonyms: Pleuracanthus elegans
Original description species: (Traquair, 1881)
Genus: Xenacanthus Beyrich, 1848
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii
Xenacanthus gaudryi (2)
(Brongniart & Sauvage, 1888)
Synonyms: Pleuracanthus gaudryi
Original description species: (Brongniart & Sauvage, 1888)
Genus: Xenacanthus Beyrich, 1848
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii
Xenacanthus humbergensis (5)
Hampe, 1994
Original description species: Hampe, 1994
Genus: Xenacanthus Beyrich, 1848
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii
Xenacanthus laevissimus (15)
(Agassiz, 1837)
Synonyms: Compsacanthus major, Dittodus divergens, Expleuracanthus laevissimus, Pleuracanthus erectus, Pleuracanthus laevissimus, Pleuracanthus planus, Pleuracanthus woodwardi, Pleuracanthus (Diplodus) laevissimus, Pternodus productus
Original description species: (Agassiz, 1837)
Genus: Xenacanthus Beyrich, 1848
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii
Xenacanthus latus (5)
(Newberry & Worthen, 1866)
Synonyms: Diplodus latus, Orthacanthus cf. latus
Original description species: (Newberry & Worthen, 1866)
Genus: Xenacanthus Beyrich, 1848
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii
Xenacanthus meisenheimensis (10)
Hampe, 1994
Original description species: Hampe, 1994
Genus: Xenacanthus Beyrich, 1848
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii
Xenacanthus oelbergensis (2)
(Fritsch, 1890)
Original description species: (Fritsch, 1890)
Genus: Xenacanthus Beyrich, 1848
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii
Xenacanthus ossiani (2)
Johnson, 1999
Synonyms: Xenacanthus cf. ossiani
Original description species: Johnson, 1999
Genus: Xenacanthus Beyrich, 1848
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii
Xenacanthus ovalis (8)
(Fritsch, 1890)
Synonyms: Pleuracanthus ovalis
Original description species: (Fritsch, 1890)
Genus: Xenacanthus Beyrich, 1848
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii
Xenacanthus parallelus (12)
(Fritsch, 1890)
Synonyms: Pleuracanthus parallelus, Xenacanthus paralellus
Original description species: (Fritsch, 1890)
Genus: Xenacanthus Beyrich, 1848
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii
Xenacanthus pricei (1)
Würdig-Maciel, 1975
Original description species: Würdig-Maciel, 1975
Genus: Xenacanthus Beyrich, 1848
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii
Xenacanthus ragonhai (1)
Pauliv, Dias, Sedor & Ribeiro, 2014
Original description species: Pauliv, Dias, Sedor & Ribeiro, 2014
Genus: Xenacanthus Beyrich, 1848
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii
Xenacanthus remigiusbergensis (6)
Hampe, 1994
Original description species: Hampe, 1994
Genus: Xenacanthus Beyrich, 1848
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii
Xenacanthus santosi (1)
Würdig-Maciel, 1975
Original description species: Würdig-Maciel, 1975
Genus: Xenacanthus Beyrich, 1848
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii
Xenacanthus slaughteri (2)
Johnson, 1999
Original description species: Johnson, 1999
Genus: Xenacanthus Beyrich, 1848
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii
Xenacanthus tenuis (3)
(Woodward, 1889)
Synonyms: Diplodus tenuis
Original description species: (Woodward, 1889)
Genus: Xenacanthus Beyrich, 1848
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii
Xenacanthus tocantinsensis (2)
Santos & Salgado, 1970
Original description species: Santos & Salgado, 1970
Genus: Xenacanthus Beyrich, 1848
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii
Xenacanthus tridentatus (4)
(Harlton, 1933)
Synonyms: Bransonella tridentata
Original description species: (Harlton, 1933)
Genus: Xenacanthus Beyrich, 1848
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii
Xenosynechodus egloni (7)
Glikman, 1980
Original description species: Glikman, 1980
Genus: Xenosynechodus Glikman, 1980
Family: Xenosynechodontidae Glickman, 1980
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii
Xiaohaizilepis liui (1)
Andreev, Zhao, Wang, Smith, Li, Cui, Zhu & Sansom, 2020
Original description species: Andreev, Zhao, Wang, Smith, Li, Cui, Zhu & Sansom, 2020
Genus: Xiaohaizilepis Andreev, Zhao, Wang, Smith, Li, Cui, Zhu & Sansom, 2020
Family: Shiqianolepidae Sansom, Aldridge & Smith, 2000
Order: Mongolepidida
Xinjiangichthys pluridentatus (4)
Wang, Zhang, Wang & Zhu, 1998
Original description species: Wang, Zhang, Wang & Zhu, 1998
Genus: Xinjiangichthys Wang, Zhang, Wang & Zhu, 1998
Family: Shiqianolepidae Sansom, Aldridge & Smith, 2000
Order: Mongolepidida
Xinjiangichthys tarimensis (1)
Wang, Zhang, Wang & Zhu, 1998
Original description species: Wang, Zhang, Wang & Zhu, 1998
Genus: Xinjiangichthys Wang, Zhang, Wang & Zhu, 1998
Family: Shiqianolepidae Sansom, Aldridge & Smith, 2000
Order: Mongolepidida
Xiphodolamia barbadica (3)
(Casier, 1958)
Synonyms: Xenodolamia barbadica
Original description species: (Casier, 1958)
Genus: Xiphodolamia Leidy, 1877
Family: Lamnidae Bonaparte, 1835
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Xiphodolamia ensis (23)
Leidy, 1877
Synonyms: Xyphodolamia ensis
Original description species: Leidy, 1877
Genus: Xiphodolamia Leidy, 1877
Family: Lamnidae Bonaparte, 1835
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Xiphodolamia eocaena (34)
(Woodward, 1889)
Synonyms: Carcharias (Scoliodon) eocaenus, Isurus eocaenus, Oxyrhina eocaena, Oxyrhina zignoi, Rhizoprionodon eocaenus, Xenodolamia eocaena, Xiphodolamia eocenica, Xiphodolamia zignoi
Original description species: (Woodward, 1889)
Genus: Xiphodolamia Leidy, 1877
Family: Lamnidae Bonaparte, 1835
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Xiphodolamia serrata (4)
Adnet & Hosseinzadeh & Antunes & Balbino & Kozlov & Cappetta, 2009
Original description species: Adnet & Hosseinzadeh & Antunes & Balbino & Kozlov & Cappetta, 2009
Genus: Xiphodolamia Leidy, 1877
Family: Lamnidae Bonaparte, 1835
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii
Xystracanthus arcuatus (1)
Leidy, 1859
Original description species: Leidy, 1859
Genus: Xystracanthus Leidy, 1859
Subclass: Elasmobranchii
Xystrogaleus cappettai (4)
Adnet, 2006
Original description species: Adnet, 2006
Genus: Xystrogaleus Adnet, 2006
Family: Triakidae Gray, 1851
Order: Carcharhiniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii