Abdobalistum Poyato-Ariza & Wenz, 2002 † (verified source for family)
Abdobalistum Poyato-Ariza & Wenz, 2002 † (current name source)
Abromasta Day, 2003 † (current name source)
Abruzzoichthys Carnevale, 2002 † (current name source)
Achanarraspis Anderson, Dunlop & Trewin, 2000 † (current name source)
Achoania Zhu, Yu & Ahlberg, 2001 † (current name source)
Achoania Zhu, Yu & Ahlberg, 2001 † (verified source for family)
Acritolepidae Valiukevičius & Burrow, 2005 † (taxonomy source)
Acritolepidae Valiukevičius & Burrow, 2005 † (current name source)
Adamisaurus Sulimski, 1972 † (verified source for family)
Adamisaurus Sulimski, 1972 † (current name source)
Adamisaurus Sulimski, 1972 † (extant flag source)
Adelalopus Mayr & Smith, 2002 † (current name source)
Adelargo Johanson & Ritchie, 2000 † (current name source)
Adelargo Johanson & Ritchie, 2000 † (verified source for family)
Adzhosuchus Efimov in Efimov, Gubin & Kurzanov, 2000 † (current name source)
Adzhosuchus Efimov in Efimov, Gubin & Kurzanov, 2000 † (verified source for family)
Aegirosaurus Bardet & Fernandez, 2000 † (verified source for family)
Aegirosaurus Bardet & Fernandez, 2000 † (current name source)
Aelurognathus Haughton, 1924 † (current name source)
Aelurognathus Haughton, 1924 † (verified source for family)
Aesopichthyidae Poplin & Lund, 2000 † (habitat flag source)
Aesopichthyidae Poplin & Lund, 2000 † (current name source)
Aesopichthyidae Poplin & Lund, 2000 † (extant flag source)
Aesopichthyidae Poplin & Lund, 2000 † (basis of record)
Aesopichthyidae Poplin & Lund, 2000 † (taxonomy source)
Aesopichthys Poplin & Lund, 2000 † (verified source for family)
Aesopichthys Poplin & Lund, 2000 † (current name source)
Aethephasma Ren, 1997 † (current name source)
Aethephasma Ren, 1997 † (verified source for family)
Agelasida (current name source)
Agnosphitys Fraser, Padian, Walkden & Davis, 2002 † (current name source)
Agnosphitys Fraser, Padian, Walkden & Davis, 2002 † (verified source for family)
Agustinia Bonaparte, 1999 † (verified source for family)
Agustinia Bonaparte, 1999 † (current name source)
Aiolosaurus Gao & Norell, 2000 † (verified source for family)
Aiolosaurus Gao & Norell, 2000 † (current name source)
Akmonistion Coates & Sequeira, 2001 † (current name source)
Akmonistion Coates & Sequeira, 2001 † (verified source for family)
Aleosteus Johnson, Elliott & Wittke, 2000 † (current name source)
Aleosteus Johnson, Elliott & Wittke, 2000 † (verified source for family)
Aletopelta Ford & Kirkland, 2001 † (verified source for family)
Aletopelta Ford & Kirkland, 2001 † (current name source)
Alligatorellus Gervais, 1871 † (current name source)
Alligatorium Jourdan, 1862 † (current name source)
Alligatorium Jourdan, 1862 † (habitat flag source)
Alligatorium Jourdan, 1862 † (verified source for family)
Alligatorium Jourdan, 1862 † (extant flag source)
Alpinothalamia Senowbari-Daryan, 1990 † (additional source)
Amalitzkia Pravoslavlev, 1927 † accepted as Inostrancevia Amalitzky, 1922 † (source of synonymy)
Amalitzkia Pravoslavlev, 1927 † accepted as Inostrancevia Amalitzky, 1922 † (verified source for family)
Amalitzkia Pravoslavlev, 1927 † accepted as Inostrancevia Amalitzky, 1922 † (extant flag source)
Ameghinichthys Arratia, Scasso & Kiessling, 2004 † (current name source)
Amitabha Gulas-Wroblewski & Wroblewski, 2003 † (verified source for family)
Amitabha Gulas-Wroblewski & Wroblewski, 2003 † (current name source)
Ammonites Bruguière, 1789 † (verified source for family)
Ammonitida † (current name source)
Ammonitida † (name verified source)
Amuremys Danilov, Bolotsky, Averianov & Donchenko, 2002 † (current name source)
Anabisetia Coria & Calvo, 2002 † (verified source for family)
Anabisetia Coria & Calvo, 2002 † (current name source)
Anatosuchus Sereno, Sidor, Larsson & Gado, 2003 † (current name source)
Anatosuchus Sereno, Sidor, Larsson & Gado, 2003 † (verified source for family)
Anaxyela Martynov, 1925 † (extant flag source)
Anaxyela Martynov, 1925 † (current name source)
Angarosphecidae Rasnitsyn, 1975 † (taxonomy source)
Angarosphecidae Rasnitsyn, 1975 † (extant flag source)
Angarosphecidae Rasnitsyn, 1975 † (basis of record)
Angarosphecidae Rasnitsyn, 1975 † (current name source)
Angarosphecidae Rasnitsyn, 1975 † (name verified source)
Angarosphecidae Rasnitsyn, 1975 † (habitat flag source)
Angarosphex Rasnitsyn, 1975 † (verified source for family)
Angarosphex Rasnitsyn, 1975 † (current name source)
Animantarx Carpenter, Kirkland, Burge & Bird, 1999 † (current name source)
Ankylosphenodon Reynoso, 2000 † (current name source)
Ankylosphenodon Reynoso, 2000 † (verified source for family)
Anomalochelys Hirayama, Sakurai, Chitoku, Kawakami & Kito, 2001 † (current name source)
Anomalochelys Hirayama, Sakurai, Chitoku, Kawakami & Kito, 2001 † (verified source for family)
Anomocephalus Modesto, Rubidge & Welman, 1999 † (verified source for family)
Anomocephalus Modesto, Rubidge & Welman, 1999 † (current name source)
Anoualerpeton Gardner, Evans & Sigogneau-Russell, 2003 † (verified source for family)
Anoualerpeton Gardner, Evans & Sigogneau-Russell, 2003 † (current name source)
Antarctithrissops Arratia, Scasso & Kiessling, 2004 † (current name source)
Antetonitrus Yates & Kitching, 2003 † (verified source for family)
Antetonitrus Yates & Kitching, 2003 † (current name source)
Anthocoridae Fieber, 1837 (current name source)
Anthocoridae Fieber, 1837 (name verified source)
Anticostiodus Zhang & Barnes, 2000 † (current name source)
Apricosiren Evans & McGowan, 2002 † (verified source for family)
Apricosiren Evans & McGowan, 2002 † (current name source)
Aprisaurus Alifanov, 2000 † (current name source)
Aprisaurus Alifanov, 2000 † (extant flag source)
Aprisaurus Alifanov, 2000 † (habitat flag source)
Aprisaurus Alifanov, 2000 † (basis of record)
Aprisaurus Alifanov, 2000 † (verified source for family)
Aprisaurus Alifanov, 2000 † (name verified source)
Apsaravis Norell & Clarke, 2001 † (current name source)
Apsaravis Norell & Clarke, 2001 † (verified source for family)
Arambourgthurus Tyler, 2000 † (verified source for family)
Arambourgthurus Tyler, 2000 † (current name source)

 Descriptive info

 for Parvoolithus Mikhailov, 1996 †

Oogenus (fossil egg). [details]

 Descriptive info

 for Porituberoolithus Zelenitsky, Hills & Currie, 1996 †

Oogenus (fossil egg). [details]

 Descriptive info

 for Preprismatoolithus Zelenitsky & Hills, 1996 †

Oogenus (fossil egg). [details]

 Descriptive info

 for Spheruprismatoolithus Bray, 1999 †

Oogenus (fossil egg). [details]

 Descriptive info

 for Spongioolithus Bray, 1999 †

Oogenus (fossil egg). [details]

 Descriptive info

 for Tristraguloolithus Zelenitsky, Hills & Currie, 1996 †

Oogenus (fossil egg). [details]

 Taxonomic remark

 for Actinostromariidae Hudson, 1955 †

Taxonomic placement unclear: The PaleoBiology DB (2023) lists in order Axinellida "according to R. Wood 1987"; West ... [details]

 Taxonomic remark

 for Ammonitida †

Sometimes treated as a suborder (Ammonitina) of order Ammonoidea, the latter treated as a subclass in the ... [details]

 Taxonomic remark

 for Angarosphecidae Rasnitsyn, 1975 †

Sometimes treated as a subfamily (Angarosphecinae) of Sphecidae. [details]

 Taxonomic remark

 for Criocephalus Broom, 1928 †

Junior homonym of Criocephalus Mulsant, 1839 (Coleoptera); replacement name is Criocephalosaurus Kammerer & Sidor, 2002. [details]

 Taxonomic remark

 for Gorgonopidae Lydekker, 1890 †

Also spelled Gorgonopsidae, however Gorgonopidae is correctly formed according to the ICZN Code and is also the ... [details]

 Taxonomic remark

 for Gorgonopsidae Lydekker, 1890 †

This spelling i.e. Gorgonopsidae is used in Benton, 1993 and some other sources, however Gorgonopidae is correctly ... [details]

 Taxonomic remark

 for Guizhouella Liu in Liu, Yin, Wang, Luo & Wang, 2003 †

Junior homonym of Guizhouella Yang, 1978 (Brachiopoda) and Guizhouella Shu, 1990 (Ostracoda); replacement name is ... [details]

 Taxonomic remark

 for Haasia Polcyn, Tchernov & Jacobs, 1999 †

Junior homonym of Haasia Bollman, 1893 (Diplopoda) and Haasia Yuan, 1988 (Trilobita); replacement name is ... [details]

 Taxonomic remark

 for Hagiphasma Ren, 1997 †

Originally as type of a new family, Hagiphasmatidae Ren 1997, the latter now included in Susumaniidae. [details]

 Taxonomic remark

 for Heishanoolithus Zhao & Zhao, 1999 †

Oogenus (fossil egg). [details]

 Taxonomic remark

 for Istiodactylus Howse, Milner & Martill, 2001 †

The Paleobiology Database (2023 version) refers Istiodactylus only to Pterosauria: Ornithocheiroidea, possibly ... [details]

 Taxonomic remark

 for Judithemys Parham & Hutchison, 2003 †

The Paleobiology Database (2023 version) currently lists Judithemys in Sinemydidae, but also in "unranked clade ... [details]

 Taxonomic remark

 for Liaoningopterus Wang & Zhou, 2003 †

The Paleobiology Database (2023 version) has this genus unplaced in Ornithocheiroidea according to B. Andres et al. ... [details]

 Taxonomic remark

 for Megachirella Renesto & Posenato, 2003 †

The Paleobiology Database (2023 version) lists this genus in Eosuchia, but notes that to Simões et al., 2018 place ... [details]

 Taxonomic remark

 for Olivieria Brink, 1965 †

Junior homonym of Olivieria Robineau-Desvoidy, 1830 (Diptera); replacement name is Olivierosuchus Kammerer & Sidor, ... [details]

 Taxonomic remark

 for Palaeopteron Rice, 1969 †

Assigned to Plecoptera in original work. [details]

 Taxonomic remark

 for Paleotestudo de Lapparent de Broin, 2000 †

Authority incorrectly given as Lartet 1851 in The Paleobiology Database (2023 version); correct is Lapparent de ... [details]

 Taxonomic remark

 for Podophis Rage & Escuillie, 2000 †

Junior homonym of Podophis Wiegmann, 1834 (Scincidae); replacement name is Eupodophis Rage & Escuillie, 2002. [details]

 Taxonomic remark

 for Stegocephali †

From PaleoBiology DB: Alternative spellings: Stegocephala, Stegocephalia, Stegocephalia. [details]

 Taxonomic remark

 for Vivaxosaurus Kalandadze & Kurkin, 2000 †

The Paleobiology Database (February 2023) lists Vivaxosaurus as a synonym of Fortunodon Kurkin, 2012, however this ... [details]