Original description species: Werner, 1989
Genus: Baharipristis Werner, 1989
Family: Sclerorhynchidae Cappetta, 1974
Suborder: Sclerorhynchoidei
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Steinbachodus bartheli
Original description species: (Werner, 1989)
Genus: Bahariyodon Duffin, 2001
Family: Lonchidiidae Herman, 1977
Superfamily: Hybodontoidea
Order: Hybodontiformes
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Steinbachodus bartheli
Original description species: (Werner, 1989)
Genus: Bahariyodon (Lissodus)
Family: Polyacrodontidae Glickman, 1964
Superfamily: Hybodontoidea
Order: Hybodontiformes
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Nessov in Nessov & Udovitshenko, 1986
Genus: Baibishia Nessov In Nessov & Udovitshenko, 1986
Family: Rhinobatidae Bonaparte, 1835
Order: Rhinopristiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Bandringa rayi
Original description species: Zangerl, 1979
Genus: Bandringa Zangerl, 1969
Family: Bandringidae Zangerl, 1969
Superfamily: Ctenacanthoidea
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Bandringa herdinae
Original description species: Zangerl, 1969
Genus: Bandringa Zangerl, 1969
Family: Bandringidae Zangerl, 1969
Superfamily: Ctenacanthoidea
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Barbclabornia luedersensis
Original description species: (Berman, 1970)
Genus: Barbclabornia Johnson, 2003
Family: incert. fam.
Order: Bransonelliformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Synonyms: Barbclabornia cf. luederensis, Xenacanthus luedersensis
Original description species: (Berman, 1970)
Genus: Barbclabornia Johnson, 2003
Family: incert. fam.
Order: Bransonelliformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Original description species: St. John & Worthen, 1875
Genus: Batacanthus St. John & Worthen, 1875
Family: incert. fam.
Order: Ichthyodorulites

Original description species: Branson, 1916
Genus: Batacanthus St. John & Worthen, 1875
Family: incert. fam.
Order: Ichthyodorulites

Genus: Batacanthus St. John & Worthen, 1875
Family: incert. fam.
Order: Ichthyodorulites

Original description species: Newberry & Worthen,
Genus: Batacanthus St. John & Worthen, 1875
Family: incert. fam.
Order: Ichthyodorulites

Valid name: Myliobatis biserratus
Original description species: Probst, 1877 (nomen dubium)
Genus: Bates Probst, 1877
Family: incert. fam.
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Myliobatis fluitans
Original description species: Probst, 1877 (nomen dubium)
Genus: Bates Probst, 1877
Family: incert. fam.
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Myliobatis lineatus
Original description species: Probst, 1877 (nomen dubium)
Genus: Bates Probst, 1877
Family: incert. fam.
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Myliobatis spectabilis
Original description species: Probst, 1877 (nomen dubium)
Genus: Bates Probst, 1877
Family: incert. fam.
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Duffin, 1995
Genus: Bathytheristes Duffin, 1995
Family: Callorhinchidae Garman, 1901
Order: Chimaeriformes
Subclass: Holocephali

Synonyms: Dasyatis aff. centroura-f, Dasyatis centroura-f, Dasyatis cf. centroura-f, Dasyatis gr. centroura-f, Trygon gesneri-f, Trygon thalassia fossilis, Trygon thalassia-f
Original description species: (Mitchill, 1815)
Genus: Bathytoshia Whitley, 1933
Family: Dasyatidae Jordan & Gilbert, 1879
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Dasyatis aff. probsti, Dasyatis cf. probsti, Dasyatis probsti
Original description species: (Cappetta, 1970)
Genus: Bathytoshia Whitley, 1933
Family: Dasyatidae Jordan & Gilbert, 1879
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Thies, 2005
Genus: Bavariscyllium Thies, 2005
Family: Scyliorhinidae Gill, 1862
Order: Carcharhiniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Quenstedt, 1882
Genus: Bdellodus Quenstedt, 1882
Family: Acrodontidae Casier, 1959
Superfamily: Hybodontoidea
Order: Hybodontiformes
Cohort: Euselachii
Subclass: Elasmobranchii

Genus: Bdellodus Quenstedt, 1882
Family: Acrodontidae Casier, 1959
Superfamily: Hybodontoidea
Order: Hybodontiformes
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Lund & Grogan, 2004
Genus: Bealbonn Lund & Grogan, 2004
Family: Gregoriidae Lund & Grogan, 2004
Subclass: Euchondrocephali

Original description species: Lund, 1989
Genus: Belantsea Lund, 1989
Family: Belantseidae Lund, 1989
Order: Petalodontiformes
Subclass: Euchondrocephali

Genus: Belantsea Lund, 1989
Family: Belantseidae Lund, 1989
Order: Petalodontiformes
Subclass: Euchondrocephali

Genus: Belantsea Lund, 1989
Family: Belantseidae Lund, 1989
Order: Petalodontiformes
Subclass: Euchondrocephali

Valid name: Belemnobatis sismondae
Original description species: Thiollière, 1852
Genus: Belemnobatis Thiollière, 1852
Family: Spathobatidae Dames, 1888
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Belemnobatis variabilis
Original description species: Underwood & Rees, 2002
Genus: Belemnobatis Thiollière, 1852
Family: Spathobatidae Dames, 1888
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Protospinax annectans
Original description species: (Woodward, 1919)
Genus: Belemnobatis Thiollière, 1852
Family: Spathobatidae Dames, 1888
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Cuny, Srisuk, Khamha, Suteethorn & Tong, 2009
Genus: Belemnobatis Thiollière, 1852
Family: Spathobatidae Dames, 1888
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Belemnobatis moorbergensis
Original description species: (Thies, 1982)
Genus: Belemnobatis Thiollière, 1852
Family: Spathobatidae Dames, 1888
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Belemnobatis picteti
Original description species: (Cappetta, 1975)
Genus: Belemnobatis Thiollière, 1852
Family: Spathobatidae Dames, 1888
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Underwood & Ward, 2004
Genus: Belemnobatis Thiollière, 1852
Family: Spathobatidae Dames, 1888
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Belemnobatis cf. moorbergensis, Spathobatis moorbergensis
Original description species: (Thies, 1982)
Genus: Belemnobatis Thiollière, 1852
Family: Spathobatidae Dames, 1888
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: (Sauvage 1873)
Genus: Belemnobatis Thiollière, 1852
Family: Spathobatidae Dames, 1888
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Delsate & Candoni, 2001
Genus: Belemnobatis Thiollière, 1852
Family: Spathobatidae Dames, 1888
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Belemnobatis cf. picteti, Rhinobatos picteti
Original description species: (Cappetta, 1975)
Genus: Belemnobatis Thiollière, 1852
Family: Spathobatidae Dames, 1888
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Belemnobatis aff. sismondae
Original description species: Thiollière, 1852
Genus: Belemnobatis Thiollière, 1852
Family: Spathobatidae Dames, 1888
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Genus: Belemnobatis Thiollière, 1852
Family: Spathobatidae Dames, 1888
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Underwood & Ward, 2004
Genus: Belemnobatis Thiollière, 1852
Family: Spathobatidae Dames, 1888
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Belemnobatis aff. variabilis
Original description species: Underwood & Rees, 2002
Genus: Belemnobatis Thiollière, 1852
Family: Spathobatidae Dames, 1888
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Spathobatis werneri
Original description species: (Thies, 1982)
Genus: Belemnobatis Thiollière, 1852
Family: Spathobatidae Dames, 1888
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Dasyatis cf. thierryi, Dasyatis thierryi
Original description species: (Smith, 1999)
Genus: Belgabatis Reinecke, Mollen, Gijsen, D’Haeze & Hoedemakers, 2024
Family: incert. fam.
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Chimaera bogolubovi
Original description species: (Nessov, 1986)
Genus: Belgorodon Nessov & Averianov, 1996
Family: Chimaeridae Bonaparte, 1831
Order: Chimaeriformes
Subclass: Holocephali

Genus: Belgorodon Nessov & Averianov, 1996
Family: Chimaeridae Bonaparte, 1831
Order: Chimaeriformes
Subclass: Holocephali

Genus: Benthobatis Alcock, 1898
Family: Narcinidae Gill, 1862
Order: Torpediniformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Zangerl, 1990
Genus: Bethacanthus Zangerl, 1990
Family: Stethacanthidae Lund, 1974
Order: Symmoriiformes
Superorder: Cladodontomorphi
Subclass: Holocephali

Valid name: Triodus sp.
Original description species: Heyler & Poplin, 1982
Genus: Bibractopiscis Heyler & Poplin, 1982
Order: Cladodontida
Subclass: Elasmobranchii

Valid name: Procestration semirugosus
Original description species: (Quenstedt, 1851)
Genus: Bidentia Musper, 1920
Family: Heterodontidae Gray, 1851
Order: Heterodontiformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Megasqualus orpiensis
Original description species: Daimeries, 1888
Genus: Biforisodus Daimeries, 1888
Family: Squalidae De Blainville, 1816
Order: Squaliformes
Superorder: Squalomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Squalus minor
Original description species: Daimeries, 1888
Genus: Biforisodus Daimeries, 1888
Family: Squalidae De Blainville, 1816
Order: Squaliformes
Superorder: Squalomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Suárez & Cappetta, 2004
Genus: Biropristis Suárez & Cappetta, 2004
Family: Sclerorhynchidae Cappetta, 1974
Suborder: Sclerorhynchoidei
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Zangerl, 1981
Genus: Bobbodus Zangerl, 1981
Family: Eugeneodontidae Zangerl, 1981
Superfamily: Caseodontoidae
Order: Eugeneodontiformes
Subclass: Euchondrocephali

Original description species: Zangerl, 1981
Genus: Bobbodus Zangerl, 1981
Family: Eugeneodontidae Zangerl, 1981
Superfamily: Caseodontoidae
Order: Eugeneodontiformes
Subclass: Euchondrocephali

Genus: Bobbodus Zangerl, 1981
Family: Eugeneodontidae Zangerl, 1981
Superfamily: Caseodontoidae
Order: Eugeneodontiformes
Subclass: Euchondrocephali

Original description species: Hampe, Hairapetian, Dorka, Witzmann, Akbari & Korn, 2013
Genus: Bobbodus Zangerl, 1981
Family: Eugeneodontidae Zangerl, 1981
Superfamily: Caseodontoidae
Order: Eugeneodontiformes
Subclass: Euchondrocephali

Valid name: Triodus carinatus
Original description species: (Fritsch, 1890)
Genus: Bohemiacanthus Schneider, 1994
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Original description species: (Fritsch, 1890)
Genus: Bohemiacanthus Schneider, 1994
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Genus: Bohemiacanthus Schneider, 1994
Family: Xenacanthidae Fritsch, 1889
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Original description species: Gagnier, Turner, Friman,Suarez-Riglos & Janvier, 1988
Genus: Bolivacanthus Gagnier, Turner, Friman,Suarez-Riglos & Janvier, 1988
Family: incert. fam.
Order: incert. sedis
Subclass: Elasmobranchii

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

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

Valid name: Araloselachus cuspidatus
Original description species: (Menner, 1928)
Genus: Borealotodus Zhelezko In Zhelezko & Kozlov, 1999
Family: Odontaspididae Müller & Henle, 1839
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Araloselachus cuspidatus
Original description species: (Menner, 1928)
Genus: Borealotodus Zhelezko In Zhelezko & Kozlov, 1999
Family: Odontaspididae Müller & Henle, 1839
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

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

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

Original description species: Minikh & Andrushkevich, 2017
Genus: Borisocautus Minikh & Andrushkevich, 2017
Family: Xenosynechodontidae Glickman, 1980
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Synonyms: Borodinopristis cf. ackermani
Original description species: Case, Schwimmer, Borodin & Leggett, 2001
Genus: Borodinopristis Case, 1987
Family: Sclerorhynchidae Cappetta, 1974
Suborder: Sclerorhynchoidei
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Borodinopristis ackermani
Original description species: Case, Schwimmer, Borodin & Leggett, 2001
Genus: Borodinopristis Case, 1987
Family: Sclerorhynchidae Cappetta, 1974
Suborder: Sclerorhynchoidei
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Case, 1987
Genus: Borodinopristis Case, 1987
Family: Sclerorhynchidae Cappetta, 1974
Suborder: Sclerorhynchoidei
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Case, Cook, Wilson & Borodin, 2012
Genus: Borodinopristis Case, 1987
Family: Sclerorhynchidae Cappetta, 1974
Suborder: Sclerorhynchoidei
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Genus: Borodinopristis Case, 1987
Family: Sclerorhynchidae Cappetta, 1974
Suborder: Sclerorhynchoidei
Order: Rajiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Brachaelurus waddi-f
Original description species: (Bloch & Schneider, 1801)
Genus: Brachaelurus Ogilby, 1907
Family: Brachaeluridae Applegate, 1974
Order: Orectolobiformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Bernardez, 2002 (nomen nudum)
Genus: Brachaelurus Ogilby, 1907
Family: Brachaeluridae Applegate, 1974
Order: Orectolobiformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Cantioscyllium bighornensis
Original description species: Case, 1987
Genus: Brachaelurus Ogilby, 1907
Family: Brachaeluridae Applegate, 1974
Order: Orectolobiformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Cantioscyllium estesi
Original description species: (Herman, 1977)
Genus: Brachaelurus Ogilby, 1907
Family: Brachaeluridae Applegate, 1974
Order: Orectolobiformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Chiloscyllium greeni
Original description species: Cappetta, 1973
Genus: Brachaelurus Ogilby, 1907
Family: Brachaeluridae Applegate, 1974
Order: Orectolobiformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Case, Borodin & Leggett, 2001
Genus: Brachaelurus Ogilby, 1907
Family: Brachaeluridae Applegate, 1974
Order: Orectolobiformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Paraginglymostoma roklumensis
Original description species: Thies, 1981
Genus: Brachaelurus Ogilby, 1907
Family: Brachaeluridae Applegate, 1974
Order: Orectolobiformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Genus: Brachaelurus Ogilby, 1907
Family: Brachaeluridae Applegate, 1974
Order: Orectolobiformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Moreau & Mathis, 2000
Genus: Brachaelurus Ogilby, 1907
Family: Brachaeluridae Applegate, 1974
Order: Orectolobiformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Dracipinna bracheri
Original description species: Pfeil, 1984 (nomen nudum)
Genus: Bracheria Pfeil, 1984
Family: Dalatiidae Gray, 1851
Order: Squaliformes
Superorder: Squalomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Dracipinna bracheri
Original description species: Pfeil, 1984 (nomen nudum)
Genus: Bracheria Pfeil, 1984
Family: Dalatiidae Gray, 1851
Order: Squaliformes
Superorder: Squalomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Brachyacanthus semiplanus
Original description species: Fritsch, 1889
Genus: Brachiacanthus Fritsch, 1889
Family: incert. fam.
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Valid name: Brachiacanthus semiplanus
Original description species: Fritsch, 1889
Genus: Brachyacanthus Fritsch, 1889
Family: incert. fam.
Order: Xenacanthiformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Valid name: Brachycarcharias atlasi
Original description species: (Arambourg, 1952)
Genus: Brachycarcharias Cappetta & Nolf, 2005
Family: Odontaspididae Müller & Henle, 1839
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Brachycarcharias aff. atlasi, Carcharias aff. atlasi, Carcharias atlasi, Odontaspis aff. atlasi, Odontaspis atlasi, Odontaspis substriata atlasi
Original description species: (Arambourg, 1952)
Genus: Brachycarcharias Cappetta & Nolf, 2005
Family: Odontaspididae Müller & Henle, 1839
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Brachycarcharias lerichei
Original description species: (Casier, 1946)
Genus: Brachycarcharias Cappetta & Nolf, 2005
Family: Odontaspididae Müller & Henle, 1839
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Brachycarcharias twiggsensis
Original description species: (Case, 1981)
Genus: Brachycarcharias Cappetta & Nolf, 2005
Family: Odontaspididae Müller & Henle, 1839
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Carcharias aff. koerti , Carcharias koerti, Odontaspis cf. koerti, Odontaspis koerti, Odontaspis (Parodontaspis) koerti, Odontaspis (Synodontaspis) koerti, Otodus koerti, Serratolamna koerti, Synodontaspis koerti
Original description species: (Stromer, 1910)
Genus: Brachycarcharias Cappetta & Nolf, 2005
Family: Odontaspididae Müller & Henle, 1839
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Brachycarcharias cf. lerichei, Carcharias lerichei, Isurolamna lerichei, Lamna aff. lerichei, Lamna lerichei, Serratolamna lerichei
Original description species: (Casier, 1946)
Genus: Brachycarcharias Cappetta & Nolf, 2005
Family: Odontaspididae Müller & Henle, 1839
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Pseudodontaspis mississippiensis
Original description species: (Case, 1994)
Genus: Brachycarcharias Cappetta & Nolf, 2005
Family: Odontaspididae Müller & Henle, 1839
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Genus: Brachycarcharias Cappetta & Nolf, 2005
Family: Odontaspididae Müller & Henle, 1839
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Brachycarcharias cf. twiggsensis, Cretolamna twiggsensis, Lamna twiggsensis, Tethylamna cf. twiggsensis, Tethylamna twiggsensis
Original description species: (Case, 1981)
Genus: Brachycarcharias Cappetta & Nolf, 2005
Family: Odontaspididae Müller & Henle, 1839
Order: Lamniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Brachymylus cf. altidens
Original description species: Woodward, 1892
Genus: Brachymylus Woodward, 1892
Family: Callorhinchidae Garman, 1901
Order: Chimaeriformes
Subclass: Holocephali

Original description species: Averianov, 1992
Genus: Brachymylus Woodward, 1892
Family: Callorhinchidae Garman, 1901
Order: Chimaeriformes
Subclass: Holocephali

Valid name: Brachymylus altidens
Original description species: Woodward, 1892
Genus: Brachymylus Woodward, 1892
Family: Callorhinchidae Garman, 1901
Order: Chimaeriformes
Subclass: Holocephali

Original description species: Duffin, 1996
Genus: Brachymylus Woodward, 1892
Family: Callorhinchidae Garman, 1901
Order: Chimaeriformes
Subclass: Holocephali

Original description species: Woodward, 1892
Genus: Brachymylus Woodward, 1892
Family: Callorhinchidae Garman, 1901
Order: Chimaeriformes
Subclass: Holocephali

Genus: Brachymylus Woodward, 1892
Family: Callorhinchidae Garman, 1901
Order: Chimaeriformes
Subclass: Holocephali

Valid name: Brachyrhizodus wichitaensis
Original description species: Romer, 1942
Genus: Brachyrhizodus Romer, 1942
Family: incert. fam.
Order: incert. sedis
Subclass: Euchondrocephali

Synonyms: Pseudohypolophus ellipsis
Original description species: Case, Schwimmer, Borodin & Leggett, 2001
Genus: Brachyrhizodus Romer, 1942
Family: incert. fam.
Order: incert. sedis
Subclass: Euchondrocephali

Valid name: Pseudohypolophus mcnultyi
Original description species: (Thurmond, 1971)
Genus: Brachyrhizodus Romer, 1942
Family: incert. fam.
Order: incert. sedis
Subclass: Euchondrocephali

Valid name: Pseudohypolophus mcnultyi
Original description species: (Thurmond, 1971)
Genus: Brachyrhizodus Romer, 1942
Family: incert. fam.
Order: incert. sedis
Subclass: Euchondrocephali

Genus: Brachyrhizodus Romer, 1942
Family: incert. fam.
Order: incert. sedis
Subclass: Euchondrocephali

Synonyms: Brachyrhizodus cf. wichitaensis
Original description species: Romer, 1942
Genus: Brachyrhizodus Romer, 1942
Family: incert. fam.
Order: incert. sedis
Subclass: Euchondrocephali

Valid name: Bransonella nebraskensis
Original description species: (Johnson, 1984)
Genus: Bransonella Harlton, 1933
Family: incert. fam.
Order: Bransonelliformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Original description species: Ivanov & Ginter, 1996
Genus: Bransonella Harlton, 1933
Family: incert. fam.
Order: Bransonelliformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Synonyms: Bransonella cf. nebraskensis, Xenacanthus nebraskensis
Original description species: (Johnson, 1984)
Genus: Bransonella Harlton, 1933
Family: incert. fam.
Order: Bransonelliformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Genus: Bransonella Harlton, 1933
Family: incert. fam.
Order: Bransonelliformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Original description species: Elliott & Hodnett, 2013
Genus: Bransonella Harlton, 1933
Family: incert. fam.
Order: Bransonelliformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Valid name: Xenacanthus tridentatus
Original description species: Harlton, 1933
Genus: Bransonella Harlton, 1933
Family: incert. fam.
Order: Bransonelliformes
Superorder: Xenacanthimorpha
Subclass: Elasmobranchii

Synonyms: Nemacanthus brevis, Nemacanthus brevispinus
Original description species: Phillips, 1871
Genus: Breviacanthus Maisey, 1976
Family: Palaeospinacidae Regan, 1906
Order: Synechodontiformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Avonacanthus brevis
Original description species: (Agassiz, 1836)
Genus: Breviacanthus (Nemacanthus)
Family: Palaeospinacidae Regan, 1906
Order: Synechodontiformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Raja primarmata, Rhinobatos aff. primarmatus, Rhinobatos berytensis, Rhinobatos primarmatus, Rhinobatus berytensis
Original description species: (Woodward, 1889)
Genus: Britobatos Claeson, Underwood & Ward, 2013
Family: Trygonorrhinidae Last, Séret & Naylor, 2016
Order: Rhinopristiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Cope, 1875
Genus: Bryactinus Cope, 1875
Family: Callorhinchidae Garman, 1901
Order: Chimaeriformes
Subclass: Holocephali

Valid name: Ptychodus mammillaris
Original description species: Sternberg, 1829 (Nomina Oblita)
Genus: Buffonites Sternberg, 1829
Family: Ptychodontidae Jaekel, 1898
Order: incert. sedis
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Burnhamia daviesi
Original description species: (Woodward, 1889)
Genus: Burnhamia Cappetta, 1976
Family: Mobulidae Bonaparte, 1838
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Burnhamia aff. daviesi, Burnhamia (Rhinoptera) daviesi, Rhinoptera cf. daviesi, Rhinoptera daviesi, Rhinoptera daviesii
Original description species: (Woodward, 1889)
Genus: Burnhamia Cappetta, 1976
Family: Mobulidae Bonaparte, 1838
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Chomatodus davisi, Petalodus davisii
Original description species: (Woodward, 1889)
Genus: Burnhamia Cappetta, 1976
Family: Mobulidae Bonaparte, 1838
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Cappetta, 1985
Genus: Burnhamia Cappetta, 1976
Family: Mobulidae Bonaparte, 1838
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Genus: Burnhamia Cappetta, 1976
Family: Mobulidae Bonaparte, 1838
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Burnhamia daviesi
Original description species: (Woodward, 1889)
Genus: Burnhamia (Rhinoptera)
Family: Mobulidae Bonaparte, 1838
Order: Myliobatiformes
Superorder: Batomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Genus: Bythaelurus Compagno, 1988
Family: Pentanchidae Smith, 1912
Order: Carcharhiniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Original description species: Hovestadt & Hovestadt-Euler, 1995
Genus: Bythaelurus Compagno, 1988
Family: Pentanchidae Smith, 1912
Order: Carcharhiniformes
Superorder: Galeomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Valid name: Bythiacanthus ianishevskyi
Original description species: (Khabakov, 1928)
Genus: Bythiacanthus St. John & Worthen, 1875
Family: Heslerodidae Maisey, 2010
Order: Ctenacanthiformes
Superorder: Cladodontomorphi
Subclass: Elasmobranchii

Valid name: Avonacanthus brevis
Original description species: (Agassiz, 1836)
Genus: Bythiacanthus St. John & Worthen, 1875
Family: Heslerodidae Maisey, 2010
Order: Ctenacanthiformes
Superorder: Cladodontomorphi
Subclass: Elasmobranchii

Valid name: Bythiacanthus siderius
Original description species: (Leidy, 1870)
Genus: Bythiacanthus St. John & Worthen, 1875
Family: Heslerodidae Maisey, 2010
Order: Ctenacanthiformes
Superorder: Cladodontomorphi
Subclass: Elasmobranchii

Synonyms: Bythiacanthus aff. ianishevskyi
Original description species: (Khabakov, 1928)
Genus: Bythiacanthus St. John & Worthen, 1875
Family: Heslerodidae Maisey, 2010
Order: Ctenacanthiformes
Superorder: Cladodontomorphi
Subclass: Elasmobranchii

Original description species: Figueroa & Gallo, 2017
Genus: Bythiacanthus St. John & Worthen, 1875
Family: Heslerodidae Maisey, 2010
Order: Ctenacanthiformes
Superorder: Cladodontomorphi
Subclass: Elasmobranchii

Synonyms: Ctenacanthus lucasi
Original description species: (Eastman, 1902)
Genus: Bythiacanthus St. John & Worthen, 1875
Family: Heslerodidae Maisey, 2010
Order: Ctenacanthiformes
Superorder: Cladodontomorphi
Subclass: Elasmobranchii

Original description species: (Khabakov, 1928)
Genus: Bythiacanthus St. John & Worthen, 1875
Family: Heslerodidae Maisey, 2010
Order: Ctenacanthiformes
Superorder: Cladodontomorphi
Subclass: Elasmobranchii

Synonyms: Asteracanthus siderius, Bythiacanthus cf. siderius
Original description species: (Leidy, 1870)
Genus: Bythiacanthus St. John & Worthen, 1875
Family: Heslerodidae Maisey, 2010
Order: Ctenacanthiformes
Superorder: Cladodontomorphi
Subclass: Elasmobranchii

Synonyms: Ctenacanthus solidus
Original description species: (Eastman, 1902)
Genus: Bythiacanthus St. John & Worthen, 1875
Family: Heslerodidae Maisey, 2010
Order: Ctenacanthiformes
Superorder: Cladodontomorphi
Subclass: Elasmobranchii

Genus: Bythiacanthus St. John & Worthen, 1875
Family: Heslerodidae Maisey, 2010
Order: Ctenacanthiformes
Superorder: Cladodontomorphi
Subclass: Elasmobranchii

Original description species: St. John & Worthen, 1875
Genus: Bythiacanthus St. John & Worthen, 1875
Family: Heslerodidae Maisey, 2010
Order: Ctenacanthiformes
Superorder: Cladodontomorphi
Subclass: Elasmobranchii

Valid name: Janassa bituminosa
Original description species: Münster, 1843
Genus: Byzenos Münster, 1843
Family: Janassidae Jaekel, 1899
Order: Petalodontiformes
Subclass: Euchondrocephali