View source for List of xiphosuran genera

{{short description|None}}
This '''list of xiphosurans''' is a comprehensive listing of all [[genera]] that have ever been included in the order [[Xiphosura]], excluding purely vernacular terms. The list includes all commonly accepted genera, but also genera that are now considered invalid, doubtful (''[[nomen dubium]]''), or were not formally published (''[[nomen nudum]]''), as well as [[Synonym (zoology)|junior synonyms]] of more established names, genera that are no longer considered xiphosurans and misspellings. The list currently includes '''54''' names out of which '''31''' are considered valid xiphosuran genera.

As of 2019, there were around '''80''' extinct species of xiphosurans<ref>{{cite book|chapter-url=http://www.wsc.nmbe.ch/resources/fossils/Fossils19.5.pdf|title=World Spider Catalog|last1=Dunlop|first1=J. A.|last2=Penney|first2=D.|last3=Jekel|first3=D.|publisher=[[Natural History Museum Bern]]|year=2019|chapter=A summary list of fossil spiders and their relatives|pages=1–296}}</ref> and '''4''' extant species of xiphosurans recognized as valid.

== Naming conventions and terminology ==
There is no "official" or "canonical" list of xiphosuran genera. The closest thing is found contained in the regularly updated ''Summary list of fossil spiders and their relatives'' in the [[World Spider Catalog]], which include just the extinct species. The vast majority or all of the content of the list below, including the valid genera, preoccupied names, junior synonyms, misspellings, taxonomical classifications and sites of discovery, is based upon the 2019 edition of the summary list.

Naming conventions and terminology follow the [[International Code of Zoological Nomenclature]]. Technical terms used include:
* '''[[Synonym (zoology)|Junior synonym]]''': A name which describes the same taxon as a previously published name. If two or more genera are formally designated and the [[Type (zoology)|type specimens]] are later assigned to the same genus, the first to be published (in chronological order) is the senior synonym, and all other instances are junior synonyms. Senior synonyms are generally used, except by special decision of the ICZN, but junior synonyms cannot be used again, even if deprecated. Junior synonymy is often subjective, unless the genera described were both based on the same type specimen.
* '''''[[Nomen nudum]]''''' (Latin for "naked name"): A name that has appeared in print but has not yet been formally published by the standards of the ICZN. ''Nomina nuda'' (the plural form) are invalid, and are therefore not italicized as a proper generic name would be. If the name is later formally published, that name is no longer a ''nomen nudum'' and will be italicized on this list. Often, the formally published name will differ from any ''nomina nuda'' that describe the same specimen.
* '''''[[Nomen oblitum]]''''' (Latin for "forgotten name"): A name that has not been used in the scientific community for more than fifty years after its original proposal.
* '''Preoccupied name''': A name that is formally published, but which has already been used for another taxon. This second use is invalid (as are all subsequent uses) and the name must be replaced. As preoccupied names are not valid generic names, they will also go unitalicized on this list.
* '''''[[Nomen dubium]]''''' (Latin for "dubious name"): A name describing a fossil with no unique diagnostic features.

==Xiphosuran genera==
{{legend|#FFFFFF|Valid genera}}
{{legend|#E6E6E6|Non-valid genera}}
† = Extinct
{| border="0" style="width: 100%;"
! width="90%" |
! width="5%" |
! width="5%" |
|-
| valign="top" style="border:0px" |
{| class="wikitable"
|+
!'''Genus'''
!'''Author(s)'''
!'''Year'''
!'''Status'''
!'''Age'''
!'''Location'''
!Notes
|-
| †''[[Alanops]]''
|Racheboeuf
|[[2002 in paleontology|2002]]
|Valid
|[[Carboniferous]]
|
* {{flag|France}}
|
|-
| †''[[Anacontium]]''
|Raymond
|[[1944 in paleontology|1944]]
|Valid
|[[Permian]]
|
* {{flag|United States}}
|
|-
|†''[[Archeolimulus]]''
|Chlupáč 
|[[1963 in paleontology|1963]]
|Valid
|[[Middle Ordovician]] 
|
* {{CZE}}
|
|-
| †''[[Austrolimulus]]''
|Riek
|[[1955 in paleontology|1955]]
|Valid
|[[Triassic]]
|
* {{flag|Australia}}
|
|-
|style="background:#E6E6E6;" |
†''[[Belinuropsis]]''
|style="background:#E6E6E6;" |
Matthew
|style="background:#E6E6E6;" |
[[1910 in paleontology|1910]]
|style="background:#E6E6E6;" |
''[[Nomen dubium]]''
|style="background:#E6E6E6;" |
[[Carboniferous]]
|style="background:#E6E6E6;" |
* {{flag|Canada}}
|style="background:#E6E6E6;" |
Too poorly preserved to be assigned to any particular [[arthropod]] group.
|-
| †''[[Belinurus]]''
|Bronn
|[[1839 in paleontology|1839]]
|Valid<ref name="beli">{{cite journal|url=https://www.cambridge.org/core/services/aop-cambridge-core/content/view/99BE92900866081467547C811FC3DDEB/S0022336021000536a.pdf/belinurus_bronn_1839_chelicerata_xiphosura_has_priority_over_bellinurus_pictet_1846.pdf|title=''Belinurus'' Bronn, 1839 (Chelicerata, Xiphosura) has priority over ''Bellinurus'' Pictet, 1846|first1=James C.|last1=Lamsdell|first2=Matthew E.|last2=Clapham|journal=[[Journal of Paleontology]]|pages=1352–1355|year=2021|volume=95|issue=6|doi=10.1017/jpa.2021.53|doi-access=free}}</ref>
|[[Carboniferous]]
|
* {{flag|Canada}}
* {{flag|England}}
* {{flag|United States}}
* {{flag|Ukraine}}
* {{flag|Wales}}
|
|-
| †''[[Bellinuroopsis]]''
|Chernyshev
|[[1933 in paleontology|1933]]
|Valid
|[[Devonian]]
|
* {{flag|Russia}}
|
|-
|style="background:#E6E6E6;" |
†''[[Bellinurus]]''
|style="background:#E6E6E6;" |
Pictet
|style="background:#E6E6E6;" |
[[1846 in paleontology|1846]]
|style="background:#E6E6E6;" |
Synonym
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
Invalid name, ''Belinurus'' (Bronn, 1839) has priority.<ref name="beli" />
|-
|style="background:#E6E6E6;" |
†''[[Bifarius]]''
|style="background:#E6E6E6;" |
Tasch
|style="background:#E6E6E6;" |
[[1961 in paleontology|1961]]
|style="background:#E6E6E6;" |
Misidentification
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
Misidentified, an [[insect]].
|-
| ''[[Carcinoscorpius]]''
|Pocock
|1902
|Valid
|??? - present
|
* {{flag|India}}
* {{flag|Indonesia}}
* {{flag|Malaysia}}
* {{flag|Philippines}}
* {{flag|Singapore}}
* {{flag|Thailand}}
|
|-
| †''[[Casterolimulus]]''
|Holland, Erickson & O’Brien
|[[1975 in paleontology|1975]]
|Valid
|[[Cretaceous]]
|
* {{flag|United States}}
|
|-
| †''[[Crenatolimulus]]''
|Feldmann, Schweitzer, Dattilo & Farlow
|[[2011 in paleontology|2011]]
|Valid
|[[Cretaceous]]
|
* {{flag|United States}}
|
|-
|style="background:#E6E6E6;" |
†''[[Dubbolimulus]]''
|style="background:#E6E6E6;" |
Pickett
|style="background:#E6E6E6;" |
[[1984 in paleontology|1984]]
|style="background:#E6E6E6;" |
[[Jr. synonym]]
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
Synonym of ''[[Paleolimulus]]''.
|-
| †''[[Elleria]]''
|Raymond
|[[1944 in paleontology|1944]]
|Valid
|[[Devonian]]
|
* {{flag|United States}}
|
|-
|style="background:#E6E6E6;" |
†''[[Elmocephalus]]''
|style="background:#E6E6E6;" |
Tasch
|style="background:#E6E6E6;" |
[[1963 in paleontology|1963]]
|style="background:#E6E6E6;" |
Misidentification
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
Misidentified, a [[crustacean]]?
|-
|style="background:#E6E6E6;" |
†''[[Eolimulus]]''
|style="background:#E6E6E6;" |
Moberg
|style="background:#E6E6E6;" |
[[1892 in paleontology|1892]]
|style="background:#E6E6E6;" |
''[[Nomen dubium]]''
|style="background:#E6E6E6;" |
[[Cambrian]]
|style="background:#E6E6E6;" |
* {{flag|Sweden}}
|style="background:#E6E6E6;" |
|-
| †''[[Euproops]]''
|Meek
|[[1867 in paleontology|1867]]
|Valid
|[[Carboniferous]]&nbsp;- [[Permian]]?
|
* {{flag|England}}
* {{flag|France}}
* {{flag|Germany}}
* {{flag|South Korea}}
* {{flag|United States}}
* {{flag|Wales}}
|
|-
|style="background:#E6E6E6;" |
†''[[Heterolimulus]]''
|style="background:#E6E6E6;" |
Via Boada & Villalta
|style="background:#E6E6E6;" |
[[1966 in paleontology|1966]]
|style="background:#E6E6E6;" |
[[Jr. synonym]]
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
Synonym of ''[[Tachypleus]]''.
|-
|style="background:#E6E6E6;" |
†''[[Hypatocephala]]''
|style="background:#E6E6E6;" |
Tasch
|style="background:#E6E6E6;" |
[[1961 in paleontology|1961]]
|style="background:#E6E6E6;" |
Misidentification
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
Misidentified, an [[insect]].
|-
| †''[[Kasibelinurus]]''
|Pickett
|[[1993 in paleontology|1993]]
|Valid
|[[Devonian]]
|
* {{flag|Australia}}
* {{flag|China}}
|
|-
|style="background:#E6E6E6;" |
†''[[Koenigiella]]''
|style="background:#E6E6E6;" |
Raymond
|style="background:#E6E6E6;" |
[[1944 in paleontology|1944]]
|style="background:#E6E6E6;" |
[[Jr. synonym]]
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
Synonym of ''[[Bellinurus]]''.
|-
|style="background:#E6E6E6;" |
†''[[Lemoneites]]''
|style="background:#E6E6E6;" |
Flower
|style="background:#E6E6E6;" |
[[1969 in paleontology|1969]]
|style="background:#E6E6E6;" |
Misidentification
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
Misidentified, an [[echinoderm]].
|-
| †''[[Limulitella]]''
|Størmer
|[[1952 in paleontology|1952]]
|Valid
|[[Triassic]] - [[Jurassic]]
|
* {{flag|France}}
* {{flag|Germany}}
* {{flag|Madagascar}}
* {{flag|Netherlands}}
* {{flag|Russia}}
* {{flag|Tunisia}}
|
|-
|style="background:#E6E6E6;" |
†[[Limulites (xiphosuran)|Limulites]]
|style="background:#E6E6E6;" |
Schimper
|style="background:#E6E6E6;" |
[[1853 in paleontology|1853]]
|style="background:#E6E6E6;" |
Preoccupied
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
Preoccupied name, changed to ''[[Limulitella]]''.
|-
| ''[[Limulus]]''
|Müller
|1785
|Valid
|[[Triassic]] - present
|
* {{flag|England}}
* {{flag|Germany}}
* {{flag|Mexico}}
* {{flag|Poland}}
* {{flag|United States}}
|
|-
| †''[[Liomesaspis]]''
|Raymond
|[[1944 in paleontology|1944]]
|Valid
|[[Carboniferous]]&nbsp;-
[[Permian]]
|
* {{flag|Germany}}
* {{flag|United Kingdom}}
* {{flag|United States}}
|
|-
|style="background:#E6E6E6;" |
†[[Lophodesmus (xiphosuran)|Lophodesmus]]
|style="background:#E6E6E6;" |
Tesakov & Alekseev
|style="background:#E6E6E6;" |
[[1992 in paleontology|1992]]
|style="background:#E6E6E6;" |
Preoccupied
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
Preoccupied name, changed to ''[[Maldybulakia]]''.
|-
| †''[[Lunataspis]]''
|Young & Nowlan
|[[2008 in paleontology|2008]]
|Valid
|[[Ordovician]]
|
* {{flag|Canada}}
|
|-
| †''[[Maldybulakia]]''
|Tesakov & Alekseev
|[[1998 in paleontology|1998]]
|Valid
|[[Silurian]]
|
* {{flag|Australia}}
* {{flag|Kazakhstan}}
|
|-
| †''[[Mesolimulus]]''
|Størmer
|[[1952 in paleontology|1952]]
|Valid
|[[Triassic]] - [[Cretaceous]]
|
* {{flag|England}}
* {{flag|Germany}}
* {{flag|Russia}}
* {{flag|Spain}}
|
|-
|style="background:#E6E6E6;" |
†''[[Neobelinuropsis]]''
|style="background:#E6E6E6;" |
Eller
|style="background:#E6E6E6;" |
[[1938 in paleontology|1938]]
|style="background:#E6E6E6;" |
[[Jr. synonym]]
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
Synonym of ''[[Bellinuroopsis]]''.
|-
|style="background:#E6E6E6;" |
†''[[Palatinaspis]]''
|style="background:#E6E6E6;" |
Malz & Poschmann
|style="background:#E6E6E6;" |
[[1993 in paleontology|1993]]
|style="background:#E6E6E6;" |
[[Jr. synonym]]
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
Synonym of ''[[Liomesaspis]]''.
|-
| †''[[Paleolimulus]]''
|Dunbar
|[[1923 in paleontology|1923]]
|Valid
|[[Carboniferous]]&nbsp;- [[Triassic]]
|
* {{flag|Australia}}
* {{flag|Germany}}
* {{flag|Russia}}
* {{flag|United States}}
* {{flag|Ukraine}}
|
|-
| †''[[Panduralimulus]]''
|Allen & Feldman
|[[2005 in paleontology|2005]]
|Valid
|[[Permian]]
|
* {{flag|United States}}
|
|-
|style="background:#E6E6E6;" |
†''[[Permolimulinella]]''
|style="background:#E6E6E6;" |
Tasch
|style="background:#E6E6E6;" |
[[1963 in paleontology|1963]]
|style="background:#E6E6E6;" |
Misidentification
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
Misidentified, an [[insect]].
|-
|style="background:#E6E6E6;" |
†''[[Pincombella]]''
|style="background:#E6E6E6;" |
Chapman
|style="background:#E6E6E6;" |
[[1932 in paleontology|1932]]
|style="background:#E6E6E6;" |
Misidentification
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
Misidentified, an [[insect]].
|-
|style="background:#E6E6E6;" |
†[[Prestwichia (xiphosuran)|Prestwichia]]
|style="background:#E6E6E6;" |
Woodward
|style="background:#E6E6E6;" |
[[1867 in paleontology|1867]]
|style="background:#E6E6E6;" |
Preoccupied
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
Preoccupied name, changed to ''[[Euproops]]''.
|-
|style="background:#E6E6E6;" |
†''[[Prestwichianella]]''
|style="background:#E6E6E6;" |
Cockerell
|style="background:#E6E6E6;" |
[[1905 in paleontology|1905]]
|style="background:#E6E6E6;" |
Replacement name
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
Replacement name for [[Prestwichia (xiphosuran)|Prestwichia]].
|-
|style="background:#E6E6E6;" |
†''[[Pringlia]]''
|style="background:#E6E6E6;" |
Raymond
|style="background:#E6E6E6;" |
[[1944 in paleontology|1944]]
|style="background:#E6E6E6;" |
[[Jr. synonym]]
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
Synonym of ''[[Liomesaspis]]''.
|-
| †''[[Prolimulus]]''
|Frič
|[[1899 in paleontology|1899]]
|Valid
|[[Carboniferous]]
|
* {{flag|Czech Republic}}
|
|-
| †''[[Psammolimulus]]''
|Lange
|[[1923 in paleontology|1923]]
|Valid
|[[Triassic]]
|
* {{flag|Germany}}
|
|-
| †''[[Rolfeia]]''
|Waterston
|[[1985 in paleontology|1985]]
|Valid
|[[Carboniferous]]
|
* {{flag|Scotland}}
|
|-
|style="background:#E6E6E6;" |
†''[[Steropsis (xiphosuran)|Steropsis]]''
|style="background:#E6E6E6;" |
Baily
|style="background:#E6E6E6;" |
[[1869 in paleontology|1869]]
|style="background:#E6E6E6;" |
[[Jr. synonym]]
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
Synonym of ''[[Bellinurus]]''.
|-
|style="background:#E6E6E6;" |
†''[[Strongylocephalus]]''
|style="background:#E6E6E6;" |
Tasch
|style="background:#E6E6E6;" |
[[1961 in paleontology|1961]]
|style="background:#E6E6E6;" |
Misidentification
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
Misidentified, an [[insect]].
|-
| ''[[Tachypleus]]''
|Leach
|1819
|Valid
|[[Triassic]] - present
|
* {{flag|China}}
* {{flag|Indonesia}}
* {{flag|Japan}}
* {{flag|Lebanon}}
* {{flag|Malaysia}}
* {{flag|Philippines}}
* {{flag|South Korea}}
* {{flag|Spain}}
* {{flag|Taiwan}}
* {{flag|Vietnam}}
|
|-
| †''[[Tarracolimulus]]''
|Romero & Via Boada
|[[1977 in paleontology|1977]]
|Valid
|[[Triassic]]
|
* {{flag|Spain}}
|
|-
| †''[[Vaderlimulus]]''
|Lerner, Lucas & Lockley
|[[2017 in paleontology|2017]]
|Valid
|[[Triassic]]
|
* {{flag|United States}}
|
|-
| †''[[Valloisella]]''
|Racheboeuf
|[[1992 in paleontology|1992]]
|Valid
|[[Carboniferous]]
|
* {{flag|France}}
|
|-
|style="background:#E6E6E6;" |
†"[[Veltheimia (xiphosuran)|Veltheimia]]"
|style="background:#E6E6E6;" |
Beyschlag & von Fritsch
|style="background:#E6E6E6;" |
[[1899 in paleontology|1899]]
|style="background:#E6E6E6;" |
''[[Nomen nudum]]''
|style="background:#E6E6E6;" |
[[Carboniferous]]?
|style="background:#E6E6E6;" |
* {{flag|Germany}}
|style="background:#E6E6E6;" |
|-
| †''[[Victalimulus]]''
|Riek & Gill
|[[1971 in paleontology|1971]]
|Valid
|[[Cretaceous]]
|
* {{flag|Australia}}
|
|-
| †''[[Willwerathia]]''
|Størmer
|[[1969 in paleontology|1969]]
|Valid
|[[Devonian]]
|
* {{flag|Germany}}
|
|-
| †''[[Xaniopyramis]]''
|Siveter & Selden
|[[1987 in paleontology|1987]]
|Valid
|[[Carboniferous]]
|
* {{flag|England}}
|
|-
|style="background:#E6E6E6;" |
''[[Xiphosura (genus)|Xiphosura]]''<ref>{{cite journal|jstor=1299851|title=Phylogeny and Taxonomy of Fossil Horseshoe Crabs|author=Leif Størmer|journal=Journal of Paleontology|volume=26|date=July 1952|issue=4|pages=630–640}}</ref>
|style="background:#E6E6E6;" |

|style="background:#E6E6E6;" |

|style="background:#E6E6E6;" |
[[Jr. synonym]]
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
N/A
|style="background:#E6E6E6;" |
Synonym of ''[[Limulus]]''.
|-
| †''[[Xiphosuroides]]''<ref>{{cite journal|url=https://rd.springer.com/article/10.1134/S0031030118040111|title=First Fossil Xiphosuran (Chelicerata, Xiphosura) Egg Clutch from the Carboniferous of Khakassia|journal=Paleontological Journal|volume=52|issue=4|pages=400–404|last1=E. S.|first1=Shpinev|last2=D. V.|first2=Vasilenko|year=2018|doi=10.1134/S0031030118040111|s2cid=86861187|url-access=subscription}}</ref>
|Shpinev & Vasilenko
|[[2018 in paleontology|2018]]
|Valid
|[[Carboniferous]]
|
* {{flag|Russia}}
|
|-
| †''[[Yunnanolimulus]]''
|Zhang, Hu, Zhou, Iv & Bai
|[[2009 in paleontology|2009]]
|Valid
|[[Triassic]]
|
* {{flag|China}}
|
|-
|}
| valign="top" style="border:0px" |
| valign="top" style="border:0px" |
{| border="0" align="right" style="background:transparent;"
|[[File:Austrolimulus fletcheri.jpg|thumb|''[[Austrolimulus fletcheri]]'']]
|-
|[[File:Xiphosura - Belinurus lunatus.JPG|thumb|''[[Belinurus lunatus]]'']]
|-
|[[File:Carcinoscorpius rotundicauda (Chonburi).jpg|thumb|''[[Carcinoscorpius rotundicauda]]'']]
|-
|[[File:Euproops danae.jpg|thumb|''[[Euproops danae]]'']]
|-
|[[File:Limule(dD).jpg|thumb|''[[Limulus polyphemus]]'']]
|-
|[[File:Naturkundemuseum Berlin - Mesolimulus walchi - Solnhofen.jpg|thumb|''[[Mesolimulus walchi]]'']]
|-
|[[File:Belinuridae - Prestwichia anthrax.JPG|thumb|''[[Prestwichia anthrax]]'']]
|-
|[[File:Tachypleus tridentatus.jpg|thumb|''[[Tachypleus tridentatus]]'']]
|}
|}

==Xiphosuran ichnogenera==
{| border="0" style="width: 100%;"
! width="90%" |
! width="5%" |
! width="5%" |
|-
| valign="top" style="border:0px" |
{| class="wikitable sortable"
|+
!'''Genus'''
!'''Author(s)'''
!'''Year'''
!'''Status'''
!'''Age'''
!'''Location'''
|-
|†''[[Kouphichnium]]''<ref>{{cite web|url=http://www.envs.emory.edu/faculty/MARTIN/ichnology/Kouphichnium.htm|title=''Kouphichnium'' isp.|first=Anthony J.|last=Martin|access-date=2018-02-20|archive-url=https://web.archive.org/web/20150322042513/http://www.envs.emory.edu/faculty/MARTIN/ichnology/Kouphichnium.htm|archive-date=2015-03-22|url-status=dead}}</ref>
|Nopcsa
|[[1923 in paleontology|1923]]
|Valid
|[[Carboniferous]] -<br/>[[Jurassic]]
|
* {{flag|Argentina}}
* {{flag|England}}
* {{flag|France}}
* {{flag|Germany}}
* {{flag|Mexico}}
* {{flag|Poland}}
* {{flag|United States}}
|-
|†[[Selenichnites]]
|Romano &
Whyte
|[[1987]]
|Valid
|[[Cambrian]] - 
[[Jurassic|Jurrasic]]
|N/A
|-
|}
|}

== See also ==
*[[List of eurypterid genera]]
*[[List of trilobite genera]]
*[[List of ammonite genera]]
*[[List of prehistoric malacostracans]]

== References ==
{{reflist}}

[[Category:Xiphosura]]
[[Category:Lists of prehistoric arthropods]]
[[Category:Lists of animal genera (alphabetic)|Xiphosura]]