# Entomaspis

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{{Short description|Extinct genus of trilobites}}
{{Automatic taxobox
| fossil_range = {{Fossil range|Furongian|Tremadocian}}
| image = Entomaspis radiata.JPG
| image_caption = ''E. radiata''
| taxon = Entomaspis
| authority = Ulrich, 1931
| type_species=''Entomaspis radiata''
| type_species_authority = Ulrich, 1931
| subdivision_ranks = Species
| subdivision = 
*''E. bridgei'' <small>Rasetti 1952</small>
*''E. clarki'' <small>Raymond 1937</small>
*''E. radiata'' <small>Ulrich, 1931</small>
*''E. rawi'' <small>(Ross Jr. 1951)</small>
}}

'''''Entomaspis''''' is an extinct [genus](/source/genus) of [harpetid](/source/harpetida) [trilobite](/source/trilobite) from Upper [Cambrian](/source/Cambrian) to Early [Ordovician](/source/Ordovician) marine strata of the [United States](/source/United_States).  Species are typified by their proportionally large, vaulted, croissant-shaped or bonnet-shaped cephalons that have the cheeks freed to become elongated, curved librigenial spines, and by their comparatively large, crescent-shaped eyes (in comparison with other eyed harpetids).

==Species==

===''E. bridgei''===
''E. bridgei'' is a species found in marine strata of [Missouri](/source/Missouri).

===''E. clarki''===
''E. clarki'' is a species found in Lower Ordovician marine strata of [Vermont](/source/Vermont).<ref name=Shaw>Shaw, Alan B. "Paleontology of Northwestern Vermont. XII. Fossils from the Ordovician Highgate Formation." Journal of Paleontology (1966): 1312-1330.</ref>

===''E. radiata''===
''E. radiata'' is the type species, and is found in Uppermost Cambrian and Lowermost Ordovician marine strata of Utah.  It coexisted [sympatrically](/source/Sympatry) with ''E. rawi''.

===''E. rawi''===
''E. rawi'' was originally described as ''Hypothetica rawi'', and coexisted with ''E. radiata'' in Lowermost Ordovician marine strata of Utah.<ref name='Treatise'>{{cite book|last= Moore|first= R.C.|year= 1959|title= Arthropoda I - Arthropoda General Features, Proarthropoda, Euarthropoda General Features, Trilobitomorpha|publisher= Geological Society of America/University of Kansas Press|series= [Treatise on Invertebrate Paleontology](/source/Treatise_on_Invertebrate_Paleontology)|volume= Part O.|pages=1–560, 419|location= Boulder, Colorado/Lawrence, Kansas|isbn= 0-8137-3015-5}}</ref>

==References==
{{Reflist}}

== Sources ==
*[http://www.trilobites.info/galharpetida.htm'' Trilobite info (Sam Gon III)'']

==External links==
*[http://www.trilobites.info '' Trilobite info (Sam Gon III)'']

{{Taxonbar|from=Q22285143}}

Category:Harpetida
Category:Cambrian trilobites
Category:Ordovician trilobites
Category:Fossils of the United States
Category:Ordovician genus extinctions
Category:Trilobite genera

{{harpetida-stub}}

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Adapted from the Wikipedia article [Entomaspis](https://en.wikipedia.org/wiki/Entomaspis) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Entomaspis?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.