# Primoriella

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> Markdown URL: https://mediated.wiki/source/Primoriella.md
> Source: https://en.wikipedia.org/wiki/Primoriella
> Source revision: 1321841477
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{{Short description|Genus of trilobites}}
{{Automatic taxobox
| fossil_range = {{Geological range|518|513|latest [Lower Cambrian](/source/Lower_Cambrian)}}
| image = 
| image_caption = 
| taxon = Primoriella
| authority = Repina, 1973
| subdivision_ranks = Species
| subdivision = 
{{Species list
|Primoriella bella|Repina, 1973 ([type species](/source/Type_(biology)))
}}
}}

'''''Primoriella''''' is a [genus](/source/genus) of [trilobite](/source/trilobite), an extinct group of [marine](/source/Marine_habitat) [arthropod](/source/arthropod)s. The only known species, ''P. bella'' occurs in the uppermost Lower Cambrian of Russia (''Redlichina culmenica'' beds, far eastern Siberia). It is related to ''[Paradoxides](/source/Paradoxides)'', but can be distinguished from it by only slightly forward expansion of the ([glabella](/source/Trilobite)) a character shared with ''[Anabaraceps](/source/Anabaraceps)'' and  ''[Schagonaria](/source/Schagonaria)''. In ''Primoriella'' however, the front of the glabella touches the roll-like border, causing it to slightly bulge forward, while in ''Anabaraceps'' there is a  roll-like preglabellar field as wide as the flat border in front of it. The glabella of ''Primordiella'' is less than twice as long as wide, and differs from ''Schagonaria'' in which it is more than twice as long as wide.<ref name='Treatise'>{{cite book|editor= Whittington, H. B.|series= [Treatise on Invertebrate Paleontology](/source/Treatise_on_Invertebrate_Paleontology)|title= Part O, Revised, Volume 1 – Trilobita – Introduction, Order Agnostida, Order Redlichiida|year= 1997|pages= 473, 478|display-editors=etal}}</ref> The [thorax](/source/Trilobite) and [pygidium](/source/Trilobite) are not known.

== References ==
{{Reflist}}

{{Taxonbar|from=Q20720439}}

Category:Cambrian trilobites
Category:Paradoxidoidea
Category:Fossils of Russia
Category:Fossil taxa described in 1973
Category:Redlichiida genera

{{Redlichiida-stub}}

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