# Eozetetes

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{{Short description|Extinct genus of Cambrian arthropod}}
{{Speciesbox
| fossil_range = {{fossil range|Cambrian Stage 4}}
| image = 
| image_caption =
| display_parents = 2
| genus = Eozetetes
| parent_authority = Edgecombe et al, 2016
| species = gemmelli
| authority = Edgecombe et al, 2016
}}

'''''Eozetetes''''' is a genus of [vicissicaudata](/source/vicissicaudata)n [artiopod](/source/artiopod) from the [Emu Bay Shale](/source/Emu_Bay_Shale) of Australia. It contains one species, '''''Eozetetes gemmelli'''''.<ref name=dawn>{{cite journal |last1=Edgecombe |first1=Gregory D. |last2=Paterson |first2=John R. |last3=García-Bellido |first3=Diego C. |title=A new aglaspidid-like euarthropod from the lower Cambrian Emu Bay Shale of South Australia |journal=Geological Magazine |date=January 2017 |volume=154 |issue=1 |pages=87–95 |doi=10.1017/S0016756815001053|bibcode=2017GeoM..154...87E }}</ref>

== Description ==
''Eozetetes'' is roughly 3&nbsp;cm long, with the tail spine making up half of this. The cephalic shield is semicircular with no genal spines and a relatively wide doublure. The [hypostome](/source/hypostome_(trilobite)) is attached to the doublure, with a vaguely nose-like shape preserved extending most of the cephalic shield's length. Only one antenna is preserved, with it being long and flagelliform (whip-like) with only slight tapering. Several joints are preserved, with each segment roughly the same size. The trunk has 18 tergites (segments) with the second being widest. These tergites are distinctly three-lobed, with the axis being set apart by a break in the slope. The tergopleurae (part of the tergite which is not the axis) are broad with gently curved anterolateral margins and acute tips, which markedly narrow from the tenth tergite onwards alongside becoming more curved and pointed. The tergites also overlap abaxially, with a pair of nodes on the first 13 becoming more keel-shaped up to the eighteenth tergite. The last tergite is seemingly ring-shaped with no nodes or tergopleurae. The tail spine is about as wide as this last tergite, sharply tapering in the first 3&nbsp;mm and then remaining a constant width. This large anterior section also bears a keel-like ridge.<ref name=dawn/> ''Eozetetes'' closely resembles ''[Emeraldella](/source/Emeraldella)'', ''[Carimersa](/source/Carimersa)'' and [aglaspidid](/source/aglaspidid)s (in fact being related to these last two<ref>{{cite journal |last1=Briggs |first1=Derek E. G. |last2=Siveter |first2=David J. |last3=Siveter |first3=Derek J. |last4=Sutton |first4=Mark D. |last5=Legg |first5=David |last6=Lamsdell |first6=James C. |title=A vicissicaudatan arthropod from the Silurian Herefordshire Lagerstätte, UK |journal=Royal Society Open Science |date=August 2023 |volume=10 |issue=8 |doi=10.1098/rsos.230661 |doi-access=free|pmid=37538743 |pmc=10394423 |bibcode=2023RSOS...1030661B }}</ref>), however features such as a differing amount of tergopleurae, a lack of caudal flaps and apparent lack of an articulated tailspine set it apart from the former, with the lack of a mineralised exoskeleton setting it apart from aglaspidids.<ref name=dawn/>

== Etymology ==

The genus name ''Eozetetes'' translates to "early searcher", which alongside the species name ''gemmelli'' honours Mike Gemmell, a member of the paper authors' field team, for moving vast quantities of Emu Bay Shale rocks alongside discovering numerous superb specimens.<ref name=dawn/>

== Taxonomy ==
''Eozetetes'' has been placed within the clade [Vicissicaudata](/source/Vicissicaudata), a subgroup of [Artiopoda](/source/Artiopoda), the clade containing [trilobites](/source/trilobites) and their close relatives. Within Vicissicaudata, it has often been placed as a close relative of [Aglaspidida](/source/Aglaspidida). Cladogram after McCoy et al. 2025:<ref name="tardisia2">{{cite journal |last1=McCoy |first1=Victoria E. |last2=Herrera |first2=Fabiany |last3=Wittry |first3=Jack |last4=Mayer |first4=Paul |last5=Lamsdell |first5=James C. |date=2025 |title=A possible vicissicaudatan arthropod from the Late Carboniferous Mazon Creek Lagerstätte |journal=Geological Magazine |volume=162 |doi=10.1017/S001675682400044X|bibcode=2025GeoM..162E...3M |doi-access=free }}</ref>{{Clade|{{clade
   |label1=[Vicissicaudata](/source/Vicissicaudata)
   |1={{Clade sequential
      |1=''[Molaria spinifera](/source/Molaria_spinifera)'' 70px
      |2=''[Emeraldella brocki](/source/Emeraldella_brocki)''
      |3=''[Emeraldella brutoni](/source/Emeraldella_brutoni)'' 100px
      |4={{Clade sequential
         |1=''[Sidneyia inexpectans](/source/Sidneyia_inexpectans)'' 100px
         |2=''[Tardisia broedeae](/source/Tardisia)''
         |3=[Cheloniellida](/source/Cheloniellida)  150px
         }}
      |5=''[Carimersa neptuni](/source/Carimersa_neptuni)''
      |6=''[Kodymirus vagans](/source/Kodymirus_vagans)'' 70px
      |7=''Eozetetes gemelli''
      |8=[Aglaspidida](/source/Aglaspidida) 100px
}} }}|label1=}}

== References ==
{{reflist}}

{{Artiopoda}}

{{Taxonbar|from=Q133150663}}

Category:Artiopoda
Category:Monotypic artiopod genera
Category:Prehistoric arthropods of Australia
Category:Emu Bay Shale
Category:Fossil taxa described in 2016

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