page_title: List of the prehistoric life of South Dakota
section_title: Paleozoic
hierarchical_section_title: List of the prehistoric life of South Dakota / Paleozoic
caption_attribution_description: English: A Tricrepicephalus texanus trilobite, 19mm, Order Ptychopariida, Family Tricrepicephalidae, collected from the Weeks Formation, Millard County, Utah, USA, from the Middle Cambrian
context_page_description: This list of the prehistoric life of South Dakota contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of South Dakota.
context_section_description: †Acrotreta
  †Agnostogonus
  †Agnostogonus incognitus – or unidentified comparable form
    †Agnostus
  †Amiaspis
  †Amiaspis erratica
  †Ankoura
  †Ankoura triangularis
  †Ankoura triangularus
  †Aphelaspis
  †Aphelaspis haguei
  †Arapahoia
  †Arapahoia spathulata
  †Arapahoia spatulata
  †Arcifimbria
  †Arcifimbria pahasapaensis
  †Arcifimbrin
  †Arcifimbrin pahasapaensis
  †Arcuolimbus
  †Arcuolimbus convexus
  †Billingsella
  †Billingsella wichitaensis
  †Blountia
  †Blountia arcuosa
  †Blountia arion
  †Blountia bristolensis
  †Blountia eleanora
  †Blountia janei
  †Blountia nixonensis
  †Blountiella
  †Blountiella alberta
  †Blountiella cordilleria
  †Briscoia
  †Briscoia angustilimba – or unidentified comparable form
  †Briscoia dalyi
  †Bynumia
  †Bynumia eumus
  †Bynumina
  †Camaraspis
   †Caseodus
  †Caseodus eatoni – or unidentified related form
  †Cedaria
  †Cedarina
  †Cedarina cordillerae
  †Cedarina dakotaensis
  †Cedarina dakotensis
  †Cheilocephalus
  †Cheilocephalus brevilobus
  †Cladodus – or unidentified comparable form
  †Clelandia
  †Clelandia typicalis
  †Coosella
  †Coosella onusta
  †Coosella perplexa
  †Coosella prolifica
  †Coosia
  †Coosia albertensis
  †Coosia alethes
  †Coosina
  †Coosina ariston
  †Crepicephalus
  †Crepicephalus auratus
  †Crepicephalus buttsimontanaenis
  †Crepicephalus buttsimontanaensis
  †Crepicephalus buttsimotanaensis
  †Crepicephalus deadwoodensis
  †Crepicephalus rectus
  †Crepicephalus snowyenis
  †Crepicephalus snowyensis
  †Cyclendoceras
  †Cyrtogomphoceras
  †Dartonaspis
  †Dartonaspis wichitaensis
  †Dartonaspis witchitaensis
  †Deadwoodia
  †Dicellomus
  †Diestoceras
  †Dikelocephalus
  †Dikelocephalus minnesotensis
  †Dresbachia
  †Dresbachia amata
   †Edestus
  †Ellipsocephaloides
  †Ellipsocephaloides curtus
  †Ellipsocephaloides monensis
  †Ellipsocephaloides monsensis
  †Endoceras
  †Eoorthis
  †Eoorthis indianola
  †Eoorthis remnicha
  †Ephippiorthoceras
  †Glaphyraspis
  †Glaphyraspis newtoni
  †Glaphyraspis parva
  †Hadragnostus
  †Hadragnostus modestus
  †Hardyoides
  †Hardyoides tenerus
  †Holmesella
  †Holmesella quadrata
  †Homagnostus
  †Homagnostus obesus
   †Hyolithes
  †Hysteropleura
  †Hysteropleura schucherti
  †Idahoia
  †Idahoia serapio
  †Idahoia wisconsensis
  †Idiomesus
  †Idiomesus granti
  †Idiomesus infimus
  †Illaenurus
  †Illaenurus priscus
   †Janassa
  †Kingstonia
  †Kingstonia bealesoides
  †Kingstonia scrinium
  †Kingstonia spicata
  †Kingstonia spicta
  †Kingstonia walcotti
  †Kingstonia walcottia
  †Komaspidella
  †Komaspidella hata
  †Komaspidella lata
  †Kormagnostus
  †Kormagnostus beltensis
  †Kormagnostus seclusus
  †Lambeoceras – tentative report
  †Lingulella
  †Lingulepis
  †Linnarssonella
   †Listracanthus
  †Listracanthus hystrix
  †Litagnostus
  †Litagnostus paralis
  †Llanoaspis
  †Llanoaspis undulata
  †Meniscocorypphe
  †Meniscocorypphe platycephala
  †Menomonia
  †Menomonia prooculis
  †Meteoraspis
  †Meteoraspis keeganensis
  †Meteoraspis metra
  †Meteoraspis robusta
  †Modocia
  †Modocia centralis
  †Modocia oweni
  †Monocheilus
  †Monocheilus micros
  †Monocheilus truncatus
  †Nahannagnostus
  †Nahannagnostus nganasanicus
  †Nahannagnostus nganasanious
  †Parabolinoides
  †Parabolinoides contractus
  †Parabolinoides granulosus
  †Pemphigaspis
  †Pemphigaspis bullata
  †Petrodus
  †Petrodus patelliformis
  †Plethopeltis
  †Prosaukia
  †Prosaukia misa
  †Pseudagnostus
  †Pseudagnostus douvillei
  †Pseudagnostus josephus
  †Ptchaspis
  †Ptchaspis striata
  †Ptychaspis
  †Ptychaspis bullasa
  †Ptychaspis miniscaensis
  †Ptychopleurites
  †Ptychopleurites spinosa
  †Pugionicauda
  †Pugionicauda paradoxa
  †Rasettia
  †Rasettia capax
  †Rasettia magna
  †Saukiella
  †Saukiella pyrene
  †Spyroceras
  †Syspacheilus
  †Taenicephalus
  †Taenicephalus nasutus
  †Taenicephalus shumardi
  †Terranovella
  †Terranovella dorsalis
   †Tricrepicephalus
  †Tricrepicephalus conia
  †Tricrepicephalus coria
  †Tricrepicephalus metra
  †Tricrepicephalus tripunctatus
  †Tripteroceras
  †Uncaspis
  †Uncaspis limbata
  †Uncaspis unca
  †Welleraspis
  †Welleraspis group#1 – informal
  †Welleraspis group#2 – informal
  †Westonoceras
  †Wilsonoceras
  †Winnipegoceras
caption: Fossil of the Cambrian trilobite Tricrepicephalus
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