page_title: List of the Paleozoic life of Utah
section_title: A
hierarchical_section_title: List of the Paleozoic life of Utah / A
caption_attribution_description: English: The moulting remains of the trilobite Agnostus pisiformis, the loose cephalons and pygidia are upto 4 mm along the axis, Order Agnostida, Family Agnostidae, found at Kakeled on Kinnekulle, Västergötland, Sweden, early Upper Cambrian (Paibian, Agnostus pisiformis-zone)
context_page_description: This list of the Paleozoic life of Utah contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Utah and are between 541 and 252.17 million years of age.
context_section_description: †Acanthopecten
  †Acanthopecten carboniferus
  †Acanthopecten coloradoensis
  †Achlysopsis
  †Achlysopsis liokata – or unidentified comparable form
  †Achlysopsis punctatum
  †Acidiphorus
  †Acidiphorus brevis – or unidentified comparable form
  †Acidiphorus brevus
  †Acidiphorus brighti
  †Acidiphorus pseudobathurus
  †Acidiphorus unicorna – type locality for species
  †Acidiphorus wahwahensis
  †Acidiphorus williamsi – type locality for species
  †Acinocricus
  †Acinocricus stichus
  †Acodus
  †Acodus similaris
  †Acontiodus
  †Acontiodus coniformis
  †Acrothele
  †Acrothele subsidua
  †Acrotreta
  †Adiantites
  †Adiantites tenuifolius
  †Aesiocrinus
  †Aesiocrinus secundus – type locality for species
   †Agnostus
  †Agnostus neglectus
  †Allorisma
  †Allorynchus
  †Alokistocare
  †Alokistocare carnatum
  †Alokistocare harrisi
  †Alokistocare idahoense
  †Alokistocare normale
  †Alokistocare subcoronatum
  †Alokistocarella
  †Alokistocarella brighamensis
  †Altiocculus
  †Altiocculus concavus
  †Altiocculus drumensis
  †Amblycranium
  †Amblycranium cornutum
  †Amblycranium linearus – type locality for species
  †Amblycranium variabile
  †Amecephalus
  †Amecephalus laticudum
  †Ameura – tentative report
  †Ammagnostus
  †Ammagnostus beltensis
  †Amphiscapha
  †Amplexizaphrentis
  †Amplexizaphrentis paucicinctus
  †Amplexizaphrentis spinulosus
  †Amplexizaphrentis subcrassus
  †Amplexocarina
  †Amplexus
  †Anabarochilna
  †Anabarochilna australis – or unidentified comparable form
  †Ananias
  †Ananias nevadensis – or unidentified related form
  †Ancillotoechia
  †Ancillotoechia perryi – type locality for species
  †Anemonaria
  †Anemonaria delicatula
  †Angulotreta
  †Angyomphalus
  †Angyomphalus regularis
  †Anidanthus
  †Anidanthus echaris
  †Anisopyge
  †Anisotrypa
  †Annularia
  †Annularia stellata
  †Annulispongia – type locality for genus
  †Annulispongia interrupta – type locality for species
   †Anomalocaris
  †Anomalocaris nathorsti
  †Anomalorthis
  †Anomalorthis lambda
  †Anomalorthis oklahomensis
  †Anomalorthis utahensis
  †Anomphalus
  †Anomphalus rotulus
  †Anthaspidella
  †Anthracospirifer
  †Anthracospirifer increbescens
  †Anthracospirifer leidyi
  †Anthracospirifer occiduus
  †Antiquatonia
  †Antiquatonia portlockianus
  †Antiquatonia sulcatus – or unidentified comparable form
  †Apachella
  †Apatognathus
  †Aphelaspis
  †Aphelaspis haguei
  †Aphelotoxon
  †Aphelotoxon acuminata
  †Apheoorthis
  †Apheoorthis melita – or unidentified comparable form
  †Apheorthis
  †Apheorthis meeki – or unidentified comparable form
  †Archaeocalamites
  †Archaeocalamites scrobiculatus
  †Archaeocothurnus – tentative report
  †Archaeocothurnus bifida – type locality for species
  †Archaeoscyphia
  †Archaeoscyphia rossi
  †Archeocalamites
  †Archeocalamites radiatus
  †Archeoschyphia
    †Archimedes
  †Archimedes macfarlani
  †Archimedes owenanus
  †Arcuolimbus
  †Arenicolites
  †Arroyocrinus
  †Arroyocrinus stokesi – type locality for species
  †Arthrophycus – tentative report
  †Artisia
  †Asaphelina
  †Asaphellus – tentative report
   †Asaphiscus
  †Asaphiscus wheeleri
  †Ascopora
  †Ascopora macellata
  †Astartella
  †Astartella subquadrata
  †Asterophyllites
  †Asterophyllites charaeformis
  †Asterophyllites equisetiformis
  †Asterophyllites longifolius
  †Athabaskia
  †Athabaskia bithus
  †Athabaskia wasatchensis
  †Athyridacid
  †Athyris
  †Athyris lamellosa
   †Atrypa
  †Atrypa hedei
  †Atrypa parva – or unidentified comparable form
  †Atrypid
  †Aulacoparia – tentative report
  †Aulacoparia quadrata
  †Aulacoparia venta
  †Aulacotheca
  †Aulacotheca campbellii
  †Aulacotheca hemingwayi
  †Aulopora – tentative report
  †Aviculopecten
  †Aviculopecten girtyi
  †Aviculopecten kaibabensis – or unidentified comparable form
  †Aviculopinna
  †Aviculopinna peracuta – tentative report
   †Aysheaia
caption: Assemblage of fossils of the Cambrian trilobite Agnostus
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