page_title: List of the Paleozoic life of Nevada
section_title: O
hierarchical_section_title: List of the Paleozoic life of Nevada / O
caption_attribution_description: English: Crop of file in filename
context_page_description: This list of the Paleozoic life of Nevada contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Nevada and are between 541 and 252.17 million years of age.
context_section_description: †Obolella
  †Obolus
  †Odontospirifer
  †Odontospirifer type locality for species A – informal
  †Oepikina
  †Ogygopsis
  †Ogygopsis batis
  †Ogygopsis typicalis
  †Oistodus
  †Oistodus contractus
  †Oistodus lanceolatus – or unidentified comparable form
  †Oklahomacrinus
  †Oklahomacrinus triangulus
  †Olenaspella
  †Olenaspella paucisegmenta
  †Olenaspella regularis
  †Olenaspella separata – type locality for species
     †Olenellus
  †Olenellus chiefensis – type locality for species
  †Olenellus clarki
  †Olenellus fowleri – type locality for species
  †Olenellus fremonti – or unidentified comparable form
  †Olenellus gilberti
  †Olenellus howelli
  †Olenellus multinodus
  †Olenellus puertoblancoensis – tentative report
  †Olenellus terminatus – type locality for species
   †Olenoides
  †Olenoides maladensis
  †Olenoides steptoensis – type locality for species
  †Olenus
  †Olenus wilsoni
  †Oligometopus
  †Oligometopus contractus
  †Ollenellus
  †Ollenellus gilberti
  †Omphalocirrus – tentative report
  †Omphalotrochus
  †Onchocephalites
  †Onchocephalites claytonensis – type locality for species
  †Onchocephalus
  †Onchocephalus maior – or unidentified comparable form
  †Onchocephalus major – or unidentified comparable form
  †Onchocephalus palupus – type locality for species
  †Oncochilus
  †Onuphlonella – tentative report
  †Onychoplecia – tentative report
  †Ophioxenikos
  †Ophioxenikos langenheimi
  †Opikina
  †Opipeuter
  †Opisthotreta
  †Opisthotreta indistincta – type locality for species
  †Opisthotreta transversa – type locality for species
  †Opsiosoryctocephalus – type locality for genus
  †Opsiosoryctocephalus ophis – type locality for species
  †Orbiculoidea
  †Orbiculoidea capuliformis
  †Orbiculoidea missouriensis
  †Orbiculoidea moorefieldana – or unidentified related form
  †Orecopia
  †Orecopia mccoyi
  †Oriostoma
  †Oriostoma gerbaulti
  †Oriskania
  †Orthambonites
  †Orthambonites bifurcatus
  †Orthambonites decipiens – or unidentified comparable form
  †Orthambonites dinorthoides
  †Orthambonites eucharis
  †Orthambonites mazourkaensis – or unidentified comparable form
  †Orthambonites minisculus
  †Orthambonites minusculus
  †Orthambonites patulus
  †Orthambonites paucicostatus
  †Orthambonites subulata
  †Orthidiella
  †Orthidiella carinata
  †Orthidiella costellata
  †Orthidiella extensa
  †Orthidiella longwelli
  †Orthidium
  †Orthidium bellulum
  †Orthidium fimbriatum – or unidentified related form
  †Orthis
  †Orthoceras
  †Orthograptus
  †Orthograptus calcaratus
  †Orthograptus truncatus
  †Orthonema
  †Orthonychia
  †Orthonychia occidens
  †Orthoretiolites
  †Orthoretiolites hami
  †Orthostrophella
  †Orthostrophella monitorensis – type locality for species
  †Orthostrophia
  †Orthotetes
  †Orthotetes kaskaskiensis
  †Orthotetes occidentalis
  †Orthotichia – tentative report
  †Orthovertella
  †Orulgania
  †Oryctocephalina
  †Oryctocephalina maladensis – tentative report
  †Oryctocephalites
  †Oryctocephalites claytonensis – type locality for species
  †Oryctocephalites palmeri
  †Oryctocephalites rasettii
  †Oryctocephalites runcinatus
  †Oryctocephalites typicalis
  †Oryctocephalus
  †Oryctocephalus americanus – type locality for species
  †Oryctocephalus indicus
  †Oryctocephalus maladensis
  †Oryctocephalus nyensis
  †Oryctocephalus orientalis
  †Oryctocephalus primus
  †Otarion
     †Ottoia
  †Ottoseetaxis
  †Oulodus
  †Oulodus rohneri
  †Oulodus ulrichi
  †Ovatia
  †Ovatia latior – or unidentified comparable form
  †Ovatia nodosa
  †Ovatoryctocara – tentative report
  †Oxoplecia
  †Oxoplecia monitorensis
  †Oxoplecia nevadensis
  †Oxyspira – type locality for genus
  †Oxyspira murphyi – type locality for species
  †Ozarkodina
  †Ozarkodina hassi
  †Ozarkodina oldhamensis – tentative report
  †Ozarkodina raaschi
  †Ozarkodina tenuis – or unidentified comparable form
caption: Illustration of fossils of the Cambrian brachiopod Obolella
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