page_title: List of the Paleozoic life of Kansas
section_title: O
hierarchical_section_title: List of the Paleozoic life of Kansas / O
caption_attribution_description: English: Crop of file in filename
context_page_description: This list of the Paleozoic life of Kansas contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Kansas and are between 541 and 252.17 million years of age.
context_section_description: †Odonopteris
  †Odonopteris minor
  †Odontopteris
  †Odontopteris brardii
  †Odontopteris excelsa
  †Oligotypus – type locality for genus
  †Oligotypus tillyardi – type locality for species
  †Omphalotrochus
  †Omphalotrochus obtusispira
  †Omphalotrochus wolfcampensis
   †Ophiacodon – type locality for genus
  †Ophiacodon hilli – type locality for species
  †Opisthocladus – type locality for genus
  †Opisthocladus arcuatus – type locality for species
  †Opisthocladus strictus – type locality for species
  †Opter – type locality for genus
  †Opter brongniartii – type locality for species
  †Orbiculoidea
  †Orbiculoidea capuliformis
  †Orbiculoidea missouriensis
  †Orbiculoidea tenulineata – or unidentified comparable form
   †Orodus
  †Orthacanthus
  †Orthomyalina
  †Orthomyalina slocomi
  †Orthomyalina subquadrata
  †Orthopsocus – type locality for genus
  †Orthopsocus singularis – type locality for species
  †Osagia –
caption: Life restoration of the Carboniferous-Permian synapsid (mammal precursor) Ophiacodon
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