page_title: List of the Paleozoic life of Illinois
section_title: A
hierarchical_section_title: List of the Paleozoic life of Illinois / A
caption_attribution_description: Alethopteris. Exhibit Museum of Natural History, University of Michigan, 1109 Geddes Avenue, Ann Arbor, Michigan, USA.
context_page_description: This list of the Paleozoic life of Illinois contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Illinois and are between 541 and 252.17 million years of age.
context_section_description: †Acantherpestes
  †Acantherpestes inequalis – type locality for species
  †Acantherpestes major – type locality for species
  †Acanthoparypha
  †Acanthoparypha subcircularis
  †Acanthopecten
  †Acanthopecten carboniferus
  †Acanthotriletes
  †Acanthotriletes aculeolatus
  †Acanthotriletes dimorphus
  †Achatella
  †Achatella katharina
  †Acrocrinus
  †Acrocrinus constrictus
  †Actinoceras
  †Actinopteria
  †Actinopteria boydi
  †Adeloblatta
  †Adeloblatta columbiana – type locality for species
  †Adeloblatta sellardsi
  †Adeloneura – type locality for genus
  †Adeloneura thompsoni – type locality for species
  †Adiaphtharsia – type locality for genus
  †Adiaphtharsia ferrea – type locality for species
  †Adiphlebia – type locality for genus
  †Adiphlebia lacoana – type locality for species
  †Adolarryia – type locality for genus
  †Adolarryia bairdi – type locality for species
  †Aenigmatodes – type locality for genus
  †Aenigmatodes danielsi – type locality for species
  †Aetophlebia – type locality for genus
  †Aetophlebia singularis – type locality for species
  †Agogoblattina
  †Agogoblattina occidua – type locality for species
  †Ahrenisporites
  †Ahrenisporites guerickei
  †Ahrensisporites
  †Ahrensisporites guerickei
  †Alanympha – type locality for genus
  †Alanympha richardsoni – type locality for species
  †Alatisporites
  †Alatisporites hexalatus
  †Alatisporites punctatus
  †Alatisporites trialatus
   †Alethopteris
  †Alethopteris decurrens
  †Alethopteris lonchitica
  †Alethopteris owenii
  †Alethopteris serlii
  †Allagecrinus
  †Allagecrinus mccraneyensis – type locality for species
  †Alloiopteris
  †Alloiopteris gracillima
  †Alloiopteris quercifolia – or unidentified comparable form
  †Alloiopteris sternbergi
  †Allosocrinus
  †Allosocrinus bronaughi
  †Amarixys
  †Amarixys gracilis – type locality for species
  †Amarixys stellaris – type locality for species
  †Amarixys sulcata – type locality for species
  †Amaurotoma
  †Amaurotoma leavenworthana
  †Ambocoelia
  †Ambocoelia louisianaensis
  †Ambocoelia minuta
  †Ambonychia – tentative report
  †Ametretus – type locality for genus
  †Ametretus laevis – type locality for species
  †Ameura
  †Amousus – type locality for genus
  †Amousus mazonus – type locality for species
   †Amphibamus – type locality for genus
  †Amphibamus grandiceps – type locality for species
  †Amphicoelia
  †Amphilichas
  †Amphilichas subdisjunctus
  †Amphiscapha
  †Amphiscapha subrugosa
  †Amplexizaphrentis
  †Amplexizaphrentis spinulosus
  †Amynilyspes – type locality for genus
  †Amynilyspes wortheni – type locality for species
  †Anaphragma
  †Anaphragma mirabile
  †Anapiculatisporites
  †Anapiculatisporites grundensis
  †Anapiculatisporites spinosus
  †Anastrophia
  †Anegertus – type locality for genus
  †Anegertus cubitalis – type locality for species
  †Anematina
  †Anematina proutana
  †Anepitedius – type locality for genus
  †Anepitedius giraffa – type locality for species
    †Annularia
  †Annularia asteris – or unidentified comparable form
  †Annularia cuspidata
  †Annularia stellata
  †Annularia vernensis – or unidentified comparable form
  †Anobasicrinus
  †Anobasicrinus brevis – type locality for species
  †Anomphalus – type locality for genus
  †Anomphalus rotulus – type locality for species
  †Anthracoceras
  †Anthracoceras wanlessi – type locality for species
  †Anthracophausia
  †Anthracophausia ingelsorum
  †Anthracoscorpio – tentative report
  †Anthracospirifer
  †Anthracospirifer leidyi
  †Anthracothremma – type locality for genus
  †Anthracothremma robusta – type locality for species
  †Anthrakoris – type locality for genus
  †Anthrakoris aetherius – type locality for species
  †Antiquatonia
  †Antiquatonia portlockianus – or unidentified comparable form
  †Antirhynchonella
  †Antirhynchonella ventricosa – or unidentified comparable form
  †Aphantomartus
  †Aphantomartus pustulatus – type locality for species
  †Apiculatasporites
  †Apiculatasporites latigranifer
  †Apiculatasporites setulosus
  †Apiculatasporites spinososaetosus
  †Apiculatasporites variocorneus
  †Apiculatasporites variusetosus
  †Apiculatisporites
  †Apiculatisporites abditus
  †Apiculatisporites frequentisporites
  †Apiculatisporites lappites
  †Apiculatisporites setulosus
  †Apithanus – type locality for genus
  †Apithanus jocularis – type locality f
caption: Fossilized fronds of the Carboniferous-Early Cretaceous seed fern Alethopteris
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