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 538.8 and 252.17 million years of age.
A
†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 for species †Apographiocrinus †Apographiocrinus typicalis †Archaeocalamites †Archaeocalamites radiatus †Archaeocalyptocrinus †Archaeocalyptocrinus obconicus †Archaeocidaris – tentative report †Archaeologus – type locality for genus †Archaeologus falcatus – type locality for species †Archaeopteris †Archaeopteris stricta †Archimedes †Archimedes communis †Archimedes compactus †Archimedes invaginatus †Archimedes lativolvis †Archimedes macfarlani †Archimedes swallovanus †Archimedes terebriformis †Archimylacris †Archimylacris paucinervis – type locality for species †Archisymplectes – type locality for genus †Archisymplectes rhothon – type locality for species †Architarbus – type locality for genus †Architarbus minor – type locality for species †Architarbus rotundatus – type locality for species †Archiulus – tentative report †Archiulus glomeratus – type locality for species †Archoblattina – type locality for genus †Archoblattina beecheri – type locality for species †Archoblattina scudderi – type locality for species †Arctinurus †Arctinurus boltoni †Arctinurus chicagoensis †Argentiproductus †Argentiproductus auriculatus †Arthrolycosa – type locality for genus †Arthrolycosa antiqua – type locality for species †Arthrolycosa danielsi – type locality for species †Arthropitys †Arthropitys communis †Artisia †Artisia transversa †Asemoblatta †Asemoblatta danielsi – type locality for species †Asemoblatta mazona – type locality for species †Asinomphalus †Asinomphalus antiqua †Asolanus †Asolanus camptotaenia †Astartella †Astartella compacta †Astartella concentrica †Asterophyllites †Asterophyllites equisetiformis – or unidentified comparable form †Asterophyllites longifolius †Asterophyllites multifolia †Asterotheca †Asterotheca miltoni – or unidentified comparable form †Astraeospongium †Asyncritus – type locality for genus †Asyncritus reticulatus – type locality for species †Athyris †Athyris vittata †Atrypa †Atrypa putilla †Atrypa reticularis – report made of unidentified related form or using admittedly obsolete nomenclature †Aulacotheca †Aulertupus – type locality for genus †Aulertupus tembrocki – type locality for species †Aviculopecten †Aviculopecten fasciculatus † Avonia †Avonia pyidata †Axiodeaneia †Axiodeaneia glenparkensis †Axiologus – type locality for genus †Axiologus thoracicus – type locality for species
B
†Balteosporites †Balteosporites minutus †Bandringa – type locality for genus †Bandringa herdinae – type locality for species †Bandringa rayi – type locality for species †Bassleroceras †Bassleroceras lasallense †Baylea †Baylea minuta – type locality for species †Baylea sinuatus – type locality for species †Baylea subconstricta – type locality for species †Beecheria †Beecheria illinoisense †Beecheria paraplicata †Belemnospongia †Belemnospongia parmula †Bellerophon †Bellerophon chesterensis – type locality for species †Bellerophon incomptus – type locality for species †Bellerophon spergensis †Bellerophon stevensianus †Bellerophon tenuilineata – type locality for species †Belinurus †Belinurus lacoei – type locality for species †Bembexia †Bembexia gradilispira – type locality for species †Beyrichiella †Beyrichiella confluens †Bicarina †Bicarina petilitornata †Bighornia †Bighornia patella – or unidentified comparable form †Bizarrea – type locality for genus †Bizarrea obscura – type locality for species †Blattoidea †Blattoidea anceps – type locality for species †Blattoidea carri – type locality for species †Blattoidea melanderi †Blattoidea schuchertiana – type locality for species †Blattoidea sellardsiana – type locality for species †Brabeocrinus – type locality for genus †Brabeocrinus christinae – type locality for species †Brachycycloceras †Brachycycloceras normale †Brachydectes †Brachydectes newberryi †Brachythyris †Brachythyris hortonensis †Brevilamnulella – tentative report †Brevilamnulella thebesensis †Bucania †Bucania batchtownensis – type locality for species †Bulimorpha †Bulimorpha minor †Bulimorpha whitfieldi – type locality for species †Bumastoides †Bumastoides billingsi †Bumastus †Bumastus armata †Bumastus armatus – or unidentified comparable form †Bumastus chicagoensis †Bumastus cuniculus – or unidentified comparable form †Bumastus graftonensis †Bumastus insignis †Bumastus springfieldensis †Bumastus transversalis †Buthiscorpius †Buthiscorpius lemayi – type locality for species
C
†Cacurgus – type locality for genus †Cacurgus spilopterus – type locality for species †Cadiospora †Cadiospora fithiana †Cadiospora magna †Calamites †Calamites cistiiformis – or unidentified comparable form †Calamites rectangularis †Calamites suckowii †Calamocarpon †Calamocarpon insignis †Calamodendron †Calamodendron americanum †Calamospora †Calamospora breviradiata †Calamospora flava †Calamospora flexilis †Calamospora hartungiana †Calamospora liquida †Calamospora minuta †Calamospora mutabilis †Calamospora pedata †Calamospora straminea †Calamostachys †Calamostachys americana †Calamostachys andanensis †Calamostachys inversibractis – type locality for species †Calceocrinus †Calliasterella †Calliasterella americana †Calliocrinus †Calliocrinus cornatus †Calliocrinus cornutus †Calliocrinus pentangularis †Callipteridium †Calvinia †Calvinia edgewoodensis †Calymene †Calymene breviceps †Calymene celebra †Calyptaulax †Calyptaulax callicephala †Camarophorella †Camarophorella buckleyi – or unidentified comparable form †Camarotoechia †Camerella †Camptotriletes †Camptotriletes bucculentus †Camptotriletes triangularis †Cancrinella †Cancrinella boonensis †Cannophyllites †Cannophyllites abbreviata †Cannophyllites dawsoni †Cannophyllites fasciculata †Cannophyllites marginata †Cannophyllites rectinervis †Cannophyllites southwelli †Carbonocoryphe †Carbonocoryphe planucauda †Carbonympha – type locality for genus †Carbonympha herdinai – type locality for species †Cardiocarpon †Cardiopteridium †Cardiothyris †Cardiothyris pristina †Carpocrinus †Caryocrinites †Caryocrinites ornatus – or unidentified comparable form †Caseodus †Caseodus basalis – type locality for species †Catadyesthus †Catadyesthus priscus †Caulopteris †Cephalerpeton – type locality for genus †Cephalerpeton ventriarmatum – type locality for species †Ceratiocaris †Ceratiocaris markhami †Ceratocephala †Ceratocephala goniata †Ceraurinella †Ceraurinella tenuisculptus †Ceraurinus †Ceraurinus platycanthus †Cerauromerus †Cerauromerus hydei †Ceraurus †Ceraurus globulobatus †Ceraurus pleurexanthemus †Cervifurca †Cervifurca nasuta †Chaenomya †Chaetetes †Cheirurus †Cheirurus niagarensis – or unidentified comparable form †Cheirurus patens †Cheliphlebia – type locality for genus †Cheliphlebia carbonaria – type locality for species †Cheliphlebia mazona – type locality for species †Chenilleophycus †Chenilleophycus godfreyensis †Chicagocrinus †Chicagocrinus ornatus †Chirodus †Chirodus orbicularis †Chlidonocrinus †Chlidonocrinus erectus – type locality for species †Chlidophorus †Chonetes †Chonetes ornatus †Chonetinella †Chrestotella †Chrestotella danae – type locality for species †Chrestotes – type locality for genus †Chrestotes lapidea – type locality for species †Cirratriradites †Cirratriradites annulatus †Cirratriradites annuliformis †Cirratriradites tenuis †Clathrocrinus – type locality for genus