This list of the Paleozoic life of Iowa contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Iowa and are between 538.8 and 252.17 million years of age.

A

†Abatocrinus †Acidaspis †Aclisina †Actinocrinites †Actinocrinites gibsoni †Actinocrinites jugosus †Actinocrinites lowei †Actinocrinites pernodosus †Actinocrinites probolos †Actinopteria – tentative report †Actinostroma †Actinostroma clathratum †Acutatheca †Acutatheca propira †Adocetocystis †Adolfia †Aechmina †Aechmina cuspidata †Aechmina ionensis †Aechmina maquiketensis †Aechmina taurea †Agassizodus †Agassizodus variabilis †Agelacrinites †Aglaocrinus †Aglaocrinus compactus †Allanella †Allanella allani †Allanella annae †Allanella cardinalis †Allenella †Allenella allani †Allenella annae †Allocrinus †Allocrinus ornatus †Allocrinus subglobosus †Allorhynchus †Allorhynchus currei – or unidentified comparable form †Allozygocrinus †Allozygocrinus dubuquensis †Alveolites †Ambocoelia †Ambocoelia louisianaensis †Ambocoelia minuta †Ambonychia †Americoncha †Americoncha marginata †Amphicoelia †Amphicyrtoceras †Amphipora †Amphipora pervesiculata †Amplexus †Anartiocystis †Anastrophia †Anataphrus †Anematina †Anematina conica †Angyomphalus †Angyomphalus lens †Angyomphalus penelenticulata – type locality for species †Anisotrypa †Anomphalus †Anthracospirifer †Anthracospirifer pellaensis †Antiquatonia †Antirhynchonella †Antirotella †Antirotella kindlei – type locality for species †Aorocrinus †Aparchites †Aparchites barbatus †Aparchites carinatus †Aparchites chatfieldensis †Aparchites ellipticus †Aparchites fimbriatus †Aparchites macrus †Aparchites paratumida †Aphelecrinus †Apycnodiscus †Arabellites †Arachnophyllum †Archaeocalyptocrininus †Archaeocalyptocrininus iowensis †Archaeocalyptocrininus nodosus †Archaeocalyptocrinus †Archaeocalyptocrinus iowensis †Archaeocalyptocrinus nodosus †Archaeocrinus †Archaeocrinus obconicus †Archaeogastropod †Archinacella †Archinacella rotunda †Arctinurus †Arctomeristina †Arisaigia †Arrectocrinus †Arrectocrinus iowensis †Arthroxylon †Asphaltinella †Asterophyllites †Asterophyllites multifolia †Asthenophyllum †Astraeospongium †Astreptodictya †Astrocystites †Astrocystites ottawaensis – tentative report †Atelodictyon †Atelodictyon masoncityense – type locality for species †Athyris †Athyris cedarensis †Athyris crassicardinalis †Athyris fultonensis – or unidentified comparable form †Athyris simplex †Athyris spiriferiodes †Athyris vitatta †Athyris vittata †Athyris zonulata †Atribonium †Atribonium nora †Atribonium paupera †Atribonium prolifica †Atribonium subovata †Atribonium swallovi †Atrypa †Atrypa reticularis †Atrypa reticularus †Atryparia †Atryparia varicostata †Atrypoidea †Aulacella †Aulocopella †Aulocopella dactylos – type locality for species †Aulocopella probolos – type locality for species †Aulocopella scelidos – type locality for species †Aviculopecten †Aviculopecten marbuti – or unidentified comparable form

B

Bairdia †Bairdiocypris †Bairdiocypris granti †Bairdocypris †Bairdocypris granti †Basseleratia †Basseleratia typa †Bassleratia †Bassleratia typa †Batostomella †Baylea †Baylea trifibra – type locality for species †Beecheria †Beecheria chouteauensis †Belemnocrinus †Bellerophon †Bellerophon blairi †Bellerophon panneus †Bellerophon patersoni †Bellerophon vinculatus †Bellornatia †Bellornatia tricollis †Belodina †Belodina compressa †Beloitoceras – tentative report †Beloitoceras discrepana †Bembexia †Bembexia minima †Bensbergia †Bensbergia pulchra – type locality for species †Beyrichia †Beyrichia irregularis †Bighornia †Blothrocrinus †Bobbodus †Bobbodus schaefferi †Bolicrinus †Bolicrinus deflatus †Bolicrinus globosus †Bollia †Bollia regularis †Bollia ruthae †Bollia subaequata †Bothriocidaris †Bothriocidaris maquoketensis †Botryocrinus †Botryocrinus thomasi – type locality for species †Brachythyris †Brachythyris burlingtonensis – or unidentified comparable form †Brachythyris chouteauensis †Brachythyris peculiaris †Brachytomaria †Brachytomaria semele †Breviphillipsia †Brockocystis †Brockocystis nodosaria †Bromidella †Bromidella depressa †Bromidella rhomboides †Bryantodina †Bryantodina typicalis †Bucanella †Bucanella conradi †Bucanopsis †Bucanopsis lirata †Bullatekka †Bullatekka granilabiatus †Bullatella †Bullatella granilabiatus †Bumastus †Buranella †Buxtonia – tentative report †Byrsolopsina †Byrsolopsina centipunctata †Byrsolopsina normella †Byrsolopsina ovata †Byrsolopsina planilateralis Bythocypris †Bythocypris curta †Bythocypris furnishi

C

†Caenanoplia †Caenanoplia logani †Calamocarpon †Calamocarpon insignis †Calceocrinus †Calceocrinus levorsoni †Calcisphaera †Calcisphaera laevis †Calliocrinus †Calliocrinus longispinus †Callocrinus †Callocrinus longispinus †Callocystites †Calvinaria †Calvinaria ambigua †Calvinaria bransoni †Calvustrigis – tentative report †Calymene †Camarophorella †Camarophorella lenticularis †Camarotoechia †Camarotoechia chemungensis †Camarotoechia chouteauensis †Camarotoechia crassiplicata †Camarotoechia perplexa †Camarotoechia quadricostatum †Camarotoechia saxatilis †Camarotoechia saxatillis †Camarotoechia tuta †Camerella †Carabocrinus †Carabocrinus radiatus †Carabocrinus slocomi †Cardiola †Cardiola lyoni †Carinatrypa †Carinatrypa dysmorphstrota †Cariniferella †Cariniferella iowensis †Carpocrinus †Carpocrinus bodei †Caryocrinites †Catenipora †Ceratocephala †Ceratopsis †Ceratopsis humilinoda †Ceratopsis quadrifida †Ceratopsis trilobis †Ceraurus †Cerithioides †Cerithioides judiae †Characterophyllum †Characterophyllum nanum †Charactoceras †Charactophyllum †Charactophyllum nanum †Charionella †Charionella nortoni †Cheirurus †Chomatodus †Chomatodus inconstans †Chonetes †Chonetes glenparkensis †Chonetes illinoisensis †Chonetes logani †Chonetes multicosta †Chonetes multicostata †Chonetes ornatus †Chonetina †Chonetinella †Chonetipustula †Chonetipustula concentrica †Chonopectus †Chonopectus fischeri †Chonophyllum †Clathrocoilona †Clathrocoilona involuta – type locality for species †Clathrodictyon †Cleiocrinus †Cleiocrinus regius †Cleiothyridina †Cleiothyridina crassicardinalis – or unidentified related form †Cleiothyridina glenparkensis – or unidentified comparable form †Cleiothyridina incrassata – or unidentified comparable form †Cleiothyridina sublamellosa †Climacoconus †Climacoconus pumilus †Climacograptus †Climacograptus pumilis †Climacograptus typicalis †Clinolithes †Clinopistha †Clintonella – tentative report †Clorinda †Cochliodus †Cochliodus occidentalis †Coelospira †Coeloterorhynchus †Coeloterorhynchus schucherti †Coeloterorhynchus subacuminata †Coeloterorhynchus subacuminatus †Coenites †Composita †Composita humilis – tentative report †Composita immatura – or unidentified comparable form †Composita trinuclea †Compsocrinus †Concavicaris †Concavicaris sinuata – or unidentified comparable form †Conocardium †Conotreta †Conularia †Coolinia †Cornulites †Costistricklandia †Costistricklandia castellana †Costistricklandia multilirata †Cotylacrina †Cotylacrina sandra †Cranaena †Cranaena amana †Cranaena arcuosa †Cranaena calvini †Cranaena depressa †Cranaena elia †Cranaena famelica †Cranaena inflata †Cranaena infrequens †Cranaena iowensis †Cranaena jacunda †Cranaena lata †Cranaena littleonensis †Cranaena littletonensis †Cranaena maculata †Cranaena marsii †Cranaena micula †Cranaena navicella †Cranaena occidentalis †Cranaena pachytesta †Cranaena parvirostra †Cranaena rhomboidialis †Cranaena rockfordensis †Cranaena romingeri †Cranaena seminula †Cranaena subcylindrica †Cranaena subglobosa †Cranaena subglossa †Cranaena subgobulosa †Cranaena subouata †Cranaena subovata †Cranaena thomasi †Cranaenella †Crania †Crania famelica †Crassiproetus †Crassiproetus arietinus †Crassiproetus bumastoides †Crassiproetus occidens †Crassiproetus searighti †Cremacrinus †Cremacrinus gerki †Cremacrinus guttenbergensis †Cremacrinus punctatus – or unidentified related form †Cremacrinus type locality for species – informal †Cribanocrinus †Crotalocrinintes †Crotalocrinites †Crurithyris †Cryptophyllus †Cryptophyllus oboloides †Cryptophyllus sulcatus †Ctenobolbina †Ctenobolbina emaciata †Ctenobolbina maquoketensis †Ctenodonta †Ctenodonta anatina †Ctenodonta calvini †Cupularostrum †Cupularostrum contracta †Cupularostrum saxatilis †Cupularostrum saxatillis †Cupulocorona †Cupulocrinus †Cupulocrinus angustatus †Cupulocrinus conjugans – or unidentified related form †Cupulocrinus crossmani †Cupulocrinus latibrachiatus – or unidentified related form †Curtognathus †Cusacrinus †Cyathaxonia †Cyathaxonia arcuatus †Cyathocrinites †Cyathocrintes †Cyathocrintes striatissimus – or unidentified comparable form †Cyathophyllum †Cyclocrinites †Cyclocrinites dactilioides †Cyclocrinites dactioloides †Cyclocystoides †Cyclonema †Cyclonema bilix †Cyclonema minuta †Cyclora †Cynopodius †Cyphaspis †Cypricardella †Cypricardinia †Cypricardinia sulcifera †Cyrtia †Cyrtia exporrecta †Cyrtina †Cyrtina inulta †Cyrtina iowaensis †Cyrtina triquetra †Cyrtina umbonata †Cyrtodonta †Cyrtolites †Cyrtospira †Cyrtospirifer †Cyrtospirifer disjunctus †Cyrtospirifer whitneyi †Cystiphyllum †Cystiphyllum mundulum †Cystodictya †Cytocrinus

D

†Dalejina †Dalmanella †Dalmanella edgewoodensis – or unidentified comparable form †Dalmanites †Dapsilodus †Dapsilodus mutatus †Dawsonoceras †Decadocrinus †Decadocrinus crassidactylus – type locality for species †Decadocrinus pachydactylus – type locality for species †Decadocrinus spinulifer – type locality for species †Decaschisma †Dechenella †Dechenella haldemani – or unidentified comparable form †Dechenella nortoni †Dechenella prouti †Dechenella rowi – or unidentified comparable form †Deiphon †Delocrinus †Delocrinus vulgatus †Deltaherpeton – type locality for genus †Deltaherpeton hiemstrae – type locality for species †Delthyris – tentative report †Deltodus †Deltodus spatulatus †Dendrocrinus †Dendrocrinus casei †Dendrocrinus curvijunctus – or unidentified related form †Dendrocrinus oswegoensis †Dentalium †Dentalium grandaevum †Derbyia †Desquamatia †Desquamatia brandonensis †Desquamatia independensis †Desquamatia randalia †Desquamatia rotunda †Desquamatia rusica †Desquamatia scutiformis †Desquamatia waterlooensis †Devonatrypa †Devonatrypa brandonensis †Devonatrypa pronis †Devonatrypa trowbridgei †Devonatrypa waterlooensis †Devonochonetes †Devonochonetes calivini †Devonoproductus †Devonoproductus reticulocostus †Devonoproductus vulgaris †Devonoproductus walcotti †Diamphidiocystis †Diceromyonia †Dichacaenia †Dichacaenia harberti †Dichocrinus †Dicoelosia †Dicranella †Dicranella bicornis †Dicranella marginata †Dicranella simplex †Dicranella spinosa †Dicranella typa †Dicranopeltis †Dictyoclostus †Dictyotomaria †Dictyotomaria quasicapillaria – type locality for species †Dielasma †Dielasma burlingtonensis †Dielasma chouteauensis †Dielasma formosum †Dimerocrinites †Dimerocrinites hopkintonensis †Dimerocrinites pentangularis †Dimerocrinites sculptus †Dinobolus †Dinolobus †Dinorthis †Diopatraites †Diphyphyllum †Diploblastus †Diploblastus glaber †Diplograptus †Diplograptus modestus – or unidentified comparable form †Diplophyllum †Diplosphaerina †Diplosphaerina inaequalis †Discosorus †Disphyllum †Disphyllum conjugans – type locality for species †Disphyllum dispassum †Disphyllum floydense †Disphyllum iowensis – type locality for species †Disphyllum tubiforme †Dolerorthis †Donaldina – tentative report †Dorycrinus †Dorycrinus gouldi