This list of the Paleozoic life of Arkansas contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Arkansas and are between 541 and 252.17 million years of age.
A
†Adnatoceras †Adnatoceras alaskense †Ahrensisporites †Ahrensisporites guerickei †Amphiscapha †Amphiscapha intermedius †Amphissites †Amphissites rugosus †Amplexizaphrentis †Amplexizaphrentis maneri – type locality for species †Amplexizaphretis †Amplexizaphretis maneri – type locality for species †Amplexus †Ananaspis †Anchicrinus †Anchicrinus planulatus †Ancillotoechia †Ancillotoechia marginata †Angyomphalus †Angyomphalus desultoria – type locality for species †Angyomphalus discus †Anomphalomorpha – report made of unidentified related form or using admittedly obsolete nomenclature †Anthracoceras †Anthracoceras paucilobum †Anthracomartus †Anthracomartus trilobitus – type locality for species †Anthracospirifer †Antiquatonia †Antirhynchonella †Antirhynchonella thomasi †Aphelaeceras †Aphelaeceras arkansanum – type locality for species †Aphralysia – tentative report †Apiculatasporites †Apiculatasporites variocorneus †Apotocardium †Apotocardium peculiare – type locality for species †Apotocardium polymitarium – type locality for species †Apotocardium snideri – tentative report †Arcanoceras †Arcanoceras furnishi – type locality for species †Archaeocidaris Archaeolithophyllum – tentative report †Archimastax †Archimastax americanus – type locality for species †Archimedes †Archimylacris †Archimylacris venusta – type locality for species †Arkacrinus †Arkacrinus dubius †Arkanites †Arkanites relictus †Arkoceras †Arkoceras exiguum †Asketomorpha – type locality for genus †Asketomorpha grandis – type locality for species †Asphaltina †Astartella †Astartella concentrica – or unidentified comparable form †Athyris †Atrypa †Atrypina †Atrypina erugata †Aviculopecten †Aviculopecten inspeciosus †Aviculopecten jennyi †Aviculopecten morrowensis †Aviculopecten squamula † Avonia †Avonia honeycreekensis †Axinolobus †Axinolobus modulus – type locality for species
B
†Bactrites †Bactrites carbonarius †Bactrites gaitherensis †Bactrites redactus †Bactrites smithianus †Bactritimimus †Bactritimimus girtyi – type locality for species †Bactritimimus ulrichi – type locality for species †Baiosoma †Baiosoma cucullata – type locality for species Bairdia †Bairdia girtyi †Barytichisma †Barytichisma clubinei †Barytichisma ozarkana †Baschkirites †Baschkirites librovitchi †Beecheria †Bellerophon †Bellerophon welshi †Bisatoceras †Bisatoceras secundum †Bistrialites †Bistrialites bicostatus – type locality for species †Boesites †Boesites scotti †Borestus †Boucotides †Boucotides barrandei †Brachycycloceras †Brachycycloceras washingtonense – type locality for species †Brachymimulus †Brachymimulus americanus †Brachymimulus elongatus †Brachythyris †Bradyphyllum †Bradyphyllum lesliense – type locality for species †Branneroceras †Branneroceras branneri †Bridgeites †Bridgeites planidorsalis – type locality for species †Buttsia †Buttsia drabensis †Buxtonia
C
†Cancelloceras †Cancelloceras hunstvillense – type locality for species †Cancelloceras huntsvillense – type locality for species †Caneyella †Caneyella peculiaris †Caneyella percostata †Caneyella wapanuckensis – or unidentified comparable form †Caninostrotion †Caninostrotion variabilis †Carcharopsis †Carcharopsis wortheni †Cardiomorpha – tentative report †Cardiomorpha inflata †Caryocrinites †Cavellina †Cavusgnathus †Centrotarphyceras †Centrotarphyceras yellvillense †Ceratopea †Ceratopea unguis †Cheilocephalus †Cheilocephalus brachyops †Cheirurus †Cheirurus phollikodes – type locality for species †Cheirurus prolixus – type locality for species †Choctawites †Choctawites choctawensis †Chonetes †Clathrospira †Clathrospira virguncula †Cleiothyridina †Cliffia †Cliffia lataegenae †Cluthoceras †Cluthoceras glicki – type locality for species †Clytoceras †Clytoceras capax †Coelogasteroceras †Coelogasteroceras gracile †Comanchia †Comanchia amplooculata †Composita †Compsonema †Convolutispora †Copiceras †Copiceras erectum †Cornuproetus †Cornuproetus kyphora – type locality for species †Cranaena †Crassispora †Crassispora kosankei †Cravenoceras †Cravenoceras lineolatum – type locality for species †Criboconcha †Cristatisporites †Cristatisporites connexus †Cristatisporites indignabundus †Cromyocrinus †Cromyocrinus grandis – type locality for species †Crurithyris †Crurithyris parva †Ctenobactrites †Ctenobactrites lesliensis – type locality for species †Cupulocorona †Cupulocorona gemmiformis †Cupulocorona osgoodensis †Cyclogranisporites †Cycloplectoceras †Cycloplectoceras funatum †Cycloplectoceras miseri †Cymoceras †Cymoceras cracens †Cymostrophia – report made of unidentified related form or using admittedly obsolete nomenclature †Cypricardella †Cypricardella subalata †Cypricardinia – tentative report †Cypricardinia fayettevillensis †Cyrtina
D
†Dalmanites – type locality for genus †Dalmanites bassleri †Dalmanites howelli †Dalmanites ptyktorhion – type locality for species †Decoroproetus †Decoroproetus anaglyptus – type locality for species †Decoroproetus corycoeus †Deiphon †Deiphon longifrons †Dellea †Dellea suada †Delops †Densosporites †Densosporites annulatus †Densosporites irregularis †Densosporites sphaerotriangularis †Densosporites triangularis †Dentoceras †Dentoceras belemnitiforme – type locality for species †Desmoinesia †Diaboloceras †Diaboloceras neumeieri – type locality for species †Diaboloceras varicostatum †Diacalymene †Diacalymene altirostris †Diacamaropsis †Diacamaropsis parva †Diaphragmus †Dicamaropsis †Dicamaropsis parva †Dicoelosia †Dicoelosia bilobella †Dielasma †Dinocycloceras †Dinocycloceras ballianum – or unidentified comparable form †Dinocycloceras prolixum †Diphuicrinus †Diphuicrinus croneisi †Dolerorthis – tentative report †Dolerorthis nanella †Dolorthoceras †Dolorthoceras caneyanum – or unidentified comparable form †Dolorthoceras incisum – type locality for species †Dolorthoceras tenuifilosum – type locality for species
E
†Echinaria †Echinoconchus †Economolopsis – type locality for genus †Economolopsis gordoni – type locality for species †Ectogrammysia – type locality for genus †Ectogrammysia crassatis – type locality for species †Edmondia †Edmondia equilateralis †Edmooroceras †Edmooroceras plummeri †Encrinurus †Encrinurus egani †Endolobus †Endolobus clorensis †Eoasianites †Eoasianites smithwickensis †Eophacops †Eophacops fontana – type locality for species †Eopteria †Eopteria richardsoni †Eospirifer †Eospirifer acutolineatus †Eowellerites †Eowellerites discoidalis – type locality for species †Eowellerites moorei – or unidentified comparable form †Ephippioceras †Ephippioceras ferratum †Epistroboceras †Epistroboceras lesliense – type locality for species †Epistroboceras mangeri – type locality for species †Epistroboceras pitkinense – type locality for species †Eucalyptocrinites †Euchondria †Euconospira †Euconospira desereti – or unidentified related form †Euconospira disjuncta †Euloxoceras †Euloxoceras angustius – type locality for species †Euloxoceras greenei †Eumetria †Eumorphoceras †Eumorphoceras bisulcatum †Eumorphoceras milleri – type locality for species †Eumorphoceras ornatissimum – or unidentified comparable form †Euomphalus †Euomphalus konobasis – type locality for species †Euomphalus variabilis – type locality for species †Eupachycrinus †Eupachycrinus magister – or unidentified comparable form †Euphemites †Euphemites chesterensis – type locality for species †Euphemites whirligigi – type locality for species
F
†Fayettevillea †Fayettevillea planorbis – type locality for species †Florinites †Florinites similis †Florinites volans
G
†Garwoodia – tentative report †Gastrioceras †Gastrioceras adaense †Gastrioceras fittsi †Gastrioceras formosum – type locality for species Gastrochaenolites †Gastrochaenolites anauchen †Gattendorfia †Geisina – tentative report †Geisina retiferiformis †Girtyoceras †Girtyoceras welleri – type locality for species †Girtyspira †Girtyspira microspirula – type locality for species †Girvanella †Glabrocingulum †Glabrocingulum binodosum †Glabrocingulum coronulum – type locality for species †Glabrocingulum parasolum – type locality for species †Glabrocingulum parvanodum – type locality for species †Glabrocingulum quadrigatum †Glaphyrites †Glaphyrites depressus †Glaphyrites fayettevillae – type locality for species †Glaphyrites morrowensis †Globozyga †Globozyga mediocris – type locality for species †Glyphiolobus †Glyptambon – type locality for genus †Glyptambon verrucosus †Glyptopleura †Glyptopleura angulata †Glyptopleura inopinata †Gnathodus †Gnathodus texanus †Goniatites †Goniatites crenistria – or unidentified related form †Goniatites granosus †Goniatites multiliratus †Gordonites †Gordonites filifer †Gordonites matheri †Granulatisporites †Granulatisporites adnatoides †Graphiadactyllis †Graphiadactyllis arkansana †Graphiadactyllis fayettevillensis
H
†Haplistion †Haplistion sphaericum †Harpidella †Harpidella butorus – type locality for species †Harpidella spinulocervix †Healdia †Hematites †Hematites barbarae †Holocystites †Holocystites alternatus †Homoceratoides †Homoceratoides cracens †Homoeospirella †Homoeospirella costatula †Homoeospirella pygmaea †Hormotoma †Hormotoma anna †Hormotoma artemesia – type locality for species †Housia †Housia vacuna †Howellella †Howellella splendens †Hudsonoceras †Hudsonoceras moorei †Hustedia †Hydreionocrinus †Hypotetragona – tentative report
I
†Imitoceras †Imitoceras sinuatum – type locality for species †Imoella – type locality for genus †Imoella obscura – type locality for species †Imogloba †Imogloba gandyensis †Imonautilus – type locality for genus †Imonautilus meeki – type locality for species †Incisurella †Incisurella prima †Inflatia †Inflatia clydensis †Irvingella †Irvingella major
J
†Janthimorpha – report made of unidentified related form or using admittedly obsolete nomenclature †Jasperoceras †Jasperoceras costatum
K
†Kaskia †Kaskia chesterensis †Kazakhstania – tentative report †Kindbladia †Kindbladia wichitaensis †Kinkaidia †Kinkaidia trigonalis †Kirkbya †Kirkbya reflexa †Kirkbyella †Kirkbyella quadrata †Knightoceras †Knightoceras oxylobatum – type locality for species †Knightoceras patulum †Knoxisporites †Knoxisporites triradiatus †Kozlowskiellina †Kozlowskiellina vaningeni †Krotovia
L
†Laevigatosporites †Laevigatosporites desmoinesensis †Laevigatosporites vulgaris †Lasanocrinus †Lasanocrinus strigosus †Leangella †Leangella dissiticostella †Leonardophyllum †Leonardophyllum arkansanum †Lepdioproetus †Lepdioproetus xeo – type locality for species †Leptaena †Leptagonia †Leptocyrtoceras †Leptocyrtoceras curvatum †Leptocyrtoceras powellense †Leptodesma †Limipecten †Lingula †Linoproductus †Liroceras – tentative report †Lissatrypa †Lissatrypa clairensis †Lissostrophia †Lophamplexus – tentative report †Lophophyllidium †Lophophyllidium imoense – type locality for species †Lophotriletes †Lophotriletes microsaetosus †Lusitanites †Lusitanites subcircularis †Lycospora †Lycospora micropapillata †Lycospora pellucida †Lygdozoon – type locality for genus †Lygdozoon anoplos – type locality for species †Lygdozoon arkansanum †Lygdozoon collatum – type locality for species †Lysocystites – or unidentified related form
M
†Macropotamorhynchus †Macropotamorhynchus chouteauensis †Macropotamorhynchus tuta †Macrostylocrinus †Magnumbonella †Mammoides †Mariceras †Marmolatella †Marmolatella imoensis – type locality for species