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.

Contents

• A
• B
• C
• D
• E
• F
• G
• H
• I
• J
• K
• L
• M
• N
• O
• P
• Q
• R
• S
• T
• U
• V
• W
• X
• Y
• Z
• References

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
  • † Marmolatella macgordoni – type locality for species
• † Meekospira
  • † Meekospira minuta
• † Megaglossoceras
  • † Megaglossoceras glicki – type locality for species
• † Megapronorites
  • † Megapronorites baconi
• † Meristina
  • † Meristina clairensis

• 

  † Metacoceras
• † Metacromyocrinus
  • † Metacromyocrinus gillumi
• † Metadimorphoceras
  • † Metadimorphoceras subdivisum
• † Metutharocrinus
  • † Metutharocrinus cockei – type locality for species
• † Michelinia
  • † Michelinia macerimuris – type locality for species
  • † Michelinia meekana
  • † Michelinia tenuicula
• † Michelinoceras
  • † Michelinoceras wapanuckense
• † Microcheilinella – tentative report
• † Mitorthoceras
  • † Mitorthoceras crebriliratum
  • † Mitorthoceras girtyi – type locality for species
  • † Mitorthoceras perfilosum
  • † Mitorthoceras yellvillense – type locality for species
• † Monoceratina
• † Mooreoceras
  • † Mooreoceras wedingtonianum – type locality for species
• † Mourlonia
  • † Mourlonia lativittata
• † Muensteroceras
  • † Muensteroceras arkansanum – type locality for species
  • † Muensteroceras collinsoni – type locality for species
  • † Muensteroceras pisiforme – type locality for species
• † Multithecopora
• † Myalina
  • † Myalina parallela – or unidentified comparable form

N

• † Naiadites – tentative report

• 

  † Naticopsis
  • † Naticopsis clinovata – or unidentified comparable form
  • † Naticopsis genevievensis
• † Neochonetes
• † Neoglyphioceras
  • † Neoglyphioceras caneyanum
  • † Neoglyphioceras crebriliratum
• † Nostocites
• † Nucleospira
  • † Nucleospira raritas
• † Nuculavus
  • † Nuculavus okawensis
• † Nuculopsis
  • † Nuculopsis shumardana

O

• † Ogygoceras
  • † Ogygoceras gracile
• † Onychotreta
  • † Onychotreta lenta
  • † Onychotreta mesleri
  • † Onychotreta miseri
  • † Onychotreta multiplicata
  • † Onychotreta plicata
• † Orbiculoidea
• † Orospira
  • † Orospira elegantula
• † Orthobairdia
  • † Orthobairdia cestriensis
• † Orthonychia
  • † Orthonychia compressum
  • † Orthonychia ungula
• † Orthostrophella
  • † Orthostrophella clairensis
• † Orthotetes
• † Ortonella – tentative report
  • † Ortonella kershopensis
• † Ovatia
• † Oxoplecia
  • † Oxoplecia infrequens
• † Ozarcus – type locality for genus
  • † Ozarcus mapesae – type locality for species

P

• † Pachylyroceras
  • † Pachylyroceras cloudi
  • † Pachylyroceras newsomi
• † Paladin
  • † Paladin mucronatus
• † Palaeacis
  • † Palaeacis carinata
• † Palaeocapulus
  • † Palaeocapulus undata
• † Palaeoneilo
  • † Palaeoneilo sera
• † Paleoconus
  • † Paleoconus bakeri – type locality for species
• † Paleyoldia
  • † Paleyoldia angustia – type locality for species
  • † Paleyoldia bruta – type locality for species
• † Palmerocrinus
  • † Palmerocrinus kesslerensis – type locality for species
• † Paracravenoceras
  • † Paracravenoceras ozarkense – type locality for species
• † Paracromyocrinus
  • † Paracromyocrinus oklahomensis
• † Paradimorphoceras
• † Paralegoceras
  • † Paralegoceras iowense
  • † Paralegoceras texanum
• † Parallelodon
  • † Parallelodon cancellosus – or unidentified comparable form
• † Paramphicrinus
  • † Paramphicrinus magnus – type locality for species
• † Paraparchites – tentative report
  • † Paraparchites cyclopeus
• † Parastrophinella
  • † Parastrophinella lepida
• † Parvaxon
  • † Parvaxon minutum
• † Patellilabia
  • † Patellilabia laevigata
  • † Patellilabia rhombadella – type locality for species
  • † Patellilabia sulcata – type locality for species

• 

  † Pentremites
• † Pericyclus
• † Perigrammoceras
• † Perimestocrinus
  • † Perimestocrinus teneris
• † Peripetoceras
  • † Peripetoceras ozarkense – type locality for species
• † Permophorus
• † Phaneroceras
  • † Phaneroceras compressum
  • † Phaneroceras kesslerense – type locality for species
• † Pharkidonotus
• † Phestia
  • † Phestia corrugata – type locality for species
  • † Phestia obtusa – type locality for species
  • † Phestia wortheni – type locality for species
• † Phricodothyris
• † Pilosisporites
  • † Pilosisporites williamsii
• † Pionoceras
  • † Pionoceras smithvillense
• † Placotriplesia
  • † Placotriplesia juvenis
  • † Placotriplesia praecipta

• 

  † Platyceras
  • † Platyceras latum
  • † Platyceras oxynotum – type locality for species
• † Plectatrypa
  • † Plectatrypa arctoimbricata
• † Plectodonta – tentative report
• † Plicochonetes
• † Plicocyrtia
  • † Plicocyrtia arkansana
• † Polidevcia
  • † Polidevcia stevensiana
• † Posidonia
  • † Posidonia nasuta
• † Productina
  • † Productina sampsoni
• † Productus

• 

  † Proetus
  • † Proetus vaningeni
• † Prolecanites
  • † Prolecanites lyoni – or unidentified comparable form
• † Proshumardites
  • † Proshumardites morrowanus
• † Prospira
  • † Prospira latior
• † Prothyris
  • † Prothyris crista – type locality for species
  • † Prothyris soleniformis – or unidentified comparable form
• † Protocycloceras
  • † Protocycloceras arkansaense
  • † Protocycloceras smithvillense
• † Pseudagnostus
  • † Pseudagnostus communis
• † Pseudokingstonia
  • † Pseudokingstonia exotica
• † Pseudopronorites
  • † Pseudopronorites arkansiensis
  • † Pseudopronorites quinni
• † Pseudorthoceras
  • † Pseudorthoceras knoxense
  • † Pseudorthoceras stonense – type locality for species
• † Pseudozygopleura
• † Pterocephalia
  • † Pterocephalia sanctisabae
• † Ptychomphalina
  • † Ptychomphalina magna – type locality for species
• † Punctospirifer
• † Pycnoceras
  • † Pycnoceras clausum
• † Pygmaeoceras
  • † Pygmaeoceras solidum

Q

• † Quinnites
  • † Quinnites henbesti
  • † Quinnites textum

R

• † Radnoria
• † Ramosites
• † Raphiophorus
  • † Raphiophorus niagarensis
• † Rayonnoceras
  • † Rayonnoceras eccentricum – type locality for species
  • † Rayonnoceras fayettevillense
  • † Rayonnoceras irregulare – or unidentified comparable form
  • † Rayonnoceras nobile – or unidentified comparable form
  • † Rayonnoceras protentum – type locality for species
  • † Rayonnoceras solidiforme
  • † Rayonnoceras vaughanianum
• † Rectangulina
• † Resserella
• † Reticulariina
• † Reticuloceras
  • † Reticuloceras tiro
  • † Reticuloceras wainwright
  • † Reticuloceras wainwrighti
• † Reticycloceras
  • † Reticycloceras croneisi – type locality for species
  • † Reticycloceras girtyi – type locality for species
  • † Reticycloceras peytonense – type locality for species
  • † Reticycloceras sequoyahense
• † Retispira
  • † Retispira cincta
  • † Retispira ordinata – or unidentified related form
  • † Retispira yochelsoni – type locality for species
• † Retites
  • † Retites semiretia
• † Reviya
  • † Reviya planus – or unidentified related form
• † Rhipidomella
• † Rhynchopora
• † Rhytiophora
  • † Rhytiophora blairi
• † Richardsonites
  • † Richardsonites richardsonianum
  • † Richardsonites richardsonianus
• † Roundyella
  • † Roundyella simplex

S

• † Sandia
• † Sanguinolites
  • † Sanguinolites simulans – tentative report
• † Sansabella
  • † Sansabella fayettevillensis
  • † Sansabella reticulata
• † Savitrisporites
  • † Savitrisporites nux
• † Schartymites
  • † Schartymites paynei
• † Schellwienella
• † Schizodus
  • † Schizodus chesterensis
• † Schizophoria
• † Schuchertella
• † Schulzospora
  • † Schulzospora rara
• † Schumardella
  • † Schumardella obsolecens
• † Sedenticellula
• † Sedgwickia
• † Seminolites
• † Septatrypa
  • † Septatrypa havliceki
• † Septimyalina
  • † Septimyalina perattenuata – or unidentified comparable form
• † Serenida
  • † Serenida seminalis
• † Shaleria
• † Solenochilus
  • † Solenochilus floweri – type locality for species
  • † Solenochilus peculiare – or unidentified comparable form
• † Solenomorpha
  • † Solenomorpha nitida
• † Spathelopsis – type locality for genus
  • † Spathelopsis browni – type locality for species

• 

  † Sphaerexochus
  • † Sphaerexochus glaber – type locality for species
• † Sphenotus
  • † Sphenotus branneri
  • † Sphenotus dubius
  • † Sphenotus meslerianus
  • † Sphenotus pisinnus – type locality for species
  • † Sphenotus washingtonensis

• 

  † Spirifer
• † Spiriferellina
• † Staurocephalus
  • † Staurocephalus lagena – type locality for species
  • † Staurocephalus oarion – type locality for species
• † Stearoceras
  • † Stearoceras gibbosum – or unidentified related form
  • † Stearoceras smithi – type locality for species
• † Stenoglaphyrites
  • † Stenoglaphyrites involutus – type locality for species
  • † Stenoglaphyrites miseri – type locality for species
• † Stenopronorites
• † Sthenarocalymene
  • † Sthenarocalymene scutula – type locality for species

• 

  † Stigmaria
  • † Stigmaria wedingtonensis
• † Stioderma
  • † Stioderma hadra – type locality for species
• † Streptis
  • † Streptis glomerata
• † Streptorhynchus
• † Strobeus
• † Stroboceras
  • † Stroboceras gordoni – type locality for species
  • † Stroboceras sulcatum – or unidentified comparable form
• † Sudeticeras
• † Sulcella
• † Sulcogirtyoceras
  • † Sulcogirtyoceras jasperense – type locality for species
  • † Sulcogirtyoceras limatum
• † Sutherlandia
• † Syngastrioceras
  • † Syngastrioceras globosum
  • † Syngastrioceras oblatum
  • † Syngastrioceras scotti
• † Syntrophopsis
  • † Syntrophopsis grandis – type locality for species

T

• † Tectamichelina – type locality for genus
  • † Tectamichelina mangeri – type locality for species
• † Teiichispira
  • † Teiichispira odenvillensis
• † Tesuquea
• † Tetracamera
• † Tetratylis – tentative report
• † Tetratylus – tentative report
• † Torynifer
• † Trepspira
  • † Trepspira tentative report type locality for species – informal
• † Triboloceras – tentative report
• † Tripteroceroides – tentative report

• 

  Trypanites
• † Tylonautilus
  • † Tylonautilus gratiosus

U

• † Utharocrinus
  • † Utharocrinus pentanodus

V

• † Valhallites
  • † Valhallites ornatus – type locality for species
  • † Valhallites tuberculatus – type locality for species
  • † Valhallites westforkensis – type locality for species
• † Verneuilites
  • † Verneuilites pygmaeus
• † Virgaspongia – type locality for genus
  • † Virgaspongia ichnata – type locality for species
• † Virginiata
  • † Virginiata arkansana
• † Voiseyella
• † Vorticina
  • † Vorticina venata

W

• † Wichitoceras
  • † Wichitoceras compressum
• † Wiedeyoceras
  • † Wiedeyoceras williamsi – type locality for species
• † Wilkingia
  • † Wilkingia inflata – or unidentified comparable form
• † Winslowoceras
  • † Winslowoceras henbesti – type locality for species

X

• † Xenocheilos
  • † Xenocheilos minutum

Y

• † Yochelsonospira
  • † Yochelsonospira tenuilineata

Z

• † Zaphrentites
  • † Zaphrentites arkansanus
• † Zia
• † Zygopleura – report made of unidentified related form or using admittedly obsolete nomenclature

References

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database" . Retrieved 17 December 2021.