Mollusks, including snails, clams, cephalopods, monoplacoferans & rostroconchs

Mollusks are the most abundant “shell” on a beach or riverbank. Modern cephalopods include squid, octopus and nautiloids. They are (and have always been) strictly marine. Gastropods (snails) live in the greatest diversity of ecosystems – marine, fresh & brackish water and on land. Clams are similar except for land. Monoplacophorans & scaphopods are exclusively marine. Rostroconchs are the only extinct class of mollusks.

Mollusk Photos (organized by class)

Bembexia sulcomarginata - an exceptional specimen of a common Devonian snail. — *Bembexia sulcomarginata* (Hall) – an exceptional specimen of a common Devonian species.

Preservation: C = Calcified, Ph = Phosphatic, P = Pyritized, S = Silicified, 1= w/o, matrix, 2 = w/ matrix

CEPHALOPODS Period Location Preservation

NAUTILOIDS

Dawsonoceras amycus Middle Silurian IN C,2

Nautiloid cephalopod Michelinoceras sp. is generally found in small segments. This is the largest I found almost 16 cm long. — Michelinoceras sp. is generally found in small segments. This is the largest I found.

Michelinoceras sp. – Coral Ridge Member, New Providence Shale, basal Middle Mississippian, Jefferson Co., KY – P,1

Ovoceras oviforme (or Acleistoceras?) – Sellersburg = North Vernon Limestone, Clark Co., Indiana – S,1

Small, somewhat egg-shaped nautiloid, Ovoceras oviforme — Small, somewhat egg-shaped nautiloid

Treptoceras duseri (Hall & Whitfield) – Ubiquitous in the Upper Ordovician of the Tri-state area (IN, KY, OH), C,1,2

To be determined – large Devonian coiled nautiloid. Extremely rare, this specimen was found at the Speed Quarry in the Jeffersonville Limestone, Middle Devonian.

Large Devonian coiled nautiloid., about 20 com across. Extremely rare, this specimen was found at the Speed Quarry in the Jeffersonville Limestone, Middle Devonian. — Large Devonian nautiloid

GONIATITES

Cantabricanites greenei (Miller) – Coral Ridge Member, New Providence Shale, basal Middle Mississippian, Jefferson Co., KY – P,1

Goniatite cephalopod Cantabricanites greenei range from a few millimeters to a centimeter wide. — *Cantabricanites greenei* (Miller) range from a few millimeters to a centimeter wide.

Polaricyclus ballardensis (Work & Mason) – Coral Ridge Member, New Providence Shale, basal Middle Mississippian, Jefferson Co., KY – P,1

Polaricyclus conkini (Work & Mason) – Coral Ridge Member, New Providence Shale, basal Middle Mississippian, Jefferson Co., KY – P,1

AMMONITES & BELEMNITES

Actinocamex verus (1) Cretaceous United Kingdom C,1

Baculites sp. Cretaceous Texas C,1

Belemitella americanus Jurassic Wyoming C,1

Hastites sp. (baculites) Lias, Early Jurassic Portugal C,1

Hildoceras bifrons ” ” ” Portugal C,1

Unidentified ” ” ” Portugal P,1

GASTROPODS/MONOPLACOPHORANS Period Location Preservation

Bellerophon gibsoni Middle Mississippian KY C,1

Bembexia sulcomarginata Middle Devonian IN S,1,2

Cyclonema sp. Upper Ordovician IN, KY C,1,2

Crytolites carinatus (Monoplacophoran) Upper Ordovician KY C,1

Glabrocingulum ellenae (Conkin), Coral Ridge Member, New Providence Shale, basal Middle Mississippian, Jefferson Co., KY – P,1 (type locality)

Glabrocingulum ellenae is a common pyrite-replaced snail. 4 in photo. — *Glabrocingulum ellenae* (Conkin) is a common pyrite-replaced snail

Globularia umbilica Upper Cretaceous MS C,1

Liospira macula Upper Ordovician KY C,1,2

Lophospira medialis Middle Ordovician KY S1,2

Lophospira biseriatus? Upper Ordovician KY C,1,2

Loxonema sp. Middle Ordovician KY S,1,2

Loxonema sp. – Coral Ridge Member, New Providence Shale, basal Middle Mississippian, Jefferson Co., KY – P,1

Pyrite-replaced Loxonema sp. often shows fine growth lines — *Loxonema* sp. often shows fine growth lines

Paupospira bowdeni Upper Ordovician KY C,1,2

Natica tigra (1) Miocene Poland C,1

Naticonema lineata Middle Devonian IN C,1

Platyceras (Orthonychia) acutirostre Middle Mississippian KY C,1,2

Platyceras spp. Middle Devonian IN,KY C,2 (variable avail.)

Platyceras (Platystoma) niagarense Middle Silurian IN C,1,2

Pleurotomaria sp. Kimmerdgian, Late Jurassic Portugal C,1

Sinuitina annaea (Conkin) – Monoplacophoran – Coral Ridge Member, New Providence Shale, basal Middle Mississippian, Jefferson Co., KY – P,1 (type locality)

Sinuitina annaea is a monoplacophoran from the Coral Ridge Member, New Providence Shale, basal Middle Mississippian, — *Sinuitina annaea* (Conkin)

Sinuites cancellatus (Monoplacophoran) Upper Ordovician KY C,1,2

Sphenosphaera troosti Middle Ordovician KY S,1,2

Strophostylus cyclostomus Middle Silurian IN C,1,2

Trepispira sp. – Coral Ridge Member, New Providence Shale, basal Middle Mississippian, Jefferson Co., KY – P,1

Pyrite-replaced Trepispira from the coral Ridge member of the New Providence Shale — Pyrite-replaced *Trepispira*

Turbonopsis shumardi Middle Devonian IN C,1,2 & impressions in stroms

Turretilla mcnairyensis Upper Cretaceous MS C,1

BIVALVES (CLAMS) Period Location Preservation

Ambonychia spp. Upper Ordovician IN, KY C,1,2

Anomia argenta Upper Cretaceous MS C,1

Caritodens demissa Upper Ordovician IN, KY C,2

Crassatella vadosus Upper Cretaceous MS C,1

Ctenodonta sp. – Coral Ridge Member, New Providence Shale, basal Middle Mississippian, Jefferson Co., KY – P,1

Cycloconcha milleri Upper Ordovician IN C,2

Cypricardinia arata Middle Silurian IN C,2

Deceptrix filistriata Upper Ordovician KY C,1,2

Deceptrix cf. D. hartsvillensis Middle Ordovician KY S,1,2

Exogyra costata (Say) – Coon Creek Mbr., Ripley Formation, Upper Cretaceous, Union Co., Mississippi – C,1

Exogyra costata with Entobia borings from the Coon Creek Mbr., Ripley Formation, Upper Cretaceous — *Exogyra costata* (Say) with Entobia borings

Limopsis meeki ” ” MS C,1

Limoptera cancellata Middle Devonian IN S,1,2

Lyrodesma conradi Upper Ordovician KY C,1,2

Modiolopsis sp. ” ” IN, KY C,2

Modiomorphia concentrica (Conrad), Sellersburg Limestone, Givetian, Middle Devonian, Clark Co., IN -S,2

Clam Modiomorphia concentrica showing growth rings — *Modiomorphia concentrica* showing growth rings

Myalina sp. Middle & Upper Mississippian IN, KY C,S,2

Myaina subquadrata Pennsylvanian Kansas C,1

Nucula percrassa Upper Cretaceous MS C,1

Nuculana australis ” ” MS C,1

Nuculana whitfieldi ” ” MS C,1

Nuculopsis sp. – Coral Ridge Member, New Providence Shale, basal Middle Mississippian, Jefferson Co., KY – P,1

Paracyclas elliptica (ohiense) Middle Devonian IN, KY C,S,1,2

Paracyclas liriata (rugosa) ” ” IN, KY S,1

Pecten sp. Miocene Oregon C,2

Phestia sp. – Coral Ridge Member, New Providence Shale, basal Middle Mississippian, Jefferson Co., KY – P,1

Razor clam Phestia sp. - Coral Ridge Member, New Providence Shale, basal Middle Mississippian, — Phestia sp. – an ancient razor clam

Pterinea brisa Hall – Waldron Shale, Middle Silurian, Clark Co., IN – C,2

Pterinea brisa - a Silurian scallop, often shows district growth bands — *Pterinea brisa* Hall – a Silurian scallop, often shows district growth bands

Toredo rectus Upper Cretaceous MS C,1

Vanuxemia gibbosa Middle Ordovician KY S,1,2

Internal casts Middle Devonian IN C,1

Mother of Pearl fragments Upper Cretaceous MS C,1

ROSTROCONCHS & SCAPHOPODS

Dentalium inornatum Upper Cretaceous MS C,1

Dentalium ripleyanum ” ” MS C,1

Hippocardia cuneus (Conrad) – Jeffersonville Limestone, Middle Devonian, Clark Co., IN, Jefferson Co., KY – C,1,2

Rostroconch Hippocardia cuneus was called Conocardium at one time. — Hippocardia cuneus was called Conocardium at one time.

Pseuomulceodens cancellatum (Hyde) – Coral Ridge Member, New Providence Shale, basal Middle Mississippian, Jefferson Co., KY – P,1

Rostroconch Pseuomulceodens cancellatum (Hyde) - Coral Ridge Member, New Providence Shale, basal Middle Mississippian — *Pseuomulceodens cancellatum* (Hyde) – a very uncommon rostroconch