Cincinnatian Trilobites

Upper Ordovician Period

Isotelus maximus Locke

This specimen is 9 " long. The preservation is the best of any Isotelus found at the famous Mt. Orab Site. Almost all prone Isotelus are found upside down, including this one. This specimen was collected and prepared by Dan Cooper. Marty Sugar collection.
FULL SIZE IMAGE---ADDITIONAL SPECIMEN

Isotelus gigas DeKay

This specimen was collected by Gary Cooper age 4 at Caesars Creek State Park. It differs from Isotelus maximus by the more triangular outline of the cephalon and pygidium and small genal spines. This specimen is 1" wide.
FULL SIZE IMAGE

Isotelus brachycephalus (Foerste)

This species differs from Isotelus maximus in its smaller length to width ratio and genal spines which tend to curve outward. This specimen was found by Dale Hoecevar, collected and prepared by Dan Cooper. Bob Schacht collection.
FULL SIZE IMAGE

Flexicalymene meeki (Foerste)

This specimen was collected by Don Cooper at Monroe, Ohio in the upper Corryville member. Well preserved specimen have sharp genal spines up to 1/8 inch long. Most large well preserved Flexicalymene are found in the Corryville Member.
FULL SIZE IMAGE

Flexicalymene retrorsa (Foerste)

This specimen was collected in Mount Orab, Ohio in the Arnheim formation. Flexicalymene retrorsa first appears in the lower Richmond and are abundantly found in the famous Waynesville formations. This locality has produced over 15,000 trilobites since 1984.
FULL SIZE IMAGE---2 3/16 LONG SPECIMEN

Flexicalymene granulosa

This specimen was collected in Hamilton County in the Alexandria sub-member of the Southgate. This species is distinguished by its postulous surface. Flexicalymene granulosa are found below the Fairmount Formation.
FULL SIZE IMAGE

Ceraurus milleranus Miller & Gurley

This specimen was collected in Northern Kentucky in the Fulton beds by Jim Schwartz. A rare trilobite in the Cincinnatian, Ceraurus are commonly found associated with the crinoid Glytocrinus.
FULL SIZE IMAGE

Achatella carleyi

This specimen was collected by Bob White in Northern Kentucky in the Fairmount Formation. Achatella have large compound eyes and one of the few trilobites associated with bryozoa.
FULL SIZE IMAGE

Tricopelta breviceps (Hall)

This specimen was collected near St. Leon, Indiana by Dan Cooper. A small trilobite, when first found, they are easily mistaken for Flexicalymene. They are distinguished by the beautiful compound eyes and long stream lined pydidium.
FULL SIZE IMAGE

Platycorphia christyi

This very rare species is typically found with Flexicalymene in the "butter" layers of the Fort Ancient member. It is easily mistaken for Flexicalymene. Collected at Oldenburg, Indiana by Dan Cooper, Dan Cooper collection.
FULL SIZE IMAGE

Proetus spurlocki Hall

This specimen was collected in Cincinnati. Normally found in the kope formation, they are very rare.
FULL SIZE IMAGE

Triarthrus eatoni (Hall)

This species is found in the Kope formation and is extremely rare. The genus Triarthus are found near Rome, New York with appendages preserved.
FULL SIZE IMAGE

Acidaspis cincinnatiensis

This fantastic specimen was collected and prepared by Jerry Rush. There are secondary spines preserved on the occipital spine. Asidaspis are distinguished by their long genial spines, postulous exoskeleton and large occipital spine. Steve Brown Collection.
FULL SIZE IMAGE ----FRONT VIEW

Odontopleurid (onealli)

This specimen was collected by Jerry Rush. Similar to Acidaspis except no occipital spine. S.A Milleri described this specimen as Acidaspis onealli in The Cincinnati Quarterly Jour of Science, Jan 1875, page 86. Harry Wittington assigns this name a synonym in the J of P 1956, page 512. Steven Brown Collection.
FULL SIZE IMAGE

Primaspis crosota

This specimen was collected in Cincinnati, Ohio by Caroline Green. Uncommon, they are typically found associated with crinoid lenses.
FULL SIZE IMAGE

Ceraurinus icarus (Billings)

This specimen was collected near Eaton, Ohio by Jerry Rush. This is the rarest of all the Cincinnati trilobites. It is found in the upper layers of the Richmond Formation.
FULL SIZE IMAGE

Amphilichas halli (Foerste)

This 2 3/4" specimen was found in Oldenburg, Indiana. One of the more beautiful of the Cincinnatian trilobites, this trilobite has large genal spines and a fan shaped tail. It is found from the Fairmount to the Richmond. Jack Shirley collection.
FULL SIZE IMAGE ---ADDITIONAL SPECIMEN

Cryptolithus tessellatus Green

This specimen was collected in Cincinnati by Dan Cooper. This trilobite is commonly called the "lace collar" trilobite. It has extremely long genal spines and a nice occipital spine. Normally thin and fragile, complete specimen are extremely rare.
FULL SIZE IMAGE

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Copyright American trilobite suppliers January 2005

Cincinnatian Trilobites

Upper Ordovician Period

Isotelus maximus Locke

This specimen is 9 " long. The preservation is the best of any Isotelus found at the famous Mt. Orab Site. Almost all prone Isotelus are found upside down, including this one. This specimen was collected and prepared by Dan Cooper. Marty Sugar collection. FULL SIZE IMAGE---ADDITIONAL SPECIMEN

Isotelus gigas DeKay

This specimen was collected by Gary Cooper age 4 at Caesars Creek State Park. It differs from Isotelus maximus by the more triangular outline of the cephalon and pygidium and small genal spines. This specimen is 1" wide. FULL SIZE IMAGE

Isotelus brachycephalus (Foerste)

This species differs from Isotelus maximus in its smaller length to width ratio and genal spines which tend to curve outward. This specimen was found by Dale Hoecevar, collected and prepared by Dan Cooper. Bob Schacht collection. FULL SIZE IMAGE

Flexicalymene meeki (Foerste)

This specimen was collected by Don Cooper at Monroe, Ohio in the upper Corryville member. Well preserved specimen have sharp genal spines up to 1/8 inch long. Most large well preserved Flexicalymene are found in the Corryville Member. FULL SIZE IMAGE

Flexicalymene retrorsa (Foerste)

This specimen was collected in Mount Orab, Ohio in the Arnheim formation. Flexicalymene retrorsa first appears in the lower Richmond and are abundantly found in the famous Waynesville formations. This locality has produced over 15,000 trilobites since 1984. FULL SIZE IMAGE---2 3/16 LONG SPECIMEN

Flexicalymene granulosa

This specimen was collected in Hamilton County in the Alexandria sub-member of the Southgate. This species is distinguished by its postulous surface. Flexicalymene granulosa are found below the Fairmount Formation. FULL SIZE IMAGE

Ceraurus milleranus Miller & Gurley

This specimen was collected in Northern Kentucky in the Fulton beds by Jim Schwartz. A rare trilobite in the Cincinnatian, Ceraurus are commonly found associated with the crinoid Glytocrinus. FULL SIZE IMAGE

Achatella carleyi

This specimen was collected by Bob White in Northern Kentucky in the Fairmount Formation. Achatella have large compound eyes and one of the few trilobites associated with bryozoa. FULL SIZE IMAGE

Tricopelta breviceps (Hall)

This specimen was collected near St. Leon, Indiana by Dan Cooper. A small trilobite, when first found, they are easily mistaken for Flexicalymene. They are distinguished by the beautiful compound eyes and long stream lined pydidium. FULL SIZE IMAGE

Platycorphia christyi

This very rare species is typically found with Flexicalymene in the "butter" layers of the Fort Ancient member. It is easily mistaken for Flexicalymene. Collected at Oldenburg, Indiana by Dan Cooper, Dan Cooper collection. FULL SIZE IMAGE

Proetus spurlocki Hall

This specimen was collected in Cincinnati. Normally found in the kope formation, they are very rare. FULL SIZE IMAGE

Triarthrus eatoni (Hall)

This species is found in the Kope formation and is extremely rare. The genus Triarthus are found near Rome, New York with appendages preserved. FULL SIZE IMAGE

Acidaspis cincinnatiensis

This fantastic specimen was collected and prepared by Jerry Rush. There are secondary spines preserved on the occipital spine. Asidaspis are distinguished by their long genial spines, postulous exoskeleton and large occipital spine. Steve Brown Collection. FULL SIZE IMAGE ----FRONT VIEW

Odontopleurid (onealli)

Primaspis crosota

This specimen was collected in Cincinnati, Ohio by Caroline Green. Uncommon, they are typically found associated with crinoid lenses. FULL SIZE IMAGE

Ceraurinus icarus (Billings)

This specimen was collected near Eaton, Ohio by Jerry Rush. This is the rarest of all the Cincinnati trilobites. It is found in the upper layers of the Richmond Formation. FULL SIZE IMAGE

Amphilichas halli (Foerste)

This 2 3/4" specimen was found in Oldenburg, Indiana. One of the more beautiful of the Cincinnatian trilobites, this trilobite has large genal spines and a fan shaped tail. It is found from the Fairmount to the Richmond. Jack Shirley collection. FULL SIZE IMAGE ---ADDITIONAL SPECIMEN

Cryptolithus tessellatus Green

This specimen was collected in Cincinnati by Dan Cooper. This trilobite is commonly called the "lace collar" trilobite. It has extremely long genal spines and a nice occipital spine. Normally thin and fragile, complete specimen are extremely rare. FULL SIZE IMAGE

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This specimen is 9 " long. The preservation is the best of any Isotelus found at the famous Mt. Orab Site. Almost all prone Isotelus are found upside down, including this one. This specimen was collected and prepared by Dan Cooper. Marty Sugar collection.
FULL SIZE IMAGE---ADDITIONAL SPECIMEN

This specimen was collected by Gary Cooper age 4 at Caesars Creek State Park. It differs from Isotelus maximus by the more triangular outline of the cephalon and pygidium and small genal spines. This specimen is 1" wide.
FULL SIZE IMAGE

This species differs from Isotelus maximus in its smaller length to width ratio and genal spines which tend to curve outward. This specimen was found by Dale Hoecevar, collected and prepared by Dan Cooper. Bob Schacht collection.
FULL SIZE IMAGE

This specimen was collected by Don Cooper at Monroe, Ohio in the upper Corryville member. Well preserved specimen have sharp genal spines up to 1/8 inch long. Most large well preserved Flexicalymene are found in the Corryville Member.
FULL SIZE IMAGE

This specimen was collected in Mount Orab, Ohio in the Arnheim formation. Flexicalymene retrorsa first appears in the lower Richmond and are abundantly found in the famous Waynesville formations. This locality has produced over 15,000 trilobites since 1984.
FULL SIZE IMAGE---2 3/16 LONG SPECIMEN

This specimen was collected in Hamilton County in the Alexandria sub-member of the Southgate. This species is distinguished by its postulous surface. Flexicalymene granulosa are found below the Fairmount Formation.
FULL SIZE IMAGE

This specimen was collected in Northern Kentucky in the Fulton beds by Jim Schwartz. A rare trilobite in the Cincinnatian, Ceraurus are commonly found associated with the crinoid Glytocrinus.
FULL SIZE IMAGE

This specimen was collected by Bob White in Northern Kentucky in the Fairmount Formation. Achatella have large compound eyes and one of the few trilobites associated with bryozoa.
FULL SIZE IMAGE

This specimen was collected near St. Leon, Indiana by Dan Cooper. A small trilobite, when first found, they are easily mistaken for Flexicalymene. They are distinguished by the beautiful compound eyes and long stream lined pydidium.
FULL SIZE IMAGE

This very rare species is typically found with Flexicalymene in the "butter" layers of the Fort Ancient member. It is easily mistaken for Flexicalymene. Collected at Oldenburg, Indiana by Dan Cooper, Dan Cooper collection.
FULL SIZE IMAGE

This specimen was collected in Cincinnati. Normally found in the kope formation, they are very rare.
FULL SIZE IMAGE

This species is found in the Kope formation and is extremely rare. The genus Triarthus are found near Rome, New York with appendages preserved.
FULL SIZE IMAGE

This fantastic specimen was collected and prepared by Jerry Rush. There are secondary spines preserved on the occipital spine. Asidaspis are distinguished by their long genial spines, postulous exoskeleton and large occipital spine. Steve Brown Collection.
FULL SIZE IMAGE ----FRONT VIEW

This specimen was collected in Cincinnati, Ohio by Caroline Green. Uncommon, they are typically found associated with crinoid lenses.
FULL SIZE IMAGE

This specimen was collected near Eaton, Ohio by Jerry Rush. This is the rarest of all the Cincinnati trilobites. It is found in the upper layers of the Richmond Formation.
FULL SIZE IMAGE

This 2 3/4" specimen was found in Oldenburg, Indiana. One of the more beautiful of the Cincinnatian trilobites, this trilobite has large genal spines and a fan shaped tail. It is found from the Fairmount to the Richmond. Jack Shirley collection.
FULL SIZE IMAGE ---ADDITIONAL SPECIMEN

This specimen was collected in Cincinnati by Dan Cooper. This trilobite is commonly called the "lace collar" trilobite. It has extremely long genal spines and a nice occipital spine. Normally thin and fragile, complete specimen are extremely rare.
FULL SIZE IMAGE