Mystery Ordovician Brachiopod

After researching the Fossils of Ohio and Index Fossils of North America books and the KYANA Geological Society and Dry Dredgers websites for an image of a brachiopod similar to this one, I am at a loss to find a name. It reminds me of a Devonian Period Athyris but this brachiopod was found in the Ordovician Period Kope Formation, Carroll County, Kentucky.  I only found one and discovered it while cleaning a group of brachiopods out of a group of maybe 20.

Any guesses what this brachiopod might be called?

UPDATE: It appears this brachiopod cannot be from the Ordovician Period so either I mixed it up with another fossil batch or someone dropped it there.  I visited the area again and could not find anything close to what this one looks like.  It does look like a Mississippian Period Cleiothyridina sublamello from the Glen Dean Formation of Indiana.  See the fossilicious.com web entry for a picture. The size they describe would make it much larger than the one pictured here.

 

Commissura or margin where shell halves open and close (anterior).

Hinge view (posterior)

It was the only one I found in a plane of maybe 20 or so other brachiopods.  The other brachiopods found were these Dalmanella sp. (a.k.a. Onniella)

 

The other type of brachiopod found were these Sowerbyella sp.

Cyrtolites ornatus Monoplacophoran Fossil

UPDATE (01/27/2010): After cleaning this fossil off some more I changed its identification to Cyrtolites ornatus (Conrad, 1838) after the undulation (definition: having a wavy or curving form) were revealed by sand blasting.  If I can get more of the matrix off, this will be a very nice looking fossil.  The keel shape going down the center has a very nice form.  Thanks to Kenny for alerting me to what this fossil really was.

UPDATE(09/18/2021): After doing some research on another fossil I realized I had this fossil genus spelled wrong. Name has been corrected. Add name of person who named species and classified as a monoplacophoran.

ORIGINAL POST:
Here are some Bellerophon fossils I found in the Kope Formation in Carroll County, Kentucky.  Until now, I have not found growth line patterns found on the shell.  Usually, I just find a smooth shell pattern with the ridge line running the length of the shell.  A Cyclonema fossil is attached to the Bellerophon.

It is a neat find and I hope to clean with air abrasion sometime to reveal the growth lines.

This Bellerophon mold is typical of the ones I find at Ordovician Period road cuts around the Louisville area. It has a nice whirl at one end of the fossil.

Kope Formation Fossils

The rain has stopped and the temperature is in the 50s degrees F so it was time to get out and do some fossil collecting. These fossils were found in Kope Formation in Carroll County, Kentucky. These creatures existed in the Ordovician Period. These first two images are of an enrolled Flexicalymene trilobite that has not been prepped yet so I am not sure if its cephalon is intact or not.

This small clam fossil is quite a find. Its shell has been replaced with aragonite (brown calcite?) and both sides are there. The middle of both sides has eroded out though. This clam was called Ambonychia.

This fossil is an orthoceras type cephalopod that has part of its aragonite shell exposed that was covered by bryozoan. Note: I am not sure this brown material is aragonite because from what I read that form of calcium carbonate is not particularly stable and is eventually replaced by calcite.  Would it be possible the bryozoan layer protected this fossil in aragonite form from mineral replacement?

Here is a Cryptolithus trilobite that has its cephalon with its lace collar and glabella.  It also has  an Ambonychia clam shell fragment attached.

 

The fossils are small but it was fun finding them.