I’ve mistaken a few clams for Brachiopods, but there is a difference. Brachiopods tend to be a mirror image from left to right whereas Clams are mirrored top to bottom if you look at them straight on. There is still a lot I have to learn about Brachiopods in general.
Brachiopods Through Time
Brachiopod diversity was more or less high throughout the Carboniferous. After the period changed over to the Permian, the diversity sharply declined and never recovered to levels sustained from 485 until 299 million years ago.
Today, there are about 100 living genera, however there have been about 5,000 discovered in the fossil record.
Brachiopods from Parks Township
A Steinkern of the Brachiopod Composita 
Brachiopod Specimens from the Catalog
There are several brachiopods in the general collection and a handful entered into the catalog. The following specimens are entered.
CG-0001, Orthotetes 
CG-0008, Eomarginifera longispinus 
CG-0020, Linoproductus 
CG-0035, Antiquatonia portlockiana 
CG-0086, Composta 
CG-0103, Neospirifer 
CG-0105, Pulchratia 
CG-0109, Brachiopod 
CG-0137, Linoproductus
More about Brachiopods
- http://paleo.cortland.edu/tutorial/Brachiopods/brachmorph.htm
- https://ucmp.berkeley.edu/brachiopoda/brachiopoda.html
- https://en.wikipedia.org/wiki/Brachiopod
- https://www.bgs.ac.uk/discoveringgeology/time/Fossilfocus/brachiopod.html
References
- 2010, Sarda Sahney, Michael J. Benton, Howard J. Falcon-Lang; Rainforest collapse triggered Carboniferous tetrapod diversification in Euramerica. Geology ; 38 (12): 1079–1082. doi: https://doi.org/10.1130/G31182.1