What would be a good way to find the differences of the trilobite?
I love getting trilobites because in my opinion they are free points for ID'ing.
Cryptolithus has the very long lace sweeping structures coming from its frontal lobe.
Eldredgeops has the rough surface on its headshield.
Calymene is almost pointing where its segments get gradually smaller.
Elrathia is a little tricky just because depending on the specimen the tell tale part can be covered, but normally where the long lace sweeping structures would be on Cryptolithus, Elrathia has almost two shorter pointy protrusions coming from the headshield.
Isotelus is pretty easy just because it is pretty symmetrical, it possesses a pretty prominent head and tail shield which pretty much gives it away.