Isotelus ID

[Fossil Claw]

I purchased this Isotelus labelled as the species gigas. The bug is 1 1/8 inches long.

 

A friend that collects, buys, and sells mostly Cincinnati fossils thinks it is really the species maximus.

 

The fossil was collected in the Kope Formation of Brown .

 

I just want to make sure I label it correctly in my collection database.

[piranha]

Yes, Isotelus maximus.  Small juvenile Isotelus gigas have genal spines, as size increases the spines are reduced and eventually disappear.

 

 

                         Isotelus gigas                                                          Isotelus maximus