Unknown Calymene Trilobite

[A.C.]

Hey all,

I just purchased this fossil over the weekend. The person I purchased form had this documentation:

Calymene celebra
Sil-Waldron Sh.
Hartsville, In.

 

Let's assume locality and age are correct, can anyone confirm if this is a Calymene celebra? My gut is telling me a Calymene breviceps but I am new to Calymene trilobites.

 

Specimen is roughly 2.75 cm wide and estimated 6.25 cm if prone

 

Also while we are talking about Calymene trilobites is there any good resources anyone knows of for IDing them? I have some more that I would like an ID on.

 

Any input is welcome!

 

[piranha]

Calymene breviceps is the only species of calymenid from the Waldron Shale. The frontomedian glabellar lobe of C. breviceps protrudes over the cephalic anterior border.

 

fig. 7 from:

 

Edgecombe, G.D., Adrain, J.M. 1995

Silurian Calymenid Trilobites from the United States.

Palaeontographica Abteilung A, 235:1-19

 

additional reading:

 

Whittington, H.B. 1971

Silurian Calymenid Trilobites from United States, Norway, and Sweden.

Palaeontology, 14(3):455-477  PDF LINK