Found this Saturday. Is it Acidaspis cincinnatiensis or Primaspis crosotus

[Fossil Claw]

Found this trilobite Saturday in northern Kentucky.

 

Is it Acidaspis cincinnatiensis or Primaspis crosotus.

 

looks like it might be complete.

 

nervus about trying to prep it since either one is really rare.

 

 

[Fossil Claw]

I am guessing Primaspis crosotus.

 

[piranha]

On 6/25/2018 at 7:47 AM, Fossil Claw said:

I am guessing Primaspis crosotus.

 

 

The name changes can certainly be confusing; it was originally described as Ceraurus crosotus!  

 

Locke, J. 1843

Notice of a new trilobite Ceraurus crosotus.

American Journal of Science, 44:346

 

Locke, J. 1843

Supplementary notice of the Ceraurus crosotus.

American Journal of Science, 45:222-224   Locke 1843

 

 

Meadowtownella crosotus is the current classification.

 

Conway, T.M., & Botting, J.P. 2012

Description and ecology of a new Middle Ordovician (Llanvirn) odontopleurid trilobite from the Builth Inlier of Mid-Wales, with a review of the genus Meadowtownella.

Geological Magazine, 149(3):397-411   PDF LINK

[Fossil Claw]

7 minutes ago, piranha said:

 

 

The name changes can certainly be confusing; it was originally described as Ceraurus crosotus!  

 

Locke, J. 1843

Notice of a new trilobite Ceraurus crosotus.

American Journal of Science, 44:346

 

Locke, J. 1843

Supplementary notice of the Ceraurus crosotus.

American Journal of Science, 45:222-224   Locke 1843

 

 

Meadowtownella crosotus is the current classification.

 

Conway, T.M., & Botting, J.P. 2011

Description and ecology of a new Middle Ordovician (Llanvirn) odontopleurid trilobite from the Builth Inlier of Mid-Wales, with a review of the genus Meadowtownella.

Geological Magazine, 149(3):397-411   PDF LINK

So do you think I had the right id other than the name change?

 

[piranha]

2 minutes ago, Fossil Claw said:

So do you think I had the right idea other than the name change?

 

 

Yes, it is definitely Meadowtownella crosotus

Acidaspis cincinnatiensis has an occipital spine and long pygidial spines.