Are these the same?

[aek]

Are these two odontopleurid pygidiums from the same species? They don't seem to match up.  Same locality, Maquoketa group.First one measures 4mm across and the second measures 2mm. I'm finding not much information  on odontopleurids from the Maquoketa... Leonaspis? Any help appreciated.

[piranha]

Odontopleuridae indet. will have to suffice until you can find specimens that are more complete. The temporal range of Leonaspis is Silurian (Ludlow) - Devonian (Emsian).

 

 

Ramsköld, L., Chatterton, B.D.E. 1991

Revision and Subdivision of the Polyphyletic 'Leonaspis' (Trilobita).

Transactions of the Royal Society of Edinburgh: Earth Sciences, 82:333-371  PDF LINK

[aek]

@piranha Thanks for the link!