unidentified Weeks Trilobite

[trilobite tim]

In case the label is a little hard to read:  11x7 mm, 22 segments, collected in North Valley, House Range, Weeks formation.  I'm not at all sure what this species is.  Any help would be much appreciated.  I'm thinking it is a Modocia, but could easily be wrong.  It is from the buff layers, but I did not collect it in the quarry, but up on the hill side.  Not that that probably matters too much.

 

Thanks,

Tim

[Fossildude19]

Maybe Alokistocare harrisi ? 

Nice Trilobite.  

@piranha

[JohnBrewer]

@Kane among others will be able to help 

[piranha]

This unusual trilobite is not yet described from the Weeks Fm.  It could be a new species of Amecephalus.  

I sent the photo to a couple of colleagues for their feedback.  I will post any additional info when I receive it.

 

 

[piranha]

One colleague agrees on Amecephalus and another suggested affinities with Bolaspidella wellsvillensis.  

 

"The specimen looks like Bolaspidella wellsvillensis (Lochman and Denson, 1944) illustated by Robison in 1971.  The shape of the glabella with the ocular ridges projecting at 90 degrees from the frontal lobe, relatively small palpebral lobes, and strap-like posterior area of the fixigena all suggest that it is this species or at least closely related.  The pygidium is also similar, but this one is not quite preserved well enough for me to tell."

 

 

Robison & Babcock 2011 reassigned Bolaspidella wellsvillensis to a new species: Bolaspidella reesae.

 

figures of Bolaspidella reesae from:

 

Robison, R.A., & Babcock, L.E. (2011)
Systematics, paleobiology, and taphonomy of some exceptionally preserved trilobites from Cambrian Lagerstätten of Utah.
University of Kansas Paleontological Contributions, 5:1-47  LINK