Odontopleurid.

[Tidgy's Dad]

I found this in a road cut about forty years ago. 

But in all the time since, the labels and my memory have become mixed up or lost.

I remember it as 'Acidaspis' but that was only my name for it at the time, I didn't do much research. 

 

It was either in the Llanvirn shales (Middle Ordovician) or the Wenlock Shales (Middle Silurian) of Shropshire, UK, but again I can't remember precisely where and the label is lost. 

Seems to be the pygidium and about half the thorax. 2 cm wide, spines included and 1.5 cm long with the spines.  

(still doing a little more prepping).

Thanks for any help.

 

[piranha]

Formerly Acidaspis then Leonaspis before getting reclassified as: Exallaspis coronata (Salter 1853)

 

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(4):333-371  PDF LINK

[Tidgy's Dad]

1 hour ago, piranha said:

Formerly Acidaspis then Leonaspis before getting reclassified as: Exallaspis coronata (Salter 1853)

 

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(4):333-371  PDF LINK

Brilliant as usual. Thank you. 

Oh, well, I suppose I was sort of right as a child.