Silurian Trilobites ID help needed, Ontario, Canada

[crinus]

I found these two trilobites in an old collection and need some help.  They are both labeled as Silurian from Glenridge Quarry at St Catharines, Ontario.  They are listed as Gasport Formation.  Before anyone gets too upset, they were collected pre 1991  as that is the date it was cataloged.  So when these were collected, the site was either an active quarry or a garbage dump and not the park it is today.   The first trilobite is obviously a Calymene.  If anyone knows the species that would be appreciated.  The second trilobite is what has be stumped.  No clue as to what it is.  It is just labeled as unknown with the locality information.  Any clue out there???

Joe

[Peat Burns]

Could the second one be a Ktenoura sp? Or maybe Xylabion sp?

 

@piranha

[Tidgy's Dad]

i would venture Calymene breviceps is a possibility for the first one and pretty sure that's Ktenoura for the second. 

hmm, or C. niagerensis? 

[piranha]

The cheirurid compares well with Hadromeros niagarensis.  As far as I know, the calymenid is still undescribed. 

The attached example also from St Catharines shares similarities with Calymene platys from the lower-mid Devonian.

 

    

[piranha]

1 hour ago, Peat Burns said:

Could the second one be a Ktenoura sp? Or maybe Xylabion sp?

11 minutes ago, Tidgy's Dad said:

i would venture Calymene breviceps is a possibility for the first one and pretty sure that's Ktenoura for the second. 

hmm, or C. niagerensis? 

 

 

 Calymene breviceps occurs only in the Waldron Shale of Indiana and Tennessee.  Ktenoura is a European genus, Ceraurinella sp. (="Xylabion") is Ordovician.

[crinus]

piranha, when it comes to trilobites you sure know your stuff.  Thanks all for the effort, but I think piranha hit a homer.

 

Joe

[piranha]

1 hour ago, crinus said:

piranha, when it comes to trilobites you sure know your stuff.  Thanks all for the effort, but I think piranha hit a homer.

Joe

 

 

Thanks, Joe!  I have been searching for some other Silurian calymenids.  There are a couple of similar tuberculate specimens in "Trilobites of New York".

 

Hopefully, GerryK will also weigh in on this one.