Jump to content

Recommended Posts

Ryann10006

Hello everyone, I found this large trilobite pygidium today which is the largest piece of trilobite I have ever found in the area, the pygidium measuring nearly 2 inches long. Judging by the trilobits I usually find I think the area is Devonian as I have trilobits I've previously found I believe are from eldregops and greenops. The problem with this site is it's imported material from somewhere in upstate new york so I'm not 100% percent sure. Though I believe it's devonian I don't know of any species with a pygidium this size personally so would anymore with more expertise help me find an ID of what species this can belong to, I'd love to know since I can't see myself coming across another one of these in the tiny area I get to look in.:trilo:

IMG_20180722_225556119.jpg

IMG_20180722_225620167.jpg

IMG_20180722_225610827.jpg

Share this post


Link to post
Share on other sites
Fossildude19

I took the liberty of cropping and contrasting a few of your photos. 

 

 

IMG_20180722_225556119.jpg.ad8458f4384c2980e4edc2886496ccaa.jpg    IMG_20180722_225620167.jpg.758db774eb21cd8449e01c57c950ccf4.jpg

 

Maybe @piranha  will know. 

 

Share this post


Link to post
Share on other sites
MRfossilMISTER

hmmmm.. maybe clean it off a bit? it could clear it up so we can see better :hammer01: :trilowalk:

Share this post


Link to post
Share on other sites
Fossildude19
1 hour ago, MRfossilMISTER said:

hmmmm.. maybe clean it off a bit? it could clear it up so we can see better :hammer01: :trilowalk:

Doesn't seem like there is much left there to clean. :( 

Share this post


Link to post
Share on other sites
MRfossilMISTER

well it could help possibly, i cant make out much :blink:

Share this post


Link to post
Share on other sites
Ryann10006
1 hour ago, GerryK said:

Your pygidium looks like a Dalmanitacea (superfamily) from the Lower Devonian. Two possible families are Dalmanitidae and Synphoriidae. It looks more like a Synphoriidae than a Dalmanitidae because the pygidium is wider and shorter than a Dalmanitidae. A possible genus could be Synphoria.

 

 @GerryK Thank you very much for pointing me in the right direction! I was hardly able to find any images of one except for one of Synphoria stemmata stemmata, but I can see what you mean, it seems like I can safely label this as Synphoridae sp. since it'll likely be impossible to narrow down the specific species.

Share this post


Link to post
Share on other sites
piranha

for comparison: Synphoria

 

Delo, D.M. 1940

Phacopid trilobites of North America.

Geological Society of America Special Papers, 29:1-135

 

image.thumb.png.b2a7ee25f1d3915f248006f3b84ff66a.png

Share this post


Link to post
Share on other sites
Ryann10006

@piranha Thank you for the excerpt! very helpful.

Share this post


Link to post
Share on other sites
piranha

Glad to assist!  Here are some additional papers:

 

Lesperance, P.J. & Bourque, P.A. 1971
The Synphoriinae: An evolutionary pattern of Lower and Middle Devonian trilobites.
Journal of Paleontology, 45(2):182-208

 

Lesperance, P.J. 1975
Stratigraphy and paleontology of the Synphoriidae (Lower and Middle Devonian dalmanitacean trilobites).

Journal of Paleontology, 49(1):91-137

Share this post


Link to post
Share on other sites
piranha

The update from another specialist friend is dalmanitid:

 

 

Q: This one is from New York.  Some of the material is transported fill, so we are not certain if this is lower or middle Devonian.  Is it a better fit for a dalmanitid or a synphoriid?  Which genus would you assign it to?  

 

A: Based on the form of the pleural furrows and ribs it’s definitely dalmanitid, not synphoriid.  Genera of these Devonian dalmanitids are in most cases based on cephalic characters so without a cephalon the genus is unfortunately indeterminate.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Recently Browsing   0 members

    No registered users viewing this page.

×