Mesoceph Posted March 27, 2018 Share Posted March 27, 2018 As with my other posts so far, I should preface this post by saying that the Paleozoic, marine ecosystems, and invertebrates are not generally my primary expertise, so I apologize if I am wildly off base or asking stupid questions. Sadly, I did not find these specimens myself, and so I do not have any particularly useful information on age or location. They were left in a desk drawer along with a collection of other invertebrate fossils, most (if not all) of which are Paleozoic in age. They look to my untrained eye to be the same species of brachiopod, although I have no idea what species that is. Any taxonomic information beyond just "brachiopod" would be awesome. Here are the pictures. While photographing, I kept the specimens in the same order, so the one on the left/right is the same specimen in each picture. Thank you in advance for your time and input. Link to comment Share on other sites More sharing options...
Peat Burns Posted March 27, 2018 Share Posted March 27, 2018 I'm not very good without holding things in hand, but I'm thinking order Terebratulida or Pentamerida. If you can put it under magnification, Terebratulids have tiny little "pores" (punctate) over the surface of the shell. Let's see what others think. Link to comment Share on other sites More sharing options...
Mesoceph Posted March 27, 2018 Author Share Posted March 27, 2018 Thank you for your response! Under a hand lens (the only magnification I have at the moment, though I'll see about getting it under a microscope later in the week), I see some porous structure, but I am honestly not familiar enough with invertebrates to know if I am looking at original microstructure or something taphonomic in nature. What I'm seeing is picked up a little bit in the photographs, especially the left specimen in the 3rd photo and the right specimen in the 5th photo. Thank you again for taking the time to respond and for your thoughts! Link to comment Share on other sites More sharing options...
Peat Burns Posted March 27, 2018 Share Posted March 27, 2018 Glad to [try to] help! Here is a magnified image I took (under a dissecting scope) of a Terebratulid brachiopod showing the punctate surface. Does this resemble what you are seeing under magnification? Link to comment Share on other sites More sharing options...
Mesoceph Posted March 27, 2018 Author Share Posted March 27, 2018 Thank you for that! Your picture is much more clearly structured and organized than what I'm seeing, so I think what I am seeing might just be fine-scale pitting on the surface. It does, however, give me a really useful characteristic to watch for in the future now that I better know what to look for! If there was a punctate surface, then I think it has mostly been weathered away. I do see many closely spaced, curved lines running perpendicular to the plane of symmetry across the surface of the shell, which are the only preserved microstructure I can make out, but I'd be surprised if they are diagnostic. (There are also much more pronounced striations that run parallel to the plane of symmetry that are visible in some of the photos, just to clarify that those are not what I'm referring to.) Thanks so much for taking the time to post a picture! Even if I can't identify these brachiopods, I'm always happy to learn something new. Link to comment Share on other sites More sharing options...
MeargleSchmeargl Posted March 27, 2018 Share Posted March 27, 2018 It is a little difficult to make out distinguishing features in these images. Can you use more lighting and different, closer camera angles? Would help immensely for an ID. Also, do you know the original owner? If so, they might know a thing or two about the age of these specimens. Every single fossil you see is a miracle set in stone, and should be treated as such. Link to comment Share on other sites More sharing options...
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