Danielb Posted October 22, 2023 Share Posted October 22, 2023 (edited) Love this thread can’t wait to see what else you have! Edited October 22, 2023 by Danielb Link to comment Share on other sites More sharing options...
rew Posted October 23, 2023 Author Share Posted October 23, 2023 Trilobite #312 is a bonus trilobite. E is for Eccoptochile mariana of Middle Ordovician age from Jbel Tiskaouine, Morocco. Ecocoptochile is commonly faked. If you see a large, excellent Eccoptochile at a moderate price, is is very likely made in a mold, painted, and glued to a rock. This one has a bit of restoration, but is real. 1 4 Link to comment Share on other sites More sharing options...
rew Posted October 25, 2023 Author Share Posted October 25, 2023 Trilobite #313 is a bonus trilobite. E for for Eoharpes cristatus of Early Ordovician age from the Fezouata Formation at Zagora, Morocco. Good examples of this early harpetid don't come up very often. 1 3 Link to comment Share on other sites More sharing options...
piranha Posted October 25, 2023 Share Posted October 25, 2023 On 10/24/2023 at 10:54 PM, rew said: Eoharpes cristatus of Early Ordovician age from the Fezouata Formation at Zagora, Morocco. Eoharpes cristatus is a Portuguese trilobite. E. cristatus has a maximum of six to seven pits across the anterior width of the brim, and the prolongation of the cephalic brim does not extend beyond the pygidium. Some of the recent literature has referred these Fezouata harpetids to Eoharpes sp. and still awaiting a formal description. Unfortunately, this is yet another case of widespread misinformation propagated by various online fossil dealers. Romano, M. 1975 Harpid Trilobites from the Ordovician of North Portugal. Comunicações dos Serviços Geológicos de Portugal, 59:27-36 Romano, M., Henry, J.L. 1982 The Trilobite Genus Eoharpes from the Ordovician of Brittany and Portugal. Palaeontology, 25(3):623-633 PDF LINK Tauber, E.H., Reis, M.J. 1994 The Trilobite Eoharpes cristatus Romano, 1975 from the Valongo Formation (Ordovician) of North Portugal. Comunicações do Instituto Geológico e Mineiro, 80:35-49 PDF LINK 3 Link to comment Share on other sites More sharing options...
rew Posted October 26, 2023 Author Share Posted October 26, 2023 (edited) Okay, it's Eoharpes sp. for now. That's what the AMNH trilobite gallery calls it. They do have a question mark beside the name. So maybe this is an "E" trilobite, maybe it isn't. https://www.amnh.org/research/paleontology/collections/fossil-invertebrate-collection/trilobite-website/gallery-of-trilobites/ordovician-period-trilobites/ordovician-trilobites-of-morocco-africa-alphabetized Edited October 26, 2023 by rew 1 Link to comment Share on other sites More sharing options...
rew Posted October 27, 2023 Author Share Posted October 27, 2023 (edited) Trilobite of the week #314 is a main trilobite. E is for Erbenochile erbeni of Early Devonian age from Jbel Ou Driss, Morocco. This is a better than average specimen. The species is a member of the Acastidae with very large schizochroal eyes with readily visible lenses. Edited October 27, 2023 by rew 1 3 Link to comment Share on other sites More sharing options...
rew Posted October 29, 2023 Author Share Posted October 29, 2023 This week is brought to you by the letter F. There will be two bonus trilobites. Link to comment Share on other sites More sharing options...
rew Posted October 30, 2023 Author Share Posted October 30, 2023 Trilobite of the week #315 is a bonus trilobite. F is for Flexicalymene cf. granulosa of Late Ordovician age from the Nicolet River Formation in LaPrarie, Quebec. This bug is covered with tiny pustules. Flexicalymene granulosa comes from the Pulaski Shale in Oswego County, New York. This Canadian bug may or may not be the same species. 1 4 Link to comment Share on other sites More sharing options...
rew Posted November 1, 2023 Author Share Posted November 1, 2023 (edited) Trilobite of the week #316 is a bonus trilobite. F is for Foulonia sp. of Early Ordovician age from the Upper Fezouata Formation at the Zagora Area, Morocco. This is a natural double. The leading specimen is larger and the skinny pointy thing next to it is the rostrum of an ampyx trilobite. The trailing specimen is a bit better preserved and is right on top of another trilobite (which seems to be some sort of asaphid). Both bugs are prepped with all spines freed from the matrix. Edited November 1, 2023 by rew 1 4 Link to comment Share on other sites More sharing options...
rew Posted November 3, 2023 Author Share Posted November 3, 2023 Trilobite of the week #317 is a main trilobite. F is for Fallotaspis cf. bondoni of Early Cambrian age from the Issafen Formation at Tazemourt, Morocco. 1 4 Link to comment Share on other sites More sharing options...
rew Posted November 5, 2023 Author Share Posted November 5, 2023 This week is brought to you by the letter G. There will be two bonus trilobites. Link to comment Share on other sites More sharing options...
rew Posted November 6, 2023 Author Share Posted November 6, 2023 (edited) Trilobite #318 is a bonus trilobite. G is for Grandagnostus sp. of Late Middle Cambrian age from the Cassis or Agra Zone at Christmas Hills Road, Christmas Hills, Tasmania, Australia. This agnostid is my only trilobite from Tasmania. It is placed under the suborder Agnostina but not in any specific family because the head and pygidium are so effaced that has no features to place it into a family. There is, however, a "rim" around the head. Edited November 8, 2023 by rew 1 3 Link to comment Share on other sites More sharing options...
rew Posted November 8, 2023 Author Share Posted November 8, 2023 Trilobite #319 is a bonus trilobite. G is for Genevievella granulatus of Late Cambrian age from the Weeks Formation at Amasas Valley, Utah. This is my only trilobite in the family Llanoaspididae. 1 5 Link to comment Share on other sites More sharing options...
rew Posted November 10, 2023 Author Share Posted November 10, 2023 Trilobite of the week #320 is a main trilobite. G is for Gabriceraurus mifflinensis of Ordovician age (Blackriveran Stage) from the Mifflin Formation in Grant County, Wisconsin. A bit of shell in front of the right eye is missing, but there is no restoration. 1 5 Link to comment Share on other sites More sharing options...
rew Posted November 12, 2023 Author Share Posted November 12, 2023 This week is brought to you by the letter H. There will be two bonus trilobites. The three bugs are of three different orders and from three different continents. Link to comment Share on other sites More sharing options...
rew Posted November 13, 2023 Author Share Posted November 13, 2023 (edited) Trilobite of the week #321 is a bonus trilobite. H is for Hesslerides bufo of Mississippian age from the Edwardsville Formation in Montgomery County, Indiana. The Edwardsville Formation is famous for the variety, size, completeness, and excellence of its crinoid fossils. There are probably few serious crinoid collectors without some specimens from that formation. This plate does not disappoint -- there are four crinoid species here. The leftmost crinoid is Platycrinites hemisphericus, the upper right crinoid is the crown of a Scytalocrinus robustus, in the lower left of the plate to the right of the Platycrinites there is a Scytalocrinus decadactylus, and in the lower right is a Cyathocrinites multibrachiatus. There is also a small Cladochonus beecheri coral. But the stars of the show are the Hesslerides bufo trilobites, the only species of trilobite I know of from the Edswardsville Formation. There are five specimens here. Three are train wrecks -- two partials with heads and one enrolled and crushed specimen. One prone specimen, next to the coral, is near perfect and another is of good quality, with its head bent down and slight disarticulation of the free cheeks. These trilobites lived at time when crinoids were at their peak of diversity, but trilobites were on their way out. Compare with its cousin, Hesslerides arcentensis, which was trilobite of the week #226 posted May 1, 2022. Edited November 13, 2023 by rew 1 5 Link to comment Share on other sites More sharing options...
piranha Posted November 13, 2023 Share Posted November 13, 2023 4 hours ago, rew said: Hesslerides bufo trilobites, the only species of trilobite I know of from the Edswardsville Formation. Congrats on this spectacular association plate from one of the preeminent collectors of Indiana trilobites. These are the other Edwardsville Formation trilobites. The name "Basidechenella" needs to be updated as it is not a valid genus for North America. Brezinski, D.K. 2007 Lower Mississippian Trilobite Biostratigraphy of the Central United States, and some New Osagean Species. Journal of Paleontology 81(4):737-745 White, R.D., Lieberman, B.S. 1998 A Type Catalog of Fossil Invertebrates (Arthropoda: Trilobita) in the Yale Peabody Museum. Postilla, 214:1-152 2 Link to comment Share on other sites More sharing options...
rew Posted November 13, 2023 Author Share Posted November 13, 2023 Well, I always learn something new from piranha. There are more different species of Edwardsville trilobites than I thought. I'd love to have one of those Brachymetopus spinosus trilobites, but I doubt I ever will. Link to comment Share on other sites More sharing options...
rew Posted November 15, 2023 Author Share Posted November 15, 2023 Trilobite of the week #322 is a bonus trilobite. H is for Hoplolichoides furcifer, of Middle Ordovician age, from the Asery level of Vilpovitsy quarry, in the St. Petersburg region of Russia. There is a fair amount of variation in this species. The size of the axial spines and the thoracic segments they are on varies. The occipital spine can be bifurcated into "goat's horns", as it is here, or there can be a single central occipital spine. Everybody likes this bug. 1 3 Link to comment Share on other sites More sharing options...
Coco Posted November 15, 2023 Share Posted November 15, 2023 Hi, Is it normal for her eyes to be like this ? Coco ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici Mâchoires sélaciennes récentes : ici Hétérodontiques et sélaciens : ici Oeufs sélaciens récents : ici Otolithes de poissons récents ! ici Un Greg... Link to comment Share on other sites More sharing options...
rew Posted November 15, 2023 Author Share Posted November 15, 2023 34 minutes ago, Coco said: Hi, Is it normal for her eyes to be like this ? Coco Yes. With Russian bugs it is common for the optical surfaces of the holochroal eyes of lichids to not be preserved at all. So what you see is rock. 1 Link to comment Share on other sites More sharing options...
Isotelus2883 Posted November 15, 2023 Share Posted November 15, 2023 The schizochroal eyes on the reconstructed specimens are all faked. Lichids do not have schizochroal eyes. This style of reconstruction is very common among this species. 3 hours ago, Coco said: Is it normal for her eyes to be like this ? 1 Link to comment Share on other sites More sharing options...
rew Posted November 17, 2023 Author Share Posted November 17, 2023 Trilobite of the week #323 is a main trilobite. H is for Heliopeltis johnsoni, at the age of the Early to Middle Devonian transition (Emsian/Eifelian stage), from Jebel Ofaten, Morocco. This ball of spines is a scutellid trilobite, from the same group that has Paralejurus. To see where it came from, start with a Kolihapeltis. That scutellid is already a strange looking trilobite, in large part because the left and right pleural lobes are thinned out to the point where they are spines, so only the central lobe is contiguous. Now thin out the pygidium of the Kolihapeltis until it becomes a spine itself, make all the spines a little longer, and you have a Heliopeltis. If you want to see the lenses of a holochroal eye, your best bet is to get a well preserved and prepared scutellid trilobite. My Paralejurus trilobite has well preserved lenses, and so does this bug. I suspect this bug had trouble hauling around all those spines. It any case I don't believe there are any species descended from it. 2 7 Link to comment Share on other sites More sharing options...
Top Trilo Posted November 17, 2023 Share Posted November 17, 2023 What a stunning trilobite! 1 “If fossils are not "boggling" your mind then you are simply not doing it right” -Ken (digit) "No fossil is garbage, it´s just not completely preserved” -Franz (FranzBernhard) "With hammer in hand, the open horizon of time, and dear friends by my side, what can we not accomplish together?" -Kane (Kane) "We are in a way conquering time, reuniting members of a long lost family" -Quincy (Opabinia Blues) "I loved reading the trip reports, I loved the sharing, I loved the educational aspect, I loved the humor. It felt like home. It still does" -Mike (Pagurus) “The best deal I ever got was getting accepted as a member on The Fossil Forum. Not only got an invaluable pool of knowledge, but gained a loving family as well.” -Doren (caldigger) "it really is nice, to visit the oasis that is TFF" -Tim (fossildude19) "Life's Good! -Adam (Tidgy's Dad) Link to comment Share on other sites More sharing options...
rew Posted November 18, 2023 Author Share Posted November 18, 2023 15 hours ago, Top Trilo said: What a stunning trilobite! I certainly thought so. It's one of those extreme endpoints of evolution, taking a body plan as far as it can go. Link to comment Share on other sites More sharing options...
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