rew Posted March 20, 2019 Author Share Posted March 20, 2019 I can't resist adding this one extra super bonus trilobite, the rare and much larger (and cuddlier) subspecies Greenops boothi plushtoyi. This is only found in a thin layer in Ithaca, New York. 4 2 Link to comment Share on other sites More sharing options...
Malcolmt Posted March 20, 2019 Share Posted March 20, 2019 That is awesome.... a well known member of the Fossil Forum that I helped out a few years ago gave my grand daughter one of these and it is still one of her favorites. Because of this Trilobite was one of her first 50 words...... She is now sharing it with her new baby sister......... 1 1 Link to comment Share on other sites More sharing options...
GerryK Posted March 20, 2019 Share Posted March 20, 2019 11 hours ago, rew said: This midweek bonus trilobite (#24) is a more common cousin of Bellacartwrightia, Greenops boothi, from the Moscow Shale of Erie County, New York. It is middle Devonian in age. This specimen, 27 mm long, is typical size for the species. It shares its rock with a piece of horn coral, a reminder that back in the Devonian upstate New York was a shallow tropical sea, south of the equator. This trilobite is a Greenops barberi, not a Greenops boothi 2 Link to comment Share on other sites More sharing options...
DevonianDigger Posted March 20, 2019 Share Posted March 20, 2019 11 hours ago, rew said: I can't resist adding this one extra super bonus trilobite, the rare and much larger (and cuddlier) subspecies Greenops boothi plushtoyi. This is only found in a thin layer in Ithaca, New York. That's not true, we also have them at Penn Dixie. $15 a piece, they're found in the Gift Shop member of the Windom, lol. 1 Jay A. Wollin Lead Fossil Educator - Penn Dixie Fossil Park and Nature Reserve Hamburg, New York, USA Link to comment Share on other sites More sharing options...
sharkdoctor Posted March 20, 2019 Share Posted March 20, 2019 Great thread and a great project idea! I can't wait for the next installment! Link to comment Share on other sites More sharing options...
rew Posted March 20, 2019 Author Share Posted March 20, 2019 3 hours ago, GerryK said: This trilobite is a Greenops barberi, not a Greenops boothi The difference between those two species appears to be primarily in the length of the pygidal lappets, with G. boothi having them longer. It isn't clear to me where my specimen lies. Link to comment Share on other sites More sharing options...
rew Posted March 20, 2019 Author Share Posted March 20, 2019 7 hours ago, DevonianDigger said: That's not true, we also have them at Penn Dixie. $15 a piece, they're found in the Gift Shop member of the Windom, lol. I stand corrected. Greenops boothi plushtoyi has a wider distribution than was previously reported in the literature. Link to comment Share on other sites More sharing options...
piranha Posted March 20, 2019 Share Posted March 20, 2019 5 hours ago, rew said: The difference between those two species appears to be primarily in the length of the pygidal lappets, with G. boothi having them longer. It isn't clear to me where my specimen lies. Greenops boothi: terminal pygidial lappet broad anteriorly, subrectangular, convex posteriorly Greenops barberi: terminal pygidial lappet developed as narrow (tr.) sharply pointed triangle Lieberman, B.S., Kloc, G.J. 1997 Evolutionary and biogeographic patterns in the Asteropyginae (Trilobita, Devonian) Delo, 1935. American Museum of Natural History Bulletin, 232:1-127 PDF LINK 2 Link to comment Share on other sites More sharing options...
rew Posted March 21, 2019 Author Share Posted March 21, 2019 When I read that paper I have to concede that my bug comes a little closer to G. barberi. But when I look at various alleged G. boothi and G. barberi specimens on the internet, there's very little consistency. Link to comment Share on other sites More sharing options...
GerryK Posted March 21, 2019 Share Posted March 21, 2019 There is much confusion on the internet about Greenops and some of the identifications are not reliable. There are only 2 species of Greenops in Western New York, G. grabaui in the Wanakah Shale and G. barberi in the Windom Shale. As one goes eastward in NY the stratigraphy changes dramatically. The Hamilton Group thickens and many more units are present and multiple species of Greenops occur there. Greenops boothi does occur in NY but only in Eastern NY in an unnamed unit between the Kashon Shale and the Windom Shale. 5 Link to comment Share on other sites More sharing options...
DevonianDigger Posted March 21, 2019 Share Posted March 21, 2019 1 hour ago, GerryK said: There is much confusion on the internet about Greenops and some of the identifications are not reliable. There are only 2 species of Greenops in Western New York, G. grabaui in the Wanakah Shale and G. boothi in the Windom Shale. As one goes eastward in NY the stratigraphy changes dramatically. The Hamilton Group thickens and many more units are present and mutable species of Greenops occur there. Greenops does occur in NY but only in Eastern NY in an unnamed unit between the Kashon Shale and the Windom Shale. Where does the G. barberi fit into the equation then? Jay A. Wollin Lead Fossil Educator - Penn Dixie Fossil Park and Nature Reserve Hamburg, New York, USA Link to comment Share on other sites More sharing options...
GerryK Posted March 21, 2019 Share Posted March 21, 2019 9 minutes ago, DevonianDigger said: Where does the G. barberi fit into the equation then? Sorry, thanks for pointing out my error. Corrections are made and now it's OK. 1 Link to comment Share on other sites More sharing options...
rew Posted March 23, 2019 Author Share Posted March 23, 2019 Trilobite #25, the official Trilobite of the Week, is another member of the Acastidae, this one of Eifelian age from Jebel Issoumour, Morocco -- Morocconites malladoides. I'm pretty sure I got the species right this time because it's the only one in the genus. This one is famous for the upturned rostrum. The right eye isn't perfectly preserved but the lenses that are there are easy to see, as is typical of the schizochroal eyes found in the Phacopina. 3 Link to comment Share on other sites More sharing options...
ynot Posted March 24, 2019 Share Posted March 24, 2019 You sure do have a nice "bug" collection. Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
DevonianDigger Posted March 24, 2019 Share Posted March 24, 2019 Some very nice pieces indeed! Jay A. Wollin Lead Fossil Educator - Penn Dixie Fossil Park and Nature Reserve Hamburg, New York, USA Link to comment Share on other sites More sharing options...
rew Posted March 28, 2019 Author Share Posted March 28, 2019 Now to squeeze in some mid-week trilobites before the middle of the week is gone. Both of these are Moroccan Devonian phacopidae. Trilobite #26 Reedops cephalotes, is from the early Devonian (Pragian stage) and was found in the Ihandar Formation of Jebel Issoumour, Morocco. Link to comment Share on other sites More sharing options...
rew Posted March 28, 2019 Author Share Posted March 28, 2019 Trilobite #27 is the middle Devonian Pedinopariops sp. from Djebel Ou Driss, Morocco. At least I think it's a Pedinopariops, the various phacopidae with pustulose glabellas are quite similar to one another. I don't know the species. Link to comment Share on other sites More sharing options...
rew Posted March 29, 2019 Author Share Posted March 29, 2019 Now for the official trilobite of the week, #28. This bug was undescribed when I bought it and so far as I know it is still undescribed. It is an early Devonian acastid from Jebel Issoumour, Morocco that appears to be related to Morocconites. It is smaller -- the Morocconites malladoides that was last week's trilobite of the week is 7.5 cm long, typical for the species; this bug is about 4.2 cm long, and seems to be typical for its species, although I can't be sure because I've only seen one other specimen for sale. (This bug seems to be fairly rare.) The rostrum is straight and needle-like rather than curved upwards, and is a longer proportion of the total body length. Link to comment Share on other sites More sharing options...
rew Posted April 4, 2019 Author Share Posted April 4, 2019 It's time for the midweek bonus trilobite, #29. This is a nice natural double of early Devonian age from the Haragan Formation of Coal County, Oklahoma, Paciphacops campbelli. Here we see both bugs and close ups of the two bugs. Link to comment Share on other sites More sharing options...
rew Posted April 4, 2019 Author Share Posted April 4, 2019 Here's the right eye of the trilobite on the right side of the plate. Link to comment Share on other sites More sharing options...
rew Posted April 5, 2019 Author Share Posted April 5, 2019 Now for trilobite #30, the official trilobite of the week. This is a natural double, Basseiarges mellishae, a small early Devonian lichid from Jorf, Morocco. The close up here is of the left specimen. 1 Link to comment Share on other sites More sharing options...
rew Posted April 5, 2019 Author Share Posted April 5, 2019 Here is the other trilobite on the plate. The eyes are just barely visible as slightly raised bumps on the very front of the head, well separated from the edges of the glabella. Link to comment Share on other sites More sharing options...
rew Posted April 13, 2019 Author Share Posted April 13, 2019 This week's trilobite of the week is #31, Modocia typicalis, of Middle Cambrian age and from the Marjum Formation in the House Range of Utah. This is a large (2") specimen. The trilobite has no repair crack, so how did the preparator know to dig deep into the rock to find it? The trilobite was found ventrally, a flat rock was glued to the ventral side to back it, and then the trilobite was prepared dorsally. I'm starting to see more bugs with this type of preparation. 1 Link to comment Share on other sites More sharing options...
ReptileTooth Posted April 13, 2019 Share Posted April 13, 2019 Wow, that's deep! Maybe it has been scanned? It's a great collection, all those trilobites so well preserved. "The baneful Dragons, O Seas, are gone: Fiends, 0 Earth, have filled thee with the bones of Defeat and Death." Link to comment Share on other sites More sharing options...
rew Posted April 13, 2019 Author Share Posted April 13, 2019 If you have the specimen in hand you can easily see that there are two parallel slabs of rock glued together, with the trilobite at the level where the seam is. So it was clearly found ventrally. I have one other bug prepared this way, and have seen a couple of other examples not in my collection.; Link to comment Share on other sites More sharing options...
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