rew Posted February 20, 2019 Author Share Posted February 20, 2019 Bonus trilobite #14 The Moroccan Cyphaspis boutscharafinense. 5 1 Link to comment Share on other sites More sharing options...
rew Posted February 20, 2019 Author Share Posted February 20, 2019 Trilobite #15 Another Devonian bug of the same genus, Cyphaspis eberhardiei from the Timrhanhart Formation of Foum Zguid, Morocco. This one looks like it's on the runway ready to take off. 6 2 Link to comment Share on other sites More sharing options...
Bobby Rico Posted February 20, 2019 Share Posted February 20, 2019 Wow that is a stunning collection you have . Thanks for sharing Link to comment Share on other sites More sharing options...
rew Posted February 23, 2019 Author Share Posted February 23, 2019 Here is trilobite #16, the official trilobite of this week, and I'm not exactly sure what it is. It is a Middle Devonian pustulose scutellid from Jebel El Mrakib, Morocco. It was sold as an undetermined species within the Goldius genus, which according to Sam Gon's trilobites.info site is a junior synonym of the Scutellum genus. So maybe it's an undetermined species of Scutellum. What this isn't is Metascutellum pustulatum; that species has an indentation partway up the center section of the pygidium that this specimen lacks. If there are any scutellid experts out there who can pin this down better please speak up. It is certainly a very fine example of whatever it is. Like all trilobites in the order Corynexochida this has holochroal eyes (a single cornea over all the lenses). Nevertheless the lenses are well preserved. They are a bit too small to be seen with the naked eye but are readily seen with the aid of a naked magnifying macro lens. 5 2 Link to comment Share on other sites More sharing options...
Wrangellian Posted February 23, 2019 Share Posted February 23, 2019 You have amassed an amazing collection of trilos. How many more to go? How long did it take you to collect what you've got so far? Link to comment Share on other sites More sharing options...
rew Posted February 23, 2019 Author Share Posted February 23, 2019 We've hardly begun. Posting the bugs here gives me an incentive to get my trilobites photographed. (I have other, non-trilobite fossils too, including a few in the "awesome" category, but they'll have to go in another thread.) One advantage of posting them here is that any errors in identification or in other statements made about them have a fair chance of being corrected. I've been collecting trilobites for about 7 years. Link to comment Share on other sites More sharing options...
piranha Posted February 24, 2019 Share Posted February 24, 2019 19 hours ago, rew said: Here is trilobite #16, the official trilobite of this week, and I'm not exactly sure what it is. It is a Middle Devonian pustulose scutellid from Jebel El Mrakib, Morocco. It was sold as an undetermined species within the Goldius genus, which according to Sam Gon's trilobites.info site is a junior synonym of the Scutellum genus. So maybe it's an undetermined species of Scutellum. What this isn't is Metascutellum pustulatum; that species has an indentation partway up the center section of the pygidium that this specimen lacks. If there are any scutellid experts out there who can pin this down better please speak up. It is certainly a very fine example of whatever it is. Bronteus pustulatus Barrande 1846 was reclassified as Metascutellum pustulatum Šnajdr 1960 (median pygidial rib distinctly bifurcate) Šnajdr, M. 1960 Studie o celedi Scutelluidae (Trilobitae). [A study of the family Scutelluidae (Trilobita).] Rozpravy Ústředního Ústavu Geologického, 26:1-280 Here is the response from a colleague that specializes in the Scutelluidae: The specimen belongs to Scutellum. There are some similar specimens from Morocco illustrated on the internet as Scutellum pustulatum, but other specimens illustrated on the internet under this name are not conspecific or even congeneric. Also, there are possible taxonomic problems with that name. It was proposed by a German worker Anne Archinal in 1994, but it may be a junior homonym of a name by Barrande (1846). figures from: Archinal, A. 1994 Zur Morphologie, Systematik, Stratigraphie und Okologie der Gattung Scutellum (Trilobita; Devon). [On the morphology, systematics, stratigraphy and ecology of the genus Scutellum (Trilobita, Devonian).] Senckenbergiana Lethaea, 74:291-324 5 Link to comment Share on other sites More sharing options...
rew Posted February 24, 2019 Author Share Posted February 24, 2019 Okay, so Scutellum genus it is. And either S. pustulatum or something very close to that. Link to comment Share on other sites More sharing options...
rew Posted February 28, 2019 Author Share Posted February 28, 2019 What's a weekend "Trilobite of the Week" without some midweek bonus trilobites? Here is trilobite #17, Asaphus lepidurus, a relatively common asaphid from the Putilovo quarry in the St. Petersburg region of Russia. 6 2 Link to comment Share on other sites More sharing options...
rew Posted February 28, 2019 Author Share Posted February 28, 2019 Trilobite #18 is Asaphus cornutus, from the Vilpovitsy quarry of the St. Petersburg region of Russia. The eyes of this trilobite are a bit raised compared to A. lepidurus. These Russian bugs are sometimes placed in the genus Neoasaphus rather than Asaphus. I'm interested in any informed opinion as to which is the preferred genus. 5 1 Link to comment Share on other sites More sharing options...
Ludwigia Posted February 28, 2019 Share Posted February 28, 2019 Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
rew Posted March 2, 2019 Author Share Posted March 2, 2019 Here is the official trilobite of the week, trilobite #19. It is a classic Silurian lichid from the Rochester Shale of upstate New York, Arctinurus boltoni: 4 1 Link to comment Share on other sites More sharing options...
rew Posted March 11, 2019 Author Share Posted March 11, 2019 Well, I had a busy week, so no mid-week bonus trilobites this time. This trilobite of the week is #20, an undetermined species of Cyclopyge, from the Ktaoua Formation of El Kaid Errami, Morocco, of early Ordovician age. This small trilobite is all about its bulbous head with enormous eyes. And despite the relatively poor quality of shell preservation, most of the lenses are visible. 5 Link to comment Share on other sites More sharing options...
Wrangellian Posted March 11, 2019 Share Posted March 11, 2019 Wow... (Spelling correction: Ktaoua) Link to comment Share on other sites More sharing options...
rew Posted March 11, 2019 Author Share Posted March 11, 2019 Spelling fixed. Link to comment Share on other sites More sharing options...
rew Posted March 12, 2019 Author Share Posted March 12, 2019 Okay, I make up for last week by having two early middle of the week bonus trilobites. Both are small trilobites, each about 12 mm long, both are of Middle Cambrian age, both are in the order Ptychopariida, and both are from the Western United States. Trilobite #21 is Piochaspis sellata from the Chisholm Shale in Pioche, Nevada. Trilobite #22 is Bolaspidella drumensis from the Pierson Cove Formation in Millard County, Utah. The Piochaspis is a fairly ordinary bug, the Bolaspidella features a pustulose head, an occipital spine, and several axial spines. 5 1 Link to comment Share on other sites More sharing options...
rew Posted March 17, 2019 Author Share Posted March 17, 2019 The new trilobite of the week is trilobite #23, Bellacartwrightia whiteleyi. This Middle Devonian Acastid comes from the Windom Shale of Hamburg, New York. It has axial nodes. While it doesn't quite have an occipital spine, at least it has an occipital point. 4 2 Link to comment Share on other sites More sharing options...
DevonianDigger Posted March 17, 2019 Share Posted March 17, 2019 19 minutes ago, rew said: The new trilobite of the week is trilobite #23, Bellacartwrightia whiteleyi. This Middle Devonian Acastid comes from the Windom Shale of Hamburg, New York. It has axial nodes. While it doesn't quite have an occipital spine, at least it has an occipital point. If this example is truely from the Windom member, then it should be labeled as Bellacartwrightia sp. This species has not yet been described. The B. whiteleyi is described only from the Wanakah member, below the Tichenor LS. The Bellacartwrightia sp. from the Windom was deemed to have enough differences to be classified as a different species. I'm currently in the process of trying to collect enough examples to have it properly described. Regardless, this is one of the nicer examples I have seen. In fact, if you feel so inclined, would you mind sending me some more photographs of this one along with your info so that I can include it in my collection of info? 3 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...
Tidgy's Dad Posted March 17, 2019 Share Posted March 17, 2019 Some truly beautiful trilobites. Love #20, great eyes! Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
Malcolmt Posted March 17, 2019 Share Posted March 17, 2019 9 hours ago, DevonianDigger said: If this example is truely from the Windom member, then it should be labeled as Bellacartwrightia sp. This species has not yet been described. The B. whiteleyi is described only from the Wanakah member, below the Tichenor LS. The Bellacartwrightia sp. from the Windom was deemed to have enough differences to be classified as a different species. I'm currently in the process of trying to collect enough examples to have it properly described. Regardless, this is one of the nicer examples I have seen. In fact, if you feel so inclined, would you mind sending me some more photographs of this one along with your info so that I can include it in my collection of info? Hopefully we will be finding some for ourselves this season. FYI I am planning being there the Friday through Monday of the Dig With The Experts Weekend. Link to comment Share on other sites More sharing options...
DevonianDigger Posted March 17, 2019 Share Posted March 17, 2019 @Malcolmt it's my understanding that you will be one of our experts this year! 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...
Malcolmt Posted March 17, 2019 Share Posted March 17, 2019 Yes I am going in disguise as one, I think he just wanted my saw and big prybars there. Should be fun but sticking around Fri and Monday (Mon depending on Weather) so I can get in a bit of digging time for myself. If anyone else is going I will be the homeless looking guy in the Jurassic park hat and Fossil Forum Tee Shirt on the Friday.. Hope to see a few of you there. Get your tickets NOW!!!! for the Saturday and Sunday Dig.. Space is limited and they are selling out fast. Link to comment Share on other sites More sharing options...
DevonianDigger Posted March 17, 2019 Share Posted March 17, 2019 8 minutes ago, Malcolmt said: Yes I am going in disguise as one, I think he just wanted my saw and big prybars there. Should be fun but sticking around Fri and Monday (Mon depending on Weather) so I can get in a bit of digging time for myself. If anyone else is going I will be the homeless looking guy in the Jurassic park hat and Fossil Forum Tee Shirt on the Friday.. Hope to see a few of you there. Get your tickets NOW!!!! for the Saturday and Sunday Dig.. Space is limited and they are selling out fast. In fact, there are only around 30 tickets left for Sat or Sun. But let's not hijack this awesome thread, lol. 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...
Malcolmt Posted March 17, 2019 Share Posted March 17, 2019 Perhaps make a Dig with The Experts Thread 2019 and consolidate stuff there. Link to comment Share on other sites More sharing options...
rew Posted March 20, 2019 Author Share Posted March 20, 2019 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. 2 2 Link to comment Share on other sites More sharing options...
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