blackmoth Posted February 28, 2019 Share Posted February 28, 2019 form the late carb/early permian statum in Shanxi, China. The coil does remsemble an evolute nautilus, but it is only 6mm in diameter. I guess ome could not say it is a young nautilus or something, as the conch is hard material , and old part can could not change with growth. too big for fusulina. and not like a gastropod either. 2 Link to comment Share on other sites More sharing options...
BobWill Posted February 28, 2019 Share Posted February 28, 2019 I think you mean Nautiloid since Nautilus in an extant genus. In answer to tour question, I don't know any that small but this fossil is not preserved well enough to say it's a nautiloid for sure unless it is from a site with known fauna and very little diversity. I don't see any reason it could not be a planispiral gastropod or an ammonoid like Xenodiscus waageni which would be small enough. 3 Link to comment Share on other sites More sharing options...
Fossildude19 Posted February 28, 2019 Share Posted February 28, 2019 This is a small Devonian goniatite, Tornoceras uniangulare. That said, I can't make out any suture lines on your item. It could very well be a gastropod. Enlarged, cropped and brightened: 2 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
Rockwood Posted February 28, 2019 Share Posted February 28, 2019 Here is an illustration of the scale at which a gastropod shell begins to form. wiki 2 Link to comment Share on other sites More sharing options...
Manticocerasman Posted February 28, 2019 Share Posted February 28, 2019 Nautiloids can be that small, but in my opinion this is a Straparollid or Euomphalid gastropod. 3 growing old is mandatory but growing up is optional. Link to comment Share on other sites More sharing options...
Ludwigia Posted February 28, 2019 Share Posted February 28, 2019 I agree with Manticocerasman. 1 Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
BobWill Posted February 28, 2019 Share Posted February 28, 2019 15 hours ago, Fossildude19 said: This is a small Devonian goniatite, Tornoceras uniangulare. That said, I can't make out any suture lines on your item. It could very well be a gastropod. Enlarged, cropped and brightened: Right size but too involute. 14 hours ago, Rockwood said: Here is an illustration of the scale at which a gastropod shell begins to form. wiki Small enough but this fossils has so many whorls. I agree that it most likely is some planispiral gastropod. 1 Link to comment Share on other sites More sharing options...
Fossildude19 Posted February 28, 2019 Share Posted February 28, 2019 7 minutes ago, BobWill said: Right size but too involute. I was merely illustrating that ammonoids could be small. 1 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
Rockwood Posted February 28, 2019 Share Posted February 28, 2019 In general, it's much easier to be small. 1 Link to comment Share on other sites More sharing options...
blackmoth Posted March 1, 2019 Author Share Posted March 1, 2019 On 2019/2/28 at 3:42 PM, Manticocerasman said: Nautiloids can be that small, but in my opinion this is a Straparollid or Euomphalid gastropod. This is a 1937 report of the gastropods of the same area, same stratum. The specimen are bigger though ( largest is about 30mm, while the bigger one I have is only 1mm across) . Link to comment Share on other sites More sharing options...
Manticocerasman Posted March 1, 2019 Share Posted March 1, 2019 16 minutes ago, blackmoth said: This is a 1937 report of the gastropods of the same area, same stratum. The specimen are bigger though ( largest is about 30mm, while the bigger one I have is only 1mm across) . I've seen specimens of those up to 60mm across in the carboniferous layers in my area, but also smaller juvenile ones not bigger than a few mm. growing old is mandatory but growing up is optional. Link to comment Share on other sites More sharing options...
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