gigantoraptor Posted March 14, 2020 Share Posted March 14, 2020 Hello all I was wondering if any of you could identify this very tiny (1mm) ammonite sitting on top of some Dactylioceras athleticum from the Jurassic of Schlaifhausen, Germany. Can this be a juvenile stage of the same species? I know nothing about the different lifestages of ammonites. Looking forward to your answers. Edit: does someone knows the size of the smallest ammonite recorded? 2 Link to comment Share on other sites More sharing options...
Fossildude19 Posted March 14, 2020 Share Posted March 14, 2020 Probably a microchonchid, rather than an ammonite. 3 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...
Tidgy's Dad Posted March 14, 2020 Share Posted March 14, 2020 Some tiny ammonites have been found that are less than a mm across in their juvenile stages, but I agree with Tim that this could be something else, though microconchids were becoming more unusual by this time before their extinction in the Middle Jurassic. An early serpulid worm tube or even a foram may also be possibilities, perhaps. 4 Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
piranha Posted March 14, 2020 Share Posted March 14, 2020 For comparison a couple of similar sized early growth stage specimens of: Dactylioceras commune Kutygin, R.V., Knyazev, V.G. 2000 Ontogeny of the Ammonoid Genus Dactylioceras from Northeastern Russia. Paleontological Journal, 34(3):263-271 PDF LINK 4 Link to comment Share on other sites More sharing options...
gigantoraptor Posted March 15, 2020 Author Share Posted March 15, 2020 12 hours ago, piranha said: For comparison a couple of similar sized early growth stage specimens of: Dactylioceras commune Kutygin, R.V., Knyazev, V.G. 2000 Ontogeny of the Ammonoid Genus Dactylioceras from Northeastern Russia. Paleontological Journal, 34(3):263-271 PDF LINK Thank you for your answer. The right one is really similar to the fossil I have. Link to comment Share on other sites More sharing options...
Ludwigia Posted March 15, 2020 Share Posted March 15, 2020 I'd say that this is a small ammonite as well, probably either the very inner whorls or a "baby" Dacty, although Cleviceras is also possible. 3 Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
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