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Very small ammonite


gigantoraptor

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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?

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image.png.eb1cd55ac8bc797bc47cc0465336e5ef.png

image.png.53522e01df63c42fef1bdf561ebe39eb.png

 

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Probably a microchonchid, rather than an ammonite. 

 

image.png.ebfc2895bb4238fdf7305a3c9fdb93c8.png

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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.  

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For comparison a couple of similar sized early growth stage specimens of: Dactylioceras commune

 

image.png.2c0f76ed76eae2559b8281772abbe859.png

 

Kutygin, R.V., Knyazev, V.G. 2000

Ontogeny of the Ammonoid Genus Dactylioceras from Northeastern Russia.
Paleontological Journal, 34(3):263-271  PDF LINK

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image.png.a84de26dad44fb03836a743755df237c.png

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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. 

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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.

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