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Peat Burns

Conispiral gastropod Silica Shale (UPDATE)

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Peat Burns

UPDATE:  This could be Murchisonia sp. which has been recorded from the underlying Dundee Limestone and deposited in the Ohio State University Museum of Biological Diversity.

 

Hello,

 

I found a rare conispiral gastropod steinkern in the middle Devonian (Givetian) Silica Shale of Paulding, Ohio, last week.  It's the first strongly conispiral gastropod I've ever found in the Middle Devonian (let-alone the Silica Shale).  I looked through the FUMMP online database as well as the "Strata and Megafossils of the Middle Devonian Silica Formation" published by FUMMP and couldn't find any taxa that looked like this.  It has the general shape of Paleozygopleura known from the Hamilton Group of New York.  Is anyone aware of a snail with this general morphology that has been reported from the Silica Shale? 

 

Scale in mm.

 

20180423_000411.thumb.jpg.1fb9dd85abc76ce9f8d1c1cc110d96ce.jpg

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doushantuo

Not even remotely an id<but : a palaeozygopleurid?

edit: thus proving that I am a bad reader.:D

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Peat Burns
58 minutes ago, doushantuo said:

Not even remotely an id<but : a palaeozygopleurid?

Thanks doushantuo, it sure has that general morphology as indicated in my initial post, but I just can't find any records from the Silica Shale.  The older records only list 4 species of gastropods:

 

Platyceras dumosum rarispina

Platyceras bucculentum

Platyceras carinatum 

Platystoma lineata

 

(Btw, I think the genus name on some Platyceras has since been changed)

 

A couple of tiny, less strongly conical taxa are included in the aforementioned book, but are not good matches. 

 

Maybe it's a new member of the Silica Shale fauna... (probably not, but it would be neat to be able to add one).

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doushantuo

I think Bowsher did something with Platyceratids,taxonomically and ecologically speaking

FYI(below,less than 2,5 Mb)

Patterns_of_convergence_in_general_shell.pdf

:D

euh: reworked Morania/Medfrazyga?*

*yes,"straws","clutching"

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Peat Burns
18 minutes ago, doushantuo said:

I think Bowsher did something with Platyceratids,taxonomically and ecologically speaking

FYI(below,less than 2,5 Mb)

Patterns_of_convergence_in_general_shell.pdf

Thank you. I think the Platyceras dumosum rarispina or Platyceras rarispina is now genus Spinyplatyceras.  The rest, I think, are still Platyceras .

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doushantuo

At the risk of offending you:

bullgeosci841_1125.pdf

UNDOUBTEDLY already in numerous libraries on this forum,coz CBG is free access

sha5wyykmicroraptuydge64sllifeernakristlanthc.jpg

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Peat Burns
5 minutes ago, doushantuo said:

At the risk of offending you:

bullgeosci841_1125.pdf

Not at all (why would I be offended?).  Love the pics of the protoconchs.

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doushantuo

Because  i thought you would already be familiar with it:D

 

sha5wyykmicroraptuydge64sllifeernakristlanthc.jpg

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Peat Burns
4 minutes ago, doushantuo said:

Because  i thought you would already be familiar with it:D

 

Ah okay. Well now I take that as a compliment :).  I wish I had time to keep up with the Palaeozoic invertebrate zoology literature.  It's hard enough to keep up with the literature in my own specialty!

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doushantuo

yeah,know what you mean.

 

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Peat Burns

UPDATE:  This could be Murchisonia sp. which has been recorded from the underlying Dundee Limestone and deposited in the Ohio State University Museum of Biological Diversity.

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Tidgy's Dad

Nice find. 

Most unusual. :)

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