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Doug Von Gausig

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I run across these guys frequently in the Mississippian Redwall Limestones around Arizona's Verde Valley. They are generally accompanied by lots of Crinoids and solitary Rugose Corals. They're always this oval shape with segmented structure. They look like an isopod, to me, but could be some other crustacean. 

 

Any help out there for the identification of these "bugs?"Isopod-20210208_163236-1s.thumb.jpg.a08cd0418699214c7ebd5b07ecda036a.jpgIsopod-20210208_163142-1s.thumb.jpg.00d8351e54c2fca7ca270d05df70352c.jpg

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I'm personally not seeing anything organic. Is it crystalline? Also, if you could, attach some pictures of the other ones you've found, it could really help! Edit: I'm not very knowledgeable with isopods, so, by all means, veto this comment!:headscratch:

~ Isaac; www.isaactfm.com 

 

"Don't move! He can't see us if we don't move!" - Alan Grant

 

Come to the spring that is The Fossil Forum, where the stream of warmth and knowledge never runs dry.

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I would also lean towards isopod. You might ask George D.F Wilson. He will know.

Thomas

Be not ashamed of mistakes and thus make them crimes (Confucius, 551 BC - 479 BC).

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Not enough visible to be truly diagnostic, but an isopod may be likely, though the conspecifics described may indicate juvenile trilobites, or even more likely something akin to modern Chitons.

 

however, the slight serrations visible in some views indicate crinoid columnals fractured as an angular cross section to me.

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17 minutes ago, LabRatKing said:

 

....however, the slight serrations visible in some views indicate crinoid columnals fractured as an angular cross section to me.

Could also be.

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Be not ashamed of mistakes and thus make them crimes (Confucius, 551 BC - 479 BC).

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On 9.2.2021 at 3:09 PM, Doug Von Gausig said:

I run across these guys frequently in the Mississippian Redwall Limestones around Arizona's Verde Valley. They are generally accompanied by lots of Crinoids and solitary Rugose Corals. They're always this oval shape with segmented structure. They look like an isopod, to me, but could be some other crustacean. 

 

Any help out there for the identification of these "bugs?"

 

Usually you can see the "crabby" texture if it is an isopod, hope the picture inserted is good enough to give an idea, this is Palaega Danica from northern Jutland in Denmark

 

DSC_0877 (3) Palaega danica.JPG

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I can see the pores in the photo you posted, but my critter is not in as good a state of preservation to show these. I am leaning more and more toward crinoid stem seen obliquely.

 

Thanks!

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On 2/9/2021 at 2:30 PM, LabRatKing said:

Not enough visible to be truly diagnostic, but an isopod may be likely, though the conspecifics described may indicate juvenile trilobites, or even more likely something akin to modern Chitons.

 

however, the slight serrations visible in some views indicate crinoid columnals fractured as an angular cross section to me.

I'm leaning more in that direction, and thanks!

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3 hours ago, Packy said:

It looks like there are irregular lines between each section, it coild be a crinoid stem section broken on a angle.   Packy

Yeah, I'm thinking you're right, Packy.

 

Thanks!

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When I saw the first picture, my initial reaction was: it’s a polyplacophoran (chiton)!  Which would be really cool as they are relatively rare, especially as articulated fossils. It had a nice rounded head valve, the correct number of intermediate valves, very neat. And then I looked at the second picture and closer at both of then and sadly (for me) I have to agree with the others, they look like fractured crinoid cross sections.  Interesting none the less. 

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Upon further inspection, yes, I was wrong with the "inorganic" comment. Crinoid columnal, agreed.

~ Isaac; www.isaactfm.com 

 

"Don't move! He can't see us if we don't move!" - Alan Grant

 

Come to the spring that is The Fossil Forum, where the stream of warmth and knowledge never runs dry.

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  • 11 months later...

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