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Listracanthus denticle?, then another or different altogether?


Bonehunter

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Bonehunter

Hi all!

      Well, now I am into splitting shale finding conodonts and will post my best ones soon, but I've come across several of these which are comparable to images in the forum and on references to Listracanthus denticles?. It was found in Pennsylvanian Stark shale member in Kansas City two days ago. Is that a fair i.d.? They're are all very similar, but I've found this as well- a "carbonized" film with a structure that doesn't have straight lines, but somewhat veinated? Very difficult to get pics of that so provided several in different light. The first is 27mm long and the black piece is only about 2-3mm at most. Am I on the right track on the first, and any ideas on the second? same, fish fin, plant impression/other? thanks!

Bone

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Then here's the other one- found in a different slab of shale but same level- the bottom "ridge" appears to diverge in the first couple pictures, then there appears to be divergence in the middle in the darker pics. Any thoughts welcomed!  Bone

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The first object (the longer pyritized fossil) is definitely Listracanthus. Nice find! The second item does not look like Listracanthus. I would guess it is a paleoniscoid scale, due to its approximate rhomboidal shape.

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Bonehunter

WOW!!! Thanks!!!......it fuels my childhood fascination with prehistoric/dinosaur "hunting" that's cool- I found a proposed image of one-(photo credit to Christian Darkin) so cool!!!!!! Thanks again!

Bone

listracanthus-shark-christian-darkin.jpg.087cfe546bd53bda577e99e484d1c65d.jpg

 

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  • 2 weeks later...
On 5/8/2020 at 12:23 PM, connorp said:

The first object (the longer pyritized fossil) is definitely Listracanthus. Nice find! The second item does not look like Listracanthus. I would guess it is a paleoniscoid scale, due to its approximate rhomboidal shape.

Thanks for this. I think you may have just solved a mystery in my Permian poop. Did these critters swim in freshwater?

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1 hour ago, GeschWhat said:

Thanks for this. I think you may have just solved a mystery in my Permian poop. Did these critters swim in freshwater?

If you’re referring to paleoniscoids then yes I believe so.

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