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Penn Dixie E. rana injury?


Greg.Wood

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Not exactly an ID but I can't think of a better place to post this.

 

Here is an E. rana I found this week at Penn Dixie. Prep started on the right lobe which was exposed on the side of a block (fourth pleura is damaged due to being exposed). It was looking like a near perfect bug, nicely inflated and complete aside from the small chip. When I made my way around to the other side I found more damaged pleura. This was a surprise as the entire middle and left lobes were buried under significant matrix.

 

Could this be an injury that killed/happened during the trilobite's lifetime?

 

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Regardless of the injury/damage, that looks like a nice specimen to me. Very nice prep work as well, IMN(Newbie)O.  I hope you get good news on the injury being a bona-fide injury during its lifetime. Good luck.

 

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Magnificent specimen :envy: Doesn't look like a fatal injury however, the curved/rounded ends of pleura suggest pathological or recovery from early damage perhaps. 

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Very nice!  :wub:

'Those who cannot remember the past are condemned to repeat it.'

George Santayana

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I think the slight separation of the cephalon and pygidium point to this being a molt.

Much more fragile than complete, unmolted specimens. :unsure: 

 

It could be an injury pre-molt, but I have doubts. 

 

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I also have some doubts about life-sustained damage given that some of these pleural tips have sharper, more defined shell breakage. If it is injury, it might have been at an earlier stage of healing as it would take successive moults to repair this kind of significant shell damage.

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2 hours ago, Kane said:

some of these pleural tips have sharper, more defined shell breakage

Agreed, the first and ninth definitely have a sharp broken edge. The ones that appear rounded may have the edge hidden so I’ll have to remove some more matrix to see the entire tip.

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5 hours ago, Greg.Wood said:

Agreed, the first and ninth definitely have a sharp broken edge. The ones that appear rounded may have the edge hidden so I’ll have to remove some more matrix to see the entire tip.

And if you uncover a few tiny crutches you'll know for sure! :heartylaugh:

 

 

Mark.

 

Fossil hunting is easy -- they don't run away when you shoot at them!

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