Need help with identifying fossil

[Kaylak]

Found fossil in stream in Eureka, Missouri, USA. Does anyone know what the fossil may be? It is about 1/2 inch.

[Tidgy's Dad]

That's a really nice trilobite pygidium. 

And a few crinoid stem columnals in the rock too. 

Very nice find. 

[Kaylak]

First trilobite! Very exciting. Thank you for your help.

[piranha]

The pygidium matches with the arrangement of tubercles found on numerous species of: Piltonia sp.

 

image from: crinus.info

[Kaylak]

Nice; exciting find for me. I appreciate you taking the time to help me out!

[Peat Burns]

Nice find!

[Tidgy's Dad]

11 hours ago, Kaylak said:

First trilobite! Very exciting. Thank you for your help.

I can't quite make it out, but are you holding a tortoise in your profile photo?

I love tortoises. 

[Kaylak]

13 hours ago, Tidgy's Dad said:

I can't quite make it out, but are you holding a tortoise in your profile photo?

I love tortoises. 

Haha it's a little box turtle. Had to save him on the road. 

[Tidgy's Dad]

1 hour ago, Kaylak said:

Haha it's a little box turtle. Had to save him on the road. 

Yes, an nice big boxie, Terrepene ornata ornata, I expect. 

Thanks for helping. Too many get squashed on the roads, sadly. 

[Rockwood]

2 hours ago, Kaylak said:

Haha it's a little box turtle. Had to save him on the road.