Dendrocystites and...? Ordovician Echinoderm?

[Mahnmut]

Hello dear fellow forum members,

I just acquired this nice specimen of a carpoid, sold as Dendrocystites barrandei from the Czech republic which I have no reason to doubt.

My first carpoid, yay! Fascinating group.

I wonder about the starfish-like impression to the right of the carpoid though, is that an early "classic" echinoderm?

Best regards,

J

Edited June 24, 2022 by Mahnmut
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[Mahnmut]

Ok,

now I have it in hand. My photo is not much different from the sellers', but I tried to get more contrast with low lighting.

Sorry for the lack of scale, the star is about 1cm across.

The formation is interesting enough for me to try and find out what it is I got there. Maybe just another perspective on Dendrocystites?

https://en.wikipedia.org/wiki/Letná_Formation#Fossil_content

 

Who can tell me what that bycatch is?

[Mahnmut]

Ok,

same location (same seller, could have thought to look there earlier).

I think I have got a Protaster accompanying my Dendrocystites.

I like that.

Best Regards,

J

[Mahnmut]

Hi,

just learned that Dendrocystites is a Cystoid, not a Carpoid. Well, fair enough.