Conularia sp.?

[mbarco]

It's an Ordovician decalcified mould of a....? Scale bar 5mm.

One  person told me that it might be arthropodian (for example the backside of an unidentified librigena), but all the others don't have any idea about it.

I found on the "Treatise on invertebrate paleontology" (Part F - 1963) at p. F65 a resemblance with Conularia gracilis (first of all because it seems to lack transversal rows), also supported from a few very old pics from Google images. But I didn't find any modern confirmation of  the "Conularia gracilis" existence. 

It could be a Conulariid (only 1 has ever been found in this formation)?

Edited April 8, 2023 by mbarco

[rocket]

Hm, I do not think it is a Conularia, looks like a part of something bigger, bivalve?

 

[Rockwood]

I would expect more right angles in the geometry of a conularid. 

[mbarco]

1 hour ago, rocket said:

Hm, I do not think it is a Conularia, looks like a part of something bigger, bivalve?

 

Thanks for your answer, but which kind of bivalve?

[rocket]

1 hour ago, mbarco said:

Thanks for your answer, but which kind of bivalve?

do not know, only an idea

first impression was part of a pygidium of a trilobite, but I really do not have a 50%+ - idea...

where does it come from? Do you have locality and stratigraphic position? This might help 

thanks

Edited April 8, 2023 by rocket