Tarphycerids

Hajar

Haliphron Atlanticus
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#1
Here's a pretty 9 cm Lituites from the Ordovician of Sweden. I've just been reading here that this was one of the first fossil cephalopods to be recognised.

There's a tarphycerid from the Ordovician of the Welsh Borderland here.
 

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Hajar

Haliphron Atlanticus
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#3
Just found a brand new publication by Turek & Manda discussing colour patterns in the tarphycerid Peismoceras. It can be downloaded from here (Turek & Manda 2010).

They write "A marked asymmetry of colour pattern on lateral sides has been observed in several cases, but with no proven relationship to the slight dextral coiling of the shell."
 

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Hajar

Haliphron Atlanticus
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#6
Yes, in this case each of those red bands occurs at the edge of a septum. I don't think the red bands are actually at the surface of the shell (with its fine growth lines), but are visible through the calcite. Have you ever come across something like this?
 

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