Unknown belemnitid/belemnotheutid, Upper Lias, Yorkshire

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I've just collected this large phragmocone with tiny rostrum from the Falciferum Subzone ("Bituminous Shales") near Whitby. I've been collecting and studying belemnites and other coleoids for decades but haven't seen another like this from the Yorkshire Lias (or anywhere else, really) before.

It's belemnotheutid like in that it has a small rostral apex, the rest of the rostrum apparently being a thin layer over the end of the phragmocone. Chondroteuthis wunnenbergi from the Alderton Fish Bed is the nearest I can find in the literature. The apical angle of this one is much larger though, about 45 degrees in the crushed state so roughly 30 degrees uncrushed.

The wide phragmocone resembles Phragmoteuthis and Clarkeiteuthis but they don't have a rostrum.
It is also reminiscent of the belemnite Coeloteuthis.

Length: 12.5cm
Max. width: 7cm
Rostral apex, photographed separately befor regluing: 6mm long.

Any suggestions gratefully received! - anything like it from the Posidonienschiefer perhaps?

IMG_1278.jpg

IMG_1279.jpg

6mm rostrum apex
IMG_1273.jpg

rostrum section showing septa
IMG_1272.jpg
 
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It's a wonderful find!

I forwarded the post to Dirk Fuchs, expert on fossil coleoids, and I'm sure he will be able to help (as for me, after a day off, it's back to the airport. I'll browse the literature next weekend - the last paper I remember reading on Yorkshire coleoids was Doyle 1990, quite a long while back).
 
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Thanks very much, Hajar, that's brilliant. I've read several of Fuchs' papers and he's certainly an ideal person to look at this, hope he's interested.
I should perhaps ask Peter Doyle too - as well as his 1990 teuthid paper, there's Doyle & Shakides, 2004, on Belemnotheutina, which has some possibly related material.
 
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Many thanks, Hajar, and to Dirk and Robert, that's very helpful.

So probably a coeloteuthine belemnite, although I think something belemnotheutid like is still a possibility.

The rostral preservation in the broken section doesn't show radiating belemnite-type crystal structure and may be aragonitic - it looks similar to belemnite epirostrum sections from the same beds.

With the specimen in hand, it seems there is a large, thin rostral sheath anterior to the apical bit - of course, ordinary belemnites show that as well when they're complete enough.

More material would be nice - I can't believe these haven't turned up before.

(I'm TqB, Tarquin, from other forums by the way - we've exchanged comments before, your coleoid collection is very fine!)
 

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