- Joined
- Feb 23, 2012
- Messages
- 7
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?
6mm rostrum apex
rostrum section showing septa
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?
6mm rostrum apex
rostrum section showing septa