Oxford Clay - Hybodont?

[Ossicle]

Oxford clay, Peterborough Member, Jurassic, Callovian, near Yaxley in Cambridgeshire.

 

I spent the morning getting muddy in wet clay, and found this. I think it might be part of a hybodont spine, or other ornate fish spine. I've collected a fragment of hybodont spine from this site before. The surface does seem to be enamel, and the shape is slightly curved.

 

Any assistance greatly appreciated.

[JamieLynn]

I would say Crab claw. I have found quite a few crab parts in Oxford Clay

Compare:

 

[Ossicle]

That's brilliant, thank you. I've wanted to find crustacean for ages! 

[Ossicle]

Thank you again for sending me on the right track. I found this on Callovian decapods, which has some really great labelled diagrams and images:

 

https://onlinelibrary.wiley.com/doi/full/10.1111/j.1475-4983.2009.00896.x

 

I'm also wondering about some pyratised remains I've been finding like this one, whether they might also be decapod? I think they're probably too small and squished to tell.

[JamieLynn]

ooohh....gonna check out that paper myself. Thanks! The second piece looks a bit like some of the Brittlestar legs I find in Cretaceous stuff here in Texas but I couldn't be sure, they are not quite well preserved enough to tell. I do know Brittlestars are found in the Jurassic Coast area, so that would be my guess. Compare:

[Ossicle]

Thank you. I have found a piece of brittle star before at this site, but I hadn't considered whether they might pyratise.

 

That's a beautiful piece, you can see the plates very clearly.