Permian fossils

[ThePhysicist]

Hey y'all! Need help with some Permian material. 

 

1. Thought it was Xenacanth shark, but it looks odd to me (~ 3 mm):

 

 

2. Think it's a fish spine (~ 3 mm):

 

 

3. No idea; a tooth of some kind (~ 1 mm):

 

[ThePhysicist]

4. Pathological Labyrinthodont? I think it may have serrations on one carina... so then it wouldn't be. Don't think it's shark because of the way it sits in the bone. (~ 3 mm):

 

 

 

[ThePhysicist]

5. Sold as Dimetrodon sp., would like for someone to confirm or refute. A pretty rough one, I think I see maybe 3 serrations. Virtually no enamel left (~ 8 mm).

 

 

 

All of these from Waurika, OK.

[JohnJ]

@dinodigger Chris could shed some light here.  

[JohnJ]

On 1/2/2021 at 10:26 PM, JohnJ said:

@dinodigger Chris could shed some light here.  

 

You could try sending @dinodigger a PM.

 

Not sure if @jdp can assist....

 

 

[dinodigger]

Number 5 does have the offset pointed oval cross section with distinct keels, I think it is most likely Ddon, lower anterior post canine. Number 1 is indeed a Xenacanthid tooth tip. Number 3 has a slight chance at being a Diadectid tooth, mebbe incisor. 

[JohnJ]

Thanks, Chris.    

@dinodigger

[dinodigger]

On 1/10/2021 at 9:37 PM, JohnJ said:

Thanks, Chris.    

@dinodigger

You bet!

[jdp]

I think all the serrated tooth frags are Orthacanthus but 5 could plausibly be Dimetrodon. 2 is a midline scale from a ray-finned fish. 3 is a weird one; my first thought was diadectid but it's really too small for that; it could belong to a platysomid or cheirolepid fish, perhaps.

[ThePhysicist]

@dinodigger@jdp, thank you both! I had originally thought 3 could be a posterior Captorhinid, but didn't see any striations...

 

[jdp]

I don't think it's captorhinid. I also don't think it's microsaur. I do think it's fish but, again, couldn't really pin it down on a genus and species for you.

[jdp]

By the way, I realize I combined "Mesolepidae" and "Cheirodus" into "Cheirolepidae" which is a totally different group. I did mean Mesolepidae/Amphicentridae, the group of deep-bodied Carboniferous-Permian fishes.