Guess the fish!

[Bone guy]

So I was picking at the back of my new diplomystus and I found a partial skeleton! It's majorly cut-off, I know, and it's nothing special. I just figured you guys might have fun figuring out what it is!

[Tidgy's Dad]

It's amazing what one can find while fiddling. 

Is it from The Green River Formation and how long is the specimen? 

[Bone guy]

Yeah it's green river, length is about 1.5 inches.

[Tidgy's Dad]

There are very clever people who know their stuff on the forum but I'm not sure they could be certain from what is left of this. 

But I do know that the most common smaller fish found in the same beds as  Diplomystus is Knightia sp., I even used to have one, very common fish on the fossil market.

So that may be a likely candidate, though I am certainly not saying it is one and will probably be shot down in flames at any moment. 

But you did ask for guesses, so this is one. 

[Miocene_Mason]

It’s in too poor of a state for me to ascertain. Based on size, probably a knightia. Could be a Gosiutichthys as well.

[RJB]

Diplomystus.  Just a guess, but from the look at those bones on the bottom right hand side, the part that dips downward, tells me its a diplomystus.

 

RB

[Bone guy]

Cool! Yeah my guess was diplomystus. Still pretty cool though, gonna treasure these fish for a long time. 

[Rockwood]

Would there be a chance of exposing some fins on the ventral side ? Seems like I remember them as being diagnostic in some cases.

[Rockwood]

Found it. If you can find a complete enough anal fin that should differentiate Knightia from Diplo. at least.