I would like some help identifying these various marine fossils from Calvert Cliffs, MD. Thanks!

[Ordivician19]

A couple of weeks ago, I went to Calvert Cliffs, MD to comb the beach for shark teeth, and came across these:

 

 

A lot of them are missing their tops, which may make ID more difficult. Also, I’m not sure if 7 is even a tooth or just conveniently shaped. I’m fairly confident that 9 is a thresher shark, and think that 1-3 are maybe lemon sharks, but otherwise I’m lost. I’m particularly interested in (what I believe is) the vertebra and the sting ray mouth plate (13 and 14, respectively). I tried to get better supplemental photos, though fossil size and camera quality were a limiting factor:

 

I look forward to learning about these. Thank you!

Edited April 28, 2022 by Ordivician19
Added another image

[hemipristis]

1,2,3, 6            small Carcharhinus sp. shark teeth

4,5,8,10.12.  crab claws

9                       tiger shark tooth Galeocerdo aduncus

11                     snaggletooth shark tooth Hemipristis serra

13                    shark vertebra

14                    ray "plate"; the jaws of many rays consist of rows of parallel "plates". this is one of them. Some mat be able to ID this one to genus, but I cannot

[Ordivician19]

Aha, I didn’t realize crab claws were able to become fossilized. I suppose it makes sense now that I think about haha. Thank you for your help!

[Fin Lover]

I thought maybe this would be a good test for me (beginner), but I never would have gotten the snaggletooth. Hemipristis, is it a lower tooth?  Upper teeth all have the serrations, correct?