Black Stomatella?

[ESH]

This hitchhiker came in with a frag I just received. At first I thought it was a Black Sea slug, but upon closer inspection it appears to have a small shell on its back, making me believe it’s a black stomatella, which if I’m reading about correctly are good to add towards the clean up crew. Can anyone confirm this for me?

How I first saw it in the bag with the small chalice frag. A little bit larger then your standard hitchhiker.

 

[old salt reefer]

Yep that's what it is, cool in black.

 

[ESH]

Thanks! I was 99% sure it was, just wanted some conformation. Thanks again!