black stomatella? nudi?

[FOXYB]

just when my daylights went out i notice something i haven't seen before out grazing the rocks. it looks just like a stomatella but is completely black with tiny white speckles.
too small to take a pic of

any guesses?

 

[Doherty]

I have a few black stomatellas running around in my tank as well.

 

[FOXYB]

looks like this but has a small shell that is all black