Black slug? Or X-files alien creature?

[ClownWrangler]

The stuff nightmares are made of. It's about the size of a nickel and it moves like a slug. I thought it was a spot of tar until it was in a different spot the next day. It has two antenna as well. What is it?

 

[xxkenny90xx]

 

[DinoMagnet]

Not 100% sure but a quick google search gave “elephant slug” black and two antennas hope this helps.

 

[king aiptasia]

couple of limpets are jet black as well

 

[duberii]

I agree that it's probably a elephant slug- I think their genus is scutus. Just another algae grazer

 

[Tamberav]

The stuff nightmares are made of. It's about the size of a nickel and it moves like a slug. I thought it was a spot of tar until it was in a different spot the next day. It has two antenna as well. What is it?

It is a black limpet or maybe elephant slug? I have an orange one but I had a black one years ago. I would love to have a black one again too!

my orange guy

 

[Cnidoblast]

I have a distant memory regarding these - if I recall they are a harmless snail