Oedignathus inermis (species)

The genus "Oedignathus" has only one known species, and that is "Oedignathus inermis", more commonly known as the "granular claw crab". They are covered in tubercles and live in pairs (very romantic) under coralline algae.

They're found in relatively shallow waters in the Pacific, including the Pacific coasts of Canada. The above photo was taken by Neil McDaniel in Porlier Pass, British Columbia! So if you go diving in BC you might get to see one (or two).