lobster? or crab?

"I should been a pair of ragged claws / Scuttling across the floors of silent seas." -- T.S. Eliot in "The Love Song of J. Alfred Prufrock"

And would such scuttling claws pinch their pincers to pick up any scurrying underwater ants?

(Just aiming for the high-brow, even if it's a stretch scientifically.)