It looks utterly nuts! Or maybe broccoli. It appears to have big chunks of broccoli sticking out of every corner of its body.
And then there's that stalk of Brussels sprouts sticking out of its back. One specimen was measured at 10 cm (4 in) in length and had a tower of protuberances that was 6 cm (2 in) tall! Slugs aren't built for speed at the best of times but this one is so awkward it's a wonder she can keep upright.
And that seems to be the point. While there's very little known about Miamira alleni, its extraordinary appearance seems to serve as camouflage among certain soft corals in its habitat. It wouldn't be surprising if it fed on those self same corals, too.
There's no broccoli or Brussels sprouts in the sea.