It's no contest. The sea pig has everything a mere cat lacks: it's cute and adorable, it's pink, and it's got tentacles. Once you've gone holothurian, you'll never go…uh, I'm sure the local poet will be along to provide a catchy rhyme.
(Also on FtB)
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Cats are so undignified, yowling and screeching and spraying urine all over the place.
Sheril over at The Intersection seems to be confused about what the coolest invertebrate is. She goes so far as to call out PZ about his hyper-infatuation with Cephalopods.