However you look at it, Opabinia was a remarkably odd-looking creature – so it’s a natural choice for a big cuddly plush toy, right?
I’m guessing most people wouldn’t look at a five-eyed worm with a snaggle-toothed trunk and react with, “Aw, how cute!” Granted, most people aren’t paleontology nerds, either, so your mileage may vary in perspective.