It’s a wickle baby slipper lobster!
That color came from it being prepared on a slide so it could be examined under a microscope. The legs and antenna are all its own. Evibacus princeps also gets called a “shield fan lobster.”
You can find it (and a lot more) in the Smithsonian National Museum of Natural History collection, but I first noticed it in the Smithsonian Open Access collection of public domain imagery.