Solifugyd: a singular memory of family Sulfugidae, the 'camel spiders.' Best known for their terrifying shrieks and ability to jump 6 feet vertically, these lil' dudes ain't even spiders, but they are in class Chelicerata, subclass Arachnidaea.

The picture is a male Schistosoma blood fluke, though I like to think it looks like an ouroboros.