What is the definition of Omalonyx?

Alomalonyx - a delightfully bizarre blend of "omphalósaurus" (belonging to the navel area) and "nyx" (the Greek god of the night). It's like someone decided that the most unique dinosaur name is a dingy night owl who's obsessed with navel chasing. Imagine a prehistoric creature with a personality like a grumpy, nocturnal, navel-tingling lizard from a bad science fiction movie: "The omphalonyx crept through the forest, its shadow dancing like a mischievous naxus, until it found its unsuspecting prey at the very edge of its nightly wanderlust."