Gigarhytus

Gigarhytus (from Latin giga "huge" and Ancient Greek ῥύτις rhytis "wrinkle") is an extinct genus of animal belonging to the superphylum Deuterostomia containing a single species, Gigarhytus pulsatarius (from Latin attributive pulsatariuss "[of a] pulse"). Having lived approximately 535 million years ago in the Fortunian stage of the Cambrian Period, it is one of the oldest known confirmed species of this superphylum.