Most hydromedusae have shorter lifespans than the larger scyphozoan jellyfish. Their exact position as a family or suborder of extinct scyphozoan cnidarians is highly speculative. Aurelia is a genus of scyphozoan jellyfish, commonly called moon jellies. "Cyanea annaskala" is in the scyphozoan class of the phylum Cnidaria. Scyphozoan polyps can both bud and split down the middle. Similar cases include hydrozoan "Laodicea undulata" and scyphozoan "Aurelia" sp.1. "Albumares" was originally described by Mikhail Fedonkin as a free-swimming scyphozoan jellyfish. Just like "Ediacaria" (see also below), "Aspidella" has initially been considered a scyphozoan jellyfish. Young sharks also consume scyphozoan jellyfish and crustaceans, including mud shrimps ("Callianassa") and penaeid prawns.