What is "vampyrocrossota"

Vampyrocrossota is a genus of jellyfish of the family Rhopalonematidae.Thuesen, E.V. 1993. Vampyrocrossota childressi, a new genus and species of black medusa from the bathypelagic zone off California (Cnidaria: Trachymedusae: Rhopalonematidae). Proceedings of the Biological Society of Washington 106 (1): 190-194.

http://biostor.org/cache/pdf/a3/f3/cc/a3f3cc72a73958a5bc0da92920424458.pdf The genus only contains one species, Vampyrocrossota childressi. Unlike many hydromedusae, these jellyfish do not have a sessile stage. Rather, they spend their entire lives in the water column as plankton. The genus Vampyrocrossota is only known from the Pacific Ocean off California and Oregon.