Lucernaria janetae is an exceptionally large stalked jellyfish discovered on deep-sea hydrothermal vents on the East Pacific Rise in 2003 and described in 2005.

[1] This species was named after Dr Janet Voight of the Field Museum of Natural History in Chicago "in recognition of her commitment to discovering and describing deep-sea invertebrates".

Unlike most Stauromedusae, which are solitary organisms, L. janetae forms large populations and, where it occurs, is the dominant macrofauna.

[2] L. janetae has 8 gonads which are shaped like lances and arranged in pairs extending from the centre of the calyx to the base of the arms.

The scientists who originally identified L. janetae have speculated that this species may also be capable of asexual reproduction.