Light production is vital for "Lampyris noctiluca". DNA sequence comparisons suggest that the closest relative of the genus "Noctiluca" is "Spatulodinium". Dinoflagellates have a haplontic life cycle, with the possible exception of "Noctiluca" and its relatives. Additionally, swarms of "Pelagia noctiluca" have been recorded wiping out entire fish farms. Initially, the medusa of "P. noctiluca" only has a bell diameter of about . In the 2005 there was an influx of jellyfish, mostly Pelagia noctiluca. Some, like the European glow-worm beetle, "Lampyris noctiluca", have no mouth. Due to flooding in 2011, Gippsland Lakes experienced blooms of bioluminescent Noctiluca scintillans. The family contains the widely distributed species "Noctiluca scintillans". "Lampyris noctiluca" presents a conspicuous sexual dimorphism. Other names attached to the night flight of Herodias included "Minerva" and "Noctiluca". "P. noctiluca" has eight marginal tentacles alternating with eight marginal sense organs. It is currently considered as monotypic with one species, "Pelagia noctiluca" . Each "P. noctiluca" medusa has eight long tentacles that emerge from the umbrella margin. In addition "P. noctiluca" also lacks a gaseous exchange, excretory and circulatory system.