The Cyaneidae are a family of true jellyfish. About 20 species are in this family, including the well-known lion's-mane jellyfish. Species The following species are recognized within the family Cyaneidae. Formerly, this family also included the genus Drymonema. The Cyaneidae species do not possess any internal organs, ganglia, or any other nerve cells. They do, however, possess gap junctions between neurons which allow for complex reactive behavior and swimming actions. Genus Cyanea Péron & Lesueur, 1810 Cyanea annaskala von Lendenfeld, 1884 Cyanea buitendijki Stiasny, 1919 Cyanea capillata (Linnaeus, 1758) Cyanea citrae (Kishinouye, 1910) Cyanea ferruginea Eschscholtz, 1929 Cyanea lamarckii Péron & Lesueur, 1809 Cyanea nozakii Kishinouye, 1891 Cyanea postelsi Brandt, 1838 Cyanea purpurea Kishinouye, 1910 Cyanea rosea Quoy & Gaimard 1824 Genus Desmonema L. Agassiz, 1862 Desmonema chierchianum Vanhöffen 1888 Desmonema comatum Larson 1986 Desmonema gaudichaudi (Lesson 1832) Desmonema glaciale Larson 1986 Desmonema scoresbyanna Gershwin & Zeidler 2008 References Semaeostomeae Cnidarian families