Periphyllidae

Periphyllidae is a family of jellyfish containing four genera and six species. The most well-known member of the family, Periphylla periphylla, is usually considered a deep-sea species, but it forms large blooms in surface waters of Norwegian fjords.

Genera

 * Nauphantopsis
 * Nauphantopsis diomedeae Fewkes, 1885
 * Pericolpa
 * Pericolpa campana (Haeckel, 1880)
 * Pericolpa quadrigata Haeckel, 1880
 * Periphylla
 * Periphylla periphylla (helmet jellyfish) (Péron & Lesueur, 1810)
 * Periphyllopsis
 * Periphyllopsis braueri Vanhöffen, 1902
 * Periphyllopsis galatheae Kramp, 1959