Periphyllidae is a
family
Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...
of
jellyfish
Jellyfish, also known as sea jellies or simply jellies, are the #Life cycle, medusa-phase of certain gelatinous members of the subphylum Medusozoa, which is a major part of the phylum Cnidaria. Jellyfish are mainly free-swimming marine animal ...
containing four genera and six species. The most well-known member of the family, ''Periphylla periphylla'', is usually considered a
deep-sea
The deep sea is broadly defined as the ocean depth where light begins to fade, at an approximate depth of or the point of transition from continental shelves to continental slopes. Conditions within the deep sea are a combination of low tempe ...
species, but it forms large blooms in surface waters of Norwegian
fjords
In physical geography, a fjord (also spelled fiord in New Zealand English; ) is a long, narrow sea inlet with steep sides or cliffs, created by a glacier. Fjords exist on the coasts of Antarctica, the Arctic, and surrounding landmasses of the no ...
.
[
]
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
''Periphyllopsis braueri'' is a red-colored jellyfish of the deep sea, belonging to the order Coronatae of the phylum Cnidaria. It is one of two species in the genus ''Periphyllopsis''. It has only been documented ~18 times because of the depth t ...
''
Vanhöffen, 1902
**''
Periphyllopsis galatheae''
Kramp, 1959
References
Taxa named by Ernst Haeckel
Cnidarian families
Coronatae
{{Scyphozoa-stub