''Haliclystus'' is a genus of

stalked jellyfish Stauromedusae are the stalked jellyfishes. They are the sole living members of the class Staurozoa and belong to the medusozoa subphylum of Cnidaria. They are unique among medusa jellyfish in that they do not have an alternation of polyp and med ...

that contains 11 species and one

nomen nudum In taxonomy, a ''nomen nudum'' ('naked name'; plural ''nomina nuda'') is a designation which looks exactly like a scientific name of an organism, and may have originally been intended to be one, but it has not been published with an adequate descr ...

(''

Haliclystus sanjuanensis ''Haliclystus sanjuanensis'' is a species of small (~4 cm) stalked jellyfish found in the Pacific Ocean along the west coast of North America. This species can be found in shallow waters at low tide on soft substrates such as seagrass (''Phy ...

''). It is the largest genus in the order Stauromedusae. Members of this genus are found in the Pacific, Atlantic, Indian, Arctic, and Southern oceans. Two members of this genus, ''

Haliclystus kerguelensis ''Haliclystus'' is a genus of stalked jellyfish that contains 11 species and one nomen nudum (''Haliclystus sanjuanensis''). It is the largest genus in the order Stauromedusae. Members of this genus are found in the Pacific, Atlantic, Indian, A ...

'' and ''

Haliclystus antarcticus ''Haliclystus'' is a genus of stalked jellyfish Stauromedusae are the stalked jellyfishes. They are the sole living members of the class Staurozoa and belong to the medusozoa subphylum of Cnidaria. They are unique among medusa jellyfish in th ...

'', are found in the Southern hemisphere only. The remaining 9 members are found in the Northern hemisphere only.http://www.mapress.com/zootaxa/2010/f/zt02518p059.pdf Species in this genus have four longitudinal planes of symmetry. They have eight arms which are tipped with clusters of secondary tentacles. The number of these secondary tentacles is reported to vary across the different species. Species in this genus also have eight large pads known as anchors located between the arms. These vary in size and shape and currently play in important role in differentiating one species from another. Some, but not all, species in this genus have prominent white

nematocyst A cnidocyte (also known as a cnidoblast or nematocyte) is an explosive cell containing one large secretory organelle called a cnidocyst (also known as a cnida () or nematocyst) that can deliver a sting to other organisms. The presence of this ce ...

clusters. The 'stalk' or peduncle in this genus is four chambered. At least one group of scientists have suggested that the taxonomy of this genus needs to be revised.Hirano YM (1997) A review of a supposedly circumboreal species of stauromedusa, ''Haliclystus auricula'' (Rathke, 1806). Proceedings of the 6th international conference on Coelenterate Biology, Leeuwenhorst, Nordwijkerhout, pp 247–252

References

External links

''Haliclystus'' entry on WoRMS
Haliclystidae Medusozoa genera {{Staurozoa-stub