Rhizostomae
Lung jellyfish ( Rizosthoma pulmo )
The Rhizostomae ( Rhizostomeae ) are an order of screen Jellyfish ( Scyphozoa ). About 80 species are known, inter alia, living on Europe's coasts lung jellyfish ( Rizosthoma pulmo ), which reaches a screen diameter of 60 to 80 centimeters, the punctata occurring in the North Sea ( Rhizostoma octopus ) and fried egg jellyfish ( Cotylorhiza tuberculata ) from the Mediterranean. Nemopilema nomurai is the largest punctata. It reaches a diameter of up to two feet and a weight of up to 200 kilograms. Their tentacles are up to 5 meters long.
Features
Rhizostomae have a cup-shaped or high-arched screen which is tentakellos. Instead, the leadpipe is highly developed, the mouth tube edges are stalk -like and extended verfalteten to one another, grown rootstock like structures. So are typically eight arms emerged with numerous curly branches. A central mouth opening is missing. It is replaced by numerous small pores in the mouth arms. Nevertheless Rhizostomae can also eat larger prey. You will be stunned by the numerous stinging cells at the mouth arms, surrounded by it, and then, as far as dissolved by digestive juices which are secreted by the pores, they can be recorded.
When strobilation usually only one medusa is formed.
System
- Order Rhizostomae ( Rhizostomeae )
- ( Subordination Kolpophorae Kramp, 1961) Family Cassiopeidae Agassiz, 1862 Genus Cassiopea Péron & Lesueur, 1810 Cassiopea andromeda Forskål, 1775
- Genus Cephea Péron & Leseur, 1803
- Genus Cotylorhiza Agassiz, 1862 Fried egg jellyfish ( Cotylorhiza tuberculata )
- Genus Mastigias Agassiz, 1862 Mastigias papua ( Lesson, 1830)
- Crown jellyfish ( Periphylla periphylla ( Péron & Leseur, 1809) )
- Phyllorhiza punctata ( Phyllorhiza punctata of Lendenfeld, 1884)
- Genus Thysanostoma Agassiz, 1862
- Genus † Prothysanostoma Ossian, 1973 ( Pennsylvanian )
- Genus Versuriga Kramp, 1961 Versuriga anadyomene (Maas, 1903)
- Family Lychnorhizidae Haeckel, 1880 Genus Lychnorhiza Haeckel, 1880 ( syn. Cramborhiza Haeckel, 1880)
- Genus Anomalorhiza Light, 1921
- Genus Pseudorhiza of Lendenfeld, 1882
- Genus Acromitoides Stiasny, 1921
- Genus Acromitus Light, 1914
- Genus Catostylus Agassiz, 1862
- Genus Crambione Maas, 1903
- Genus Crambionella Stiasny, 1921
- Genus Leptobrachia Brandt, 1838
- Genus Lobonema Mayer, 1910
- Genus Lobonematoides Light, 1914
- Genus Eupilema Haeckel, 1880
- Genus Rhizostoma Cuvier, 1800 Punctata ( Rhizostoma octopus ( Mayer, 1910) )
- Rhopilema esculentum Kishinouye, 1891
- Rhopilema Verrilli ( Fewkes, 1887)
- Genus Nemopilema Kishinouye, 1922 Nemopilema nomurai Kishinouye, 1922
- Stomolophus meleagris Agassiz, 1862
Use
In Japan and Southeast Asia Rhizostomae, especially the kind Rhopilema esculenta are eaten. Many thousand tons are caught annually, and sold dried or salted.