Rhopalonematidae
| Rhopalonematidae | ||||||||||
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Crossota sp. |
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| Systematics | ||||||||||
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| Scientific name | ||||||||||
| Rhopalonematidae | ||||||||||
| Russell , 1953 |
The Rhopalonematidae are cnidarians from the class of the hydrozoans . They are the most species-rich family from the subordination of the Trachymedusae .
features
The manubrium of the Rhopalonematidae is narrow and can be stalked or sessile, the mouth has distinct lips. Usually they have eight, but rarely more, of the narrow radial canals , centripetal canals are absent. The gonads either rest against these and are then spherical or linear or hang down in pockets in the cavity below the screen. The numerous edge tentacles are evenly distributed around the edge of the screen or arranged in groups. The mostly club-shaped sensory organs ( statocysts ) are at the edge and are free.
Geographical occurrence and way of life
The representatives of the family are spread around the world.
Systematics
The family was set up in 1953 by Frederick Stratten Russell , the type genus is Rhopalonema Gegenbaur, 1854. The systematics given here follows the information from the World Hydrozoa Database . The family contains 16 genera and 34 to 36 species, making it the most extensive family in the order of the Trachymedusae .
- Aglaura Péron & Lesueur, 1810
- Amphogona Browne, 1904
- Arctapodema Dall, 1907
- Benthocodon Larson & Harbison, 1990
- Colobonema Vanhoeffen, 1902
- Crossota Vanhoeffen, 1902
- Pantachogon Maas, 1893
- Persa McCrady, 1859 (invalid, preoccupied by Persa Bechstein, 1805 and Persa Adams, 1855)
- Ransonia Kramp, 1947
- Rhopalonema Gegenbaur, 1854
- Sminthea Gegenbaur, 1857
- Stauraglaura Haeckel, 1879
- Tetrorchis Bigelow, 1909
- Vampyrocrossota Thuesen, 1993
- Voragonema Naumov, 1971
proof
- Jean Bouillon, Cinzia Gravili, Francesc Pagès, Josep-Maria Gili and Fernando Boero: An introduction to Hydrozoa. Mémoires du Muséum national d'Histoire naturelle, 194: 1–591, Publications Scientifiques du Muséum, Paris 2006 ISBN 978-2-85653-580-6
- Marymegan Daly, Mercer R. Brugler, Paulyn Cartwright, Allen G. Collin, Michael N. Dawson, Daphne G. Fautin, Scott C. France, Catherine S. McFadden, Dennis M. Opresko, Estefania Rodriguez, Sandra L. Romano & Joel L. Stake: The phylum Cnidaria: A review of phylogenetic patterns and diversity 300 years after Linnaeus. Zootaxa, 1668: 127-182, Wellington 2007 ISSN 1175-5326 Abstract - PDF
- Paul Lassenius Kramp: Synopsis of the Medusae of the World. Journal of the Marine Biological Association of the United Kingdom, 40: 1-469, Plymouth 1961 PDF Online (p. 243)
