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Petasidae
Petasidae is a family of cnidarians belonging to the order Trachymedusae Trachymedusae belong to the phylum Cnidaria and the class Hydrozoa, among the 30 genera are 5 families containing around 50 species in all, the family Rhopalonematidae has the greatest diversity. Description Trachymedusae are identifiable by the .... Genera: * '' Petasiella'' Uchida, 1947 * '' Petasus'' Haeckel, 1879 References Trachymedusae Cnidarian families {{hydrozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Petasidae
Petasidae is a family of cnidarians belonging to the order Trachymedusae Trachymedusae belong to the phylum Cnidaria and the class Hydrozoa, among the 30 genera are 5 families containing around 50 species in all, the family Rhopalonematidae has the greatest diversity. Description Trachymedusae are identifiable by the .... Genera: * '' Petasiella'' Uchida, 1947 * '' Petasus'' Haeckel, 1879 References Trachymedusae Cnidarian families {{hydrozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Petasiella
''Petasiella'' is a monotypic genus of hydrozoans belonging to the family Petasidae. The only species is ''Petasiella asymmetrica''. The species is found in Malesia Malesia is a biogeographical region straddling the Equator and the boundaries of the Indomalayan and Australasian realms, and also a phytogeographical floristic region in the Paleotropical Kingdom. It has been given different definitions. The .... References Petasidae Hydrozoan genera Monotypic cnidarian genera {{hydrozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trachymedusae
Trachymedusae belong to the phylum Cnidaria and the class Hydrozoa, among the 30 genera are 5 families containing around 50 species in all, the family Rhopalonematidae has the greatest diversity. Description Trachymedusae are identifiable by their umbrella edge which lacks any lobes. The tentacles at the edge of the umbrellas are solid or solid and hollow, there is a thickened tissue ring that has a large number of nematocysts, the radial canals number from 4 to 6 to 8 and more than 8, though 8 is the most common amount found. The sensory clubs can be open or closed with the endodermal axis. The gonads are generally located at the radial canal or where the radial canal and the manubrium connect. The cnidome may have stenoteles. Trachymedusae reproduce sexually during the medusae stage lacking a polyp stage. Primarily found in the deep ocean, where they are recorded at depths of seventy to two thousand metres. Interactions with humans Interactions with humans are few as this spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cnidarians
Cnidaria () is a phylum under kingdom Animalia containing over 11,000 species of aquatic animals found both in freshwater and marine environments, predominantly the latter. Their distinguishing feature is cnidocytes, specialized cells that they use mainly for capturing prey. Their bodies consist of mesoglea, a non-living jelly-like substance, sandwiched between two layers of epithelium that are mostly one cell thick. Cnidarians mostly have two basic body forms: swimming medusae and sessile polyps, both of which are radially symmetrical with mouths surrounded by tentacles that bear cnidocytes. Both forms have a single orifice and body cavity that are used for digestion and respiration. Many cnidarian species produce colonies that are single organisms composed of medusa-like or polyp-like zooids, or both (hence they are trimorphic). Cnidarians' activities are coordinated by a decentralized nerve net and simple receptors. Several free-swimming species of Cubozoa and Scyphozo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Petasus (cnidarian)
A ''petasos'' or petasus ( el, πέτασος) is a broad brimmed hat of Thessalian origin worn by ancient Greeks, Thracians and Etruscans, often in combination with the chlamys cape. It was made of wool felt, leather, straw or animal skin. Women's versions had a high crown while those for men featured a lower crown. It was worn primarily by farmers, travellers and hunters, and was considered characteristic of rural people. Elite Greek men generally chose not to wear hats. As a winged hat, it became the symbol of Hermes, the Greek mythological messenger god. Along with the pileus, the petasos was the most common hat worn in Greece between 1200 and 146 B.C.E. Its wide brim protected the wearer from the sun and rain while a lengthy strap allowed wearers to secure it under the chin. When not needed, the hat was often worn hanging behind the head. Its popularity later extended to the Etruscans, the Byzantine Empire and the Roman Empire, in slightly modified forms. A type of metal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
