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Actinulida
Actinulida are an order of hydrozoans in the subclass Trachylinae Trachylinae (also Trachylina, Trachylinida, etc.) is a subclass of hydrozoans. It is placed at order rank in many older classifications, and limited to contain the Narcomedusae, Trachymedusae, the Actinulidae, then considered an independent orde .... Very small, medusoid Hydrozoa without polyp phase, living in the sand interstitial, solitary, bell entirely or very much reduced, epidermis ciliated, 1-2 whorls of tentacles, statocysts present or not, club shaped and derived of ecto- and entodermal tissue; cnidome may include stenoteles. References Cnidarian orders Trachylinae {{Hydrozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrozoa
Hydrozoa (hydrozoans; ) are a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most of which inhabit saline water. The colonies of the colonial species can be large, and in some cases the specialized individual animals cannot survive outside the colony. A few genera within this class live in freshwater habitats. Hydrozoans are related to jellyfish and corals and belong to the phylum Cnidaria. Some examples of hydrozoans are the freshwater jelly (''Craspedacusta sowerbyi''), freshwater polyps ('' Hydra''), ''Obelia'', Portuguese man o' war (''Physalia physalis''), chondrophores (Porpitidae), "air fern" (''Sertularia argentea''), and pink-hearted hydroids (''Tubularia''). Anatomy Most hydrozoan species include both a polyp (zoology), polypoid and a medusa (biology), medusoid stage in their lifecycles, although a number of them have only one or the other. For example, ''Hydra'' has no medusoid stage, while ''Liriope tetraphylla, Lir ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Actinulida
Actinulida are an order of hydrozoans in the subclass Trachylinae Trachylinae (also Trachylina, Trachylinida, etc.) is a subclass of hydrozoans. It is placed at order rank in many older classifications, and limited to contain the Narcomedusae, Trachymedusae, the Actinulidae, then considered an independent orde .... Very small, medusoid Hydrozoa without polyp phase, living in the sand interstitial, solitary, bell entirely or very much reduced, epidermis ciliated, 1-2 whorls of tentacles, statocysts present or not, club shaped and derived of ecto- and entodermal tissue; cnidome may include stenoteles. References Cnidarian orders Trachylinae {{Hydrozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trachylinae
Trachylinae (also Trachylina, Trachylinida, etc.) is a subclass of hydrozoans. It is placed at order rank in many older classifications, and limited to contain the Narcomedusae, Trachymedusae, the Actinulidae, then considered an independent order, and also the Limnomedusae which were traditionally placed in the paraphyletic "Hydroida". It is not entirely clear whether the Limnomedusae and the Trachymedusae as conventionally circumscribed are monophyletic The freshwater jelly ''Craspedacusta sowerbyi'' is a well-known member of the Limnomedusae and might thus belong here. Development Of the four orders: Narcomedusae, Trachymedusae, Actinulidae, and Limnomedusae, only Limnomedusae has any sort of polyp stage, and even then it is very tiny(less than 1mm) with no tentacles. This is uncommon for other jellyfish under the phylum cnidaria. These jellyfish also tend to have fewer cells during their embryonic and larvae A larva (; plural larvae ) is a distinct juvenile form many ani ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Halammohydridae
Halammohydridae is a family of cnidarians belonging to the order Actinulida Actinulida are an order of hydrozoans in the subclass Trachylinae Trachylinae (also Trachylina, Trachylinida, etc.) is a subclass of hydrozoans. It is placed at order rank in many older classifications, and limited to contain the Narcomedusa .... Genera: * '' Halammohydra'' Remane, 1927 References Actinulida Cnidarian families {{hydrozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Otohydridae
''Otohydra'' is a genus of cnidarians belonging to the monotypic family Otohydridae. Species: *''Otohydra tremulans'' *''Otohydra vagans ''Otohydra'' is a genus of cnidarians belonging to the monotypic family Otohydridae. Species: *''Otohydra tremulans'' *''Otohydra vagans'' References Actinulida Hydrozoan genera {{hydrozoa-stub ...'' References Actinulida Hydrozoan genera {{hydrozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bertil Swedmark
Bertil is a first name of Germanic origin most commonly found among Swedish men. The oldest recorded use is from the year 1396, but the name did not come into widespread use until the 19th century. People called Bertil include: * Carl Bertil Agnestig (born 1924), Swedish music teacher and composer * Bertil Ahlin (1927–2008), Swedish bantamweight boxer *Bertil Albertsson (1921–2008), Swedish runner *Bertil Almgren (1918–2011), Swedish archaeologist *Bertil Almqvist (1902–1972), nicknamed Bertila and Trallgöken, Swedish author and illustrator *Bertil Anderberg (1913–1991), Swedish film actor *Bertil Andersson FAA FIC, third President of Nanyang Technological University (NTU) *Bertil Antonsson (1921–2006), Swedish heavyweight wrestler *Bertil Bäckvall (1923–2012), Swedish footballer and football manager * Bertil W. Benson (1843–1907), Norwegian-born American politician * Bertil Berg (1910–1989), Swedish water polo player who competed in the 1936 Summer Olympics *Be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Georges Teissier
Georges Teissier (19 February 1900 – 7 January 1972) was a mathematical biologist who contributed to the modern synthesis with quantitative methods. Along with Philippe L'Heritier he developed methods of studying ''Drosophila'' genetics in what are known as population cages. They established a French school of population genetics that was largely unknown outside. Teissier was born in Paris where his parents were schoolteachers with a Calvinist upbringing. Growing up with an interest in natural history, he studied mathematics at the École Normale Supérieure from 1919. He took an interest in marine biology, studying Cnidaria. He examined anisotropy and polarity in early development. In 1927 he examined the mathematics of animal growth and developed biometric methods. His dissertation in 1931 was on the development of ''Tenebrio molitor'' and ''Galleria mellonella'' in which he described allometric growth using log-transformed growth curves. He also developed methods of correlation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Order (biology)
Order ( la, wikt:ordo#Latin, ordo) is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between Family_(biology), family and Class_(biology), class. In biological classification, the order is a taxonomic rank used in the classification of organisms and recognized by the nomenclature codes. An immediately higher rank, superorder, is sometimes added directly above order, with suborder directly beneath order. An order can also be defined as a group of related families. What does and does not belong to each order is determined by a taxonomist, as is whether a particular order should be recognized at all. Often there is no exact agreement, with different taxonomists each taking a different position. There are no hard rules that a taxonomist needs to follow in describing or recognizing an order. Some taxa are accepted almost universally, while others are recognized only rarely. The name of an order is usually written with a capital letter. Fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cnidarian Orders
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] |
