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Platyctenida
Platyctenida is an order of comb jellies. Taxonomy Platyctenida is the only benthic group of organisms in the phylum Ctenophora. Platyctenida are considered to be a phylogenetically young group along with the orders Lobata and Beroida and are believed to have stemmed from an ancestral version of the order Cydippida, after some kind of bottleneck effect in the phylum. This has been supported by strong morphological and developmental data, specifically the sharing of what has been termed a "Cydippida-like" larva form in all 4 orders. Platyctenida is thought to be a polyphyletic group. Description Ranging in size 15 cm and below, they have dorsalventrally flattened, oval bodies and secondarily bilaterally symmetrical, platyctenids look very much like nudibranchs or flatworms and are often confused for them. All but 1 species of platyctenids do not possess the iconic ctene rows (the ciliated comb-rows) that distinguishes the Ctenophores but they still possess the pair of ten ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Platyctenidae
Platyctenidae is a family of ctenophores belonging to the order Platyctenida.WoRMSPlatyctenidae/ref> Formerly, '' Tjalfiella'' Mortensen was classified in this familyTaku Komai49. A New Remarkable Sessile Ctenophore Proceedings of the Imperial Academy. 17(6): 216-220. Institute of Zoology, Kyoto Imperial University, June 12, 1941. but appears now to be a member of ist own family Tjalfiellidae.WoRMSTjalfiellidae Komai, 1922/ref> World Register of Marine Species The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive list of names of marine organisms. Content The content of the registry is edited and maintained by scientific specialist ... (WoRMS) does not list any (remaining) members of the family (as of Nov. 2021), though indicating it as validly published. Therefore it remains unclear if Platyctenidae might be a synonym of Tjalfiellidae. References Tentaculata {{ctenophore-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ctenophores
Ctenophora (; ctenophore ; ) comprise a phylum of marine invertebrates, commonly known as comb jellies, that inhabit sea waters worldwide. They are notable for the groups of cilia they use for swimming (commonly referred to as "combs"), and they are the largest animals to swim with the help of cilia. Depending on the species, adult ctenophores range from a few millimeters to in size. Only 100 to 150 species have been validated, and possibly another 25 have not been fully described and named. The textbook examples are cydippids with egg-shaped bodies and a pair of retractable tentacles fringed with tentilla ("little tentacles") that are covered with colloblasts, sticky cells that capture prey. Their bodies consist of a mass of jelly, with a layer two cells thick on the outside, and another lining the internal cavity. The phylum has a wide range of body forms, including the egg-shaped cydippids with retractable tentacles that capture prey, the flat generally combless pla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Comb Jelly
Ctenophora (; ctenophore ; ) comprise a phylum of marine invertebrates, commonly known as comb jellies, that inhabit sea waters worldwide. They are notable for the groups of cilia they use for swimming (commonly referred to as "combs"), and they are the largest animals to swim with the help of cilia. Depending on the species, adult ctenophores range from a few millimeters to in size. Only 100 to 150 species have been validated, and possibly another 25 have not been fully described and named. The textbook examples are cydippids with egg-shaped bodies and a pair of retractable tentacles fringed with tentilla ("little tentacles") that are covered with colloblasts, sticky cells that capture prey. Their bodies consist of a mass of jelly, with a layer two cells thick on the outside, and another lining the internal cavity. The phylum has a wide range of body forms, including the egg-shaped cydippids with retractable tentacles that capture prey, the flat generally combless pla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tjalfiellidae
Tjalfiellidae is a family of ctenophores belonging to the order Platyctenida. Genera: * '' Tjalfiella'' Mortensen, 1910 '' Tjalfiella'' is recorded by Mortensen (1912) from deep water off Greenland, originally classified as member of Platyctenidae Platyctenidae is a family of ctenophores belonging to the order Platyctenida.WoRMSPlatyctenidae/ref> Formerly, '' Tjalfiella'' Mortensen was classified in this familyTaku Komai49. A New Remarkable Sessile Ctenophore Proceedings of the Imperial Ac .... Its whole length is about 14 cm, the width is 12 cm — smaller than '' Lyrocteis imperatoris''.Taku Komai49. A New Remarkable Sessile Ctenophore Proceedings of the Imperial Academy. 17(6): 216-220. Institute of Zoology, Kyoto Imperial University, June 12, 1941. References Tentaculata {{ctenophore-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coeloplana Astericola
''Coeloplana astericola'', the creeping comb jelly, is a species of benthic comb jelly from the tropical western Indo-Pacific region that lives as an episymbiont on starfish such as '' Echinaster luzonicus''. Description Platyctenids are unlike most other comb jellies in being bottom dwellers. They resemble flatworms in general appearance, being flattened dorso-ventrally and roughly oval in shape. The comb rows bearing bands of cilia, typical of comb jellies, are absent, but the anterior end of the animal bears a pair of well-developed, retractable tentacles that can be extended for feeding. The underside of the comb jelly is a "creeping sole", formed from the everted lining of the pharynx, and on this it can move over the surface of the starfish. It has irregular red and white markings. Ecology This comb jelly lives symbiotically on the aboral (upper) surface of starfish such as the banded bubble star, '' Echinaster callosus'', and the Luzon sea star, '' Echinaster luzonicus'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Savangiidae
Savangiidae is a family of ctenophores belonging to the order Platyctenida Platyctenida is an order of comb jellies. Taxonomy Platyctenida is the only benthic group of organisms in the phylum Ctenophora. Platyctenida are considered to be a phylogenetically young group along with the orders Lobata and Beroida and are .... Genera: * '' Savangia'' Dawydoff, 1950 References Tentaculata {{ctenophore-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lyroctenidae
''Lyrocteis'' is a genus of benthic comb jellies. It is the only genus in the monotypic family Lyroctenidae. Morphology The individuals are rather large benthic ctenophores (up to 15 cm) in the shape of a lyre. They have a basal body and two curved outgrowths, from which the fishing filaments emanate, which they use to capture their planktonic food.Taku Komai49. A New Remarkable Sessile Ctenophore Proceedings of the Imperial Academy. 17(6): 216-220. Institute of Zoology, Kyoto Imperial University, June 12, 1941. Species The genus comprises the following species:World Register of Marine Species The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive list of names of marine organisms. Content The content of the registry is edited and maintained by scientific specialist ...''Lyrocteis'' Komai, 1941 /ref> * '' Lyrocteis flavopallidus'' Robilliard and Dayton, 1972 * '' Lyrocteis imperatoris'' Komai, 1941 R ... [...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] |
Ctenoplanidae
''Ctenoplana'' is a genus of comb jellies, and the only genus in the family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ... Ctenoplanidae. It comprises the following species: * '' Ctenoplana agnae'' (Dawydoff, 1929) * '' Ctenoplana bengalensis'' Gnanamuthu and Nair, 1948 * '' Ctenoplana caulleryi'' Dawydoff, 1936 * '' Ctenoplana duboscqui'' Dawydoff, 1929 * '' Ctenoplana korotneffi'' Willey, 1896 * '' Ctenoplana kowalevskii'' Korotneff, 1886 * '' Ctenoplana maculomarginata'' (Yoshi, 1933) * '' Ctenoplana muculosa'' (Yoshi, 1933) * '' Ctenoplana neritica'' Fricke & Plante, 1971 * '' Ctenoplana perrieri'' (Dawydoff, 1930) * '' Ctenoplana rosacea'' Willey, 1896 * '' Ctenoplana yurii'' (Dawydoff, 1929) References External links Ctenophore genera {{Ctenophore-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Benthic
The benthic zone is the ecological region at the lowest level of a body of water such as an ocean, lake, or stream, including the sediment surface and some sub-surface layers. The name comes from ancient Greek, βένθος (bénthos), meaning "the depths." Organisms living in this zone are called benthos and include microorganisms (e.g., bacteria and fungi) as well as larger invertebrates, such as crustaceans and polychaetes. Organisms here generally live in close relationship with the substrate and many are permanently attached to the bottom. The benthic boundary layer, which includes the bottom layer of water and the uppermost layer of sediment directly influenced by the overlying water, is an integral part of the benthic zone, as it greatly influences the biological activity that takes place there. Examples of contact soil layers include sand bottoms, rocky outcrops, coral, and bay mud. Description Oceans The benthic region of the ocean begins at the shore line (intertidal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polyphyletic
A polyphyletic group is an assemblage of organisms or other evolving elements that is of mixed evolutionary origin. The term is often applied to groups that share similar features known as homoplasies, which are explained as a result of convergent evolution. The arrangement of the members of a polyphyletic group is called a polyphyly .. ource for pronunciation./ref> It is contrasted with monophyly and paraphyly. For example, the biological characteristic of warm-bloodedness evolved separately in the ancestors of mammals and the ancestors of birds; "warm-blooded animals" is therefore a polyphyletic grouping. Other examples of polyphyletic groups are algae, C4 photosynthetic plants, and edentates. Many taxonomists aim to avoid homoplasies in grouping taxa together, with a goal to identify and eliminate groups that are found to be polyphyletic. This is often the stimulus for major revisions of the classification schemes. Researchers concerned more with ecology than with systema ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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