they possess no tissues or organs. It reproduces asexually, budding off smaller individuals, and the lower surface may also bud off eggs into the There is no convincing fossil record of the placozoa, although the Traditionally, classification was based on their level of organization: i.e. The taxon they share, called the Epitheliozoa, is itself construed to be a sister group to the sponges (Porifera):The above view could be correct, although there is some evidence that the The principal support for such a relationship comes from special cell/cell junctions, the belt One possible scenario inspired by the proposed hypothesis starts with the idea that the monociliated cells of the epitheloid in In contrast to the model based on functional morphology described earlier, in the Epitheliozoa concept the ventral and dorsal cell layers of the Placozoa are homologs of endoderm and ectoderm, the two basic embryonic cell layers of the eumetazoans — the digestive As noted above, this hypothesis was supported in a statistical analysis of the A third hypothesis, based primarily on molecular genetics, views the Placozoa as highly simplified eumetazoans. (Retrieved on 7 July 2017) BioLib link: phylum Placozoa Grell, 1971 ; BioLib link: classis Trichoplacoidea; BioLib link: ordo Trichoplacida; BioLib link: familia Trichoplacidae; Catalogue … However this may be as a result of secondary loss, so is inadequate to demark a On the basis of their simple structure, the Placozoa were frequently viewed as a model organism for the transition from unicellular organisms to the multicellular animals (Metazoa) and are thus considered a sister taxon to all other metazoans:According to a functional-morphology model, all or most animals are descended from a Should the analysis presented above turn out to be correct, This hypothesis was supported by a recent analysis of the A concept based on purely morphological characteristics pictures the Placozoa as the nearest relative of the animals with true tissues (Eumetazoa). The following 2 files are in this category, out of 2 total. The Placozoa is usually considered to have only one species, Trichoplax adhaerens, but there is enough genetic diversity that it is possible that there are multiple, morphologically similar species. They possess eight meridionally placed ciliated plates. Some laboratory observations suggest that sexual reproduction may occur. Usually a single egg or oocyte develops in the interspace of a degenerating placozoan. All lower taxonomy nodes (111) Common name i: placozoans: Synonym i-Other names i ›placozoan: Rank i: PHYLUM: Lineage i › cellular organisms › Eukaryota › Opisthokonta › Metazoa › Eumetazoa: See also › NCBI: Tools. Trichoplax is a small, flattened, animal around a millimetre across. Placozoa (es); Placozoa (co); Placozoa (is); Placozoa (ms); Placozoa (en-gb); пластинчати (bg); Placozoa (pcd); Placozoa (ro); 絲盤蟲 (zh-hk); Placozoa (mg); Vločkovce (sk); пластинчасті (uk); 絲盤蟲 (zh-hant); 丝盘虫 (zh-cn); Placozoa (sc); 털납작벌레 (ko); Фагоцителлотәрізділер (kk); Plakozoo (eo); vločkovci (cs); Placozoa (bs); Placosoa (gv); Placozoa (fr); Placozoa (jv); Placozoa (hr); Placozoa (pt); Placozoa (vi); 丝盘虫 (zh-hans); Plakozoji (lv); Placozoa (af); плакозое (sr); Placozoa (zu); Plakdiertjes (nl); Placozoa (pt-br); 丝盘虫 (zh-sg); Placozoa (lb); Placozoa (nn); Placozoer (nb); Placozoa (az); Placozoa (min); Placozoa (bar); พลาโคซัว (th); پليڪوزوئا (sd); Placozoa (en); صفيحيات (ar); Placozoa (br); Трихоплакс (mk); Placozoa (war); Placozoa (pms); korongállatkák (hu); Placozoa (nds-nl); płaskowce (pl); Placozoa (eu); Placozoa (id); Placozoa (ast); пластинчатые (ru); Placozoa (de-ch); Placozoa (de); Placozoer (sv); Placozoa (sq); تختزیان (fa); 扁盘动物门 (zh); Placozoa (da); Placozoa (nys); センモウヒラムシ (ja); Placozoa (rm); Placozoa (nrm); Plastinkalilar (uz); Placozoa (ie); פלקוזואה (he); Placozoa (la); Placozoa (tr); प्लेकोजोआ (hi); Placozoa (ga); Laakkoeläimet (fi); Placozoa (wa); Plakbieskes (li); Plokščiagyvis (lt); Плакозое (sr-ec); Placozoa (it); Placozoa (sco); Placozoa (vls); Placozoa (fur); Placozoa (et); Placozoa (frp); Placozoa (de-at); Táyiʼ naatʼiʼí danteelígíí (nv); Placozoa (an); Placozoa (cy); Placozoa (scn); Plakozoe (sr-el); Placozoa (vo); Placozoa (io); Placozoa (kg); Placozoa (wo); Placozoa (sl); Placozoa (en-ca); Skiiwdiarten (frr); Placozoa (nap); Plakosoa (ceb); Placozoa (sw); Placozoa (gd); 絲盤蟲 (zh-tw); Placozoa (ia); Placozoa (oc); Placozoa (lij); Placozoa (gsw); Placozoos (gl); Placozoa (ca); Placozoa (vec); Placozoa (nds) basal form of invertebrate (en-ca); Stamm im Reich Tiere (Animalia) (de-at); ТАҚТАЛЫЛАР КЛАСЫ (kk-kz); stam av havslevande djur (sv); typ zwierząt (pl); basal form of invertebrate (en-gb); stam uit de onderrijk sponsachtigen (nl); тип простейших многоклеточных животных (ru); Stamm im Reich Tiere (Animalia) (de-ch); Stamm im Reich Tiere (Animalia) (gsw); 판형동물문에 속하는 동물의 총칭 (ko); basal form of invertebrate (en); شعبة من الحيوانات (ar); Stamm im Reich Tiere (Animalia) (de); korongállatka törzs (hu) Placozoos, Placozoo (es); Placozoa (hu); Placozous, Placozou (ca); Scheibentiere, Plattentiere (de); 絲盤蟲目, 絲盤蟲屬, 絲盤蟲綱, 絲盤蟲科, 扁盘动物, 絲盤蟲 (zh); En ilkel çokhücreli, En ilkel çokhücreliler (tr); 平板動物, 板状動物 (ja); Plakulovce, Placozoa (sk); Trichoplax (he); Placozoa (uz); Placozoa (frr); Plakozoulo, Placozoa (eo); Placozoa (cs); Placozoa (gv); Placozoaires, Placozoaire (fr); Placozoaris (oc); Placozoa (sv); Placozoa (sr-el); Plokščiagyviai, Placozoa (lt); Placozoa (lv); Placozoa, Phagocytellozoa, Placozoo (gl); Placozoa (nv); Placozoa (fi); Трихоплакоїди, Трептоплакс мичкуватий, Трихоплакс адгеренс, Treptoplax reptans, Трихоплациди, Тип Пластинчасті, Phagocytellozoa, Трептоплакс, Placozoa, Трихоплацидові, Трихоплакс (uk); Phagocytellozoa, Placozoi (it); Placozoa (bg); Placozoa (ceb); Placozoa (pl); Placozoa (nb); Lövhəcikkimilər (az); Placozoa, Phagocytellozoa, фагоцителлообразные, плакозои (ru); Placozoa, Phagocytellozoa (nl); Трихоплакс, Placozoa (sr); Placozoa (th); placozoans (en); Placozoa (ar); Placozoa (li); 판형동물, 털납작벌레과, 털납작벌레속, 판형동물문, 털납작벌레강, 털납작벌레목 (ko) They have very simple tissue organization, with only two layers of cells, and radial symmetry. According to this, Various studies in this regard so far yield differing results for identifying the exact sister group: in one case the Placozoa would qualify as the nearest relatives of the Cnidaria, while in another they would be a sister group to the Ctenophora, and occasionally they are placed directly next to the Bilateria.
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