Eumetazoa
Eumetazoa | |
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Scientific classification ![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Subkingdom: | Eumetazoa Buetschli, 1910 |
Subdivisions | |
Synonyms | |
Eumetazoa (from Ancient Greek εὖ (eû) 'well' μετά (metá) 'after' and ζῷον (zôion) 'animal'), also known as diploblasts, Epitheliozoa or Histozoa, are a proposed basal animal clade as a sister group of Porifera (sponges).[5][6][7][8][9] The basal eumetazoan clades are the Ctenophora and the ParaHoxozoa. Placozoa is now also seen as a eumetazoan in the ParaHoxozoa. The competing hypothesis is the Myriazoa clade.[10]
Several other extinct or obscure life forms, such as Iotuba and Thectardis, appear to have emerged in the group.[11] Characteristics of eumetazoans include true tissues organized into germ layers, the presence of neurons and muscles, and an embryo that goes through a gastrula stage.
Some phylogenists once speculated the sponges and eumetazoans evolved separately from different single-celled organisms, which would have meant that the animal kingdom does not form a clade (a complete grouping of all organisms descended from a common ancestor). However, genetic studies and some morphological characteristics, like the common presence of choanocytes, now unanimously support a common origin.[12]
Traditionally, eumetazoans are a major group of animals in the Five Kingdoms classification of Lynn Margulis and K. V. Schwartz, comprising the Radiata and Bilateria – all animals except the sponges.[13] When treated as a formal taxon Eumetazoa is typically ranked as a subkingdom. The name Metazoa has also been used to refer to this group, but more often refers to the Animalia as a whole. Many classification schemes do not include a subkingdom Eumetazoa.
Taxonomy
[edit]A widely accepted hypothesis, based on molecular data (mostly 18S rRNA sequences), divides Bilateria into four superphyla: Deuterostomia, Ecdysozoa, Lophotrochozoa, and Platyzoa (sometimes included in Lophotrochozoa). The last three groups are also collectively known as Protostomia.[citation needed]
However, some skeptics[who?] emphasize inconsistencies in the new data. The zoologist Claus Nielsen argues in his 2001 book Animal Evolution: Interrelationships of the Living Phyla for the traditional divisions of Protostomia and Deuterostomia.[citation needed]
Evolutionary origins
[edit]It has been suggested that one type of molecular clock and one approach to interpretation of the fossil record both place the evolutionary origins of eumetazoa in the Ediacaran.[14] However, the earliest eumetazoans may not have left a clear impact on the fossil record and other interpretations of molecular clocks suggest the possibility of an earlier origin.[15] The discoverers of Vernanimalcula describe it as the fossil of a bilateral triploblastic animal that appeared at the end of the Marinoan glaciation prior to the Ediacaran period, implying an even earlier origin for eumetazoans.[16]
References
[edit]- ^ Lankester, Ray (1877). "Notes on the Embryology and classification of the Animal kingdom: comprising a revision of speculations relative to the origin and significance of the germ-layers". Quarterly Journal of Microscopical Science (N.S.), No. 68: 399–454.
- ^ Beklemishev, V. L. The basis of the comparative anatomy of the invertebrates [Основы сравнительной анатомии беспозвоночных]. 1st ed., 1944; 2nd ed., 1950; 3rd ed. (2 vols.), 1964. English translation, 1969, [1]. Akademia Nauk, Moscow, Leningrad.
- ^ Ax, Peter (2012-12-06). Multicellular Animals: A new Approach to the Phylogenetic Order in Nature. Springer Science & Business Media. ISBN 9783642801143.
- ^ Ulrich, W. (1950). "Begriff und Einteilung der Protozoen". In Grüneberg, H. (ed.). Moderne Biologie. Festschrift zum 60. Geburtstag von Hans Nachtsheim (in German). Berlin: Peters. pp. 241–250.
- ^ Feuda, Roberto; Dohrmann, Martin; Pett, Walker; Philippe, Hervé; Rota-Stabelli, Omar; Lartillot, Nicolas; Wörheide, Gert; Pisani, Davide (2017). "Improved Modeling of Compositional Heterogeneity Supports Sponges as Sister to All Other Animals". Current Biology. 27 (24): 3864–3870.e4. doi:10.1016/j.cub.2017.11.008. hdl:10449/43929. PMID 29199080.
- ^ Pisani, Davide; Pett, Walker; Dohrmann, Martin; Feuda, Roberto; Rota-Stabelli, Omar; Philippe, Hervé; Lartillot, Nicolas; Wörheide, Gert (15 December 2015). "Genomic data do not support comb jellies as the sister group to all other animals". Proceedings of the National Academy of Sciences. 112 (50): 15402–15407. Bibcode:2015PNAS..11215402P. doi:10.1073/pnas.1518127112. PMC 4687580. PMID 26621703.
- ^ Simion, Paul; Philippe, Hervé; Baurain, Denis; Jager, Muriel; Richter, Daniel J.; Franco, Arnaud Di; Roure, Béatrice; Satoh, Nori; Quéinnec, Éric (3 April 2017). "A Large and Consistent Phylogenomic Dataset Supports Sponges as the Sister Group to All Other Animals" (PDF). Current Biology. 27 (7): 958–967. doi:10.1016/j.cub.2017.02.031. PMID 28318975. S2CID 4560353.
- ^ Giribet, Gonzalo (1 October 2016). "Genomics and the animal tree of life: conflicts and future prospects". Zoologica Scripta. 45: 14–21. doi:10.1111/zsc.12215.
- ^ Laumer, Christopher E; Gruber-Vodicka, Harald; Hadfield, Michael G; Pearse, Vicki B; Riesgo, Ana; Marioni, John C; Giribet, Gonzalo (2018-10-30). "Support for a clade of Placozoa and Cnidaria in genes with minimal compositional bias". eLife. 7. doi:10.7554/elife.36278. ISSN 2050-084X. PMC 6277202. PMID 30373720.
- ^ Schultz, Darrin T.; Haddock, Steven H. D.; Bredeson, Jessen V.; Green, Richard E.; Simakov, Oleg; Rokhsar, Daniel S. (2023-05-17). "Ancient gene linkages support ctenophores as sister to other animals". Nature. 618 (7963): 110–117. doi:10.1038/s41586-023-05936-6. ISSN 1476-4687. PMC 10232365. PMID 37198475.
- ^ Martindale, Mark Q.; Kourakis, Matthew J. (1999). "Hox clusters: Size doesn't matter". Nature. 399 (6738): 730–731. Bibcode:1999Natur.399..730M. doi:10.1038/21530. PMID 10391234. S2CID 43414178.
- ^ H., Philippe; Derelle, R.; Lopez, P.; et al. (April 2009). "Phylogenomics revives traditional views on deep animal relationships". Current Biology. 19 (8): 706–712. doi:10.1016/j.cub.2009.02.052. PMID 19345102. S2CID 15282843.
- ^ "Systema Naturae 2000 Taxon: Subkingdom Eumetazoa". Archived 2009-03-22 at the Wayback Machine. Retrieved February 2, 2006
- ^ Peterson KJ, Butterfield NJ (July 2005). "Origin of the Eumetazoa: testing ecological predictions of molecular clocks against the Proterozoic fossil record". Proc. Natl. Acad. Sci. U.S.A. 102 (27): 9547–52. Bibcode:2005PNAS..102.9547P. doi:10.1073/pnas.0503660102. PMC 1172262. PMID 15983372.
- ^ Blair, J. E.; Hedges, S. B. (March 2005). "Molecular clocks do not support the Cambrian explosion". Molecular Biology and Evolution. 22 (3): 387–390. doi:10.1093/molbev/msi039. PMID 15537810.
- ^ Chen, J.-Y.; Bottjer, D.J.; Oliveri, P.; Dornbos, S.Q.; Gao, F.; Ruffins, S.; Chi, H.; Li, C.-W.; Davidson, E.H.; et al. (9 July 2004). "Small bilaterian fossils from 40 to 55 million years before the Cambrian". Science. 305 (5681): 218–222. Bibcode:2004Sci...305..218C. doi:10.1126/science.1099213. PMID 15178752. S2CID 115443209.
External links
[edit]![](http://upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/d/df/Wikispecies-logo.svg/34px-Wikispecies-logo.svg.png)
- Bilateria. Tree of Life web project, US National Science Foundation. 2002. 6 January 2006.
- Invertebrates and the Origin of Animal Diversity
- Evers, Christine A., Lisa Starr. Biology:Concepts and Applications. 6th ed. United States:Thomson, 2006. ISBN 0-534-46224-3.
- TRICHOPLAX ADHAERENS (PLACOZOA TYPE) St. Petersburg. 2005
- Metazoa: the Animals
- Nielsen, C. 2001. Animal Evolution: Interrelationships of the Living Phyla, 2nd edition, 563 pp. Oxford Univ. Press, Oxford. ISBN 0-19-850681-3
- Borchiellini, C. Manuel; Alivon, E.; Boury-Esnault, N.; Vacelet, J.; Le-Parco, Y. (2001). "Sponge paraphyly and the origin of Metazoa". Journal of Evolutionary Biology. 14 (1): 171–179. doi:10.1046/j.1420-9101.2001.00244.x. PMID 29280585. S2CID 25119754.
- Peterson, Kevin J.; McPeek, Mark A.; Evans, David A.D. (2005). "Tempo & mode of early animal evolution: inferences from rocks, Hox, & molecular clocks". Paleobiology. 31 (Supp 2): 36–55. doi:10.1666/0094-8373(2005)031[0036:TAMOEA]2.0.CO;2. S2CID 30787918.