Biology:Eumetazoa

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Short description: Basal animal clade as a sister group of the Porifera

Eumetazoa
Temporal range: Ediacaran - Present, 635–0 Ma
MolluscaScyphozoaChordataArthropodAnnelidaAnimalia diversity.jpg
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Scientific classification e
Domain: Eukaryota
Kingdom: Animalia
Subkingdom: Eumetazoa
Buetschli, 1910
Phyla
Synonyms
  • Enterozoa Lankester, 1877, em. Beklemishev[1][2]
  • Epitheliozoa Ax, 1996
  • Diploblast Lankester, 1873
  • Histozoa Ulrich, 1950[3][4]

Eumetazoa (from grc 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

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.Lua error: Internal error: The interpreter exited with status 1.

Evolutionary origins

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

  1. ↑ 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.
  2. ↑ 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.
  3. ↑ Ax, Peter (2012-12-06) (in en). Multicellular Animals: A new Approach to the Phylogenetic Order in Nature. Springer Science & Business Media. ISBN 9783642801143. https://books.google.com/books?id=T8fyCAAAQBAJ&q=epitheliozoa&pg=PA77. 
  4. ↑ Ulrich, W. (1950). "Begriff und Einteilung der Protozoen". in Grüneberg, H. (in de). Moderne Biologie. Festschrift zum 60. Geburtstag von Hans Nachtsheim. Berlin: Peters. pp. 241–250. 
  5. ↑ 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" (in en). Current Biology 27 (24): 3864–3870.e4. doi:10.1016/j.cub.2017.11.008. PMID 29199080. 
  6. ↑ 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. doi:10.1073/pnas.1518127112. PMID 26621703. Bibcode: 2015PNAS..11215402P. 
  7. ↑ Simion, Paul; Philippe, Hervé; Baurain, Denis; Jager, Muriel; Richter, Daniel J.; Franco, Arnaud Di; Roure, Béatrice; Satoh, Nori et al. (3 April 2017). "A Large and Consistent Phylogenomic Dataset Supports Sponges as the Sister Group to All Other Animals". Current Biology 27 (7): 958–967. doi:10.1016/j.cub.2017.02.031. PMID 28318975. https://hal.archives-ouvertes.fr/hal-01681528/file/Simion_etal2017_CurrBiol_proofs.pdf. 
  8. ↑ 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. 
  9. ↑ 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" (in en). eLife 7. doi:10.7554/elife.36278. ISSN 2050-084X. PMID 30373720. 
  10. ↑ 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" (in en). Nature 618 (7963): 110–117. doi:10.1038/s41586-023-05936-6. ISSN 1476-4687. PMID 37198475. 
  11. ↑ Martindale, Mark Q.; Kourakis, Matthew J. (1999). "Hox clusters: Size doesn't matter". Nature 399 (6738): 730–731. doi:10.1038/21530. PMID 10391234. Bibcode: 1999Natur.399..730M. 
  12. ↑ H., Philippe 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. 
  13. ↑ "Systema Naturae 2000 Taxon: Subkingdom Eumetazoa". . Retrieved February 2, 2006
  14. ↑ "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. July 2005. doi:10.1073/pnas.0503660102. PMID 15983372. Bibcode: 2005PNAS..102.9547P. 
  15. ↑ 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. 
  16. ↑ Chen, J.-Y. et al. (9 July 2004). "Small bilaterian fossils from 40 to 55 million years before the Cambrian". Science 305 (5681): 218–222. doi:10.1126/science.1099213. PMID 15178752. Bibcode: 2004Sci...305..218C. 

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External links

Lua error: Internal error: The interpreter exited with status 1. Lua error: Internal error: The interpreter exited with status 1. Wikidata ☰ Q5174 entry


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