Eutely

A mature gastrotrich, with visible cells on the surface. Further growth will now occur solely by cell enlargement.

Eutelic organisms have a fixed number of somatic cells when they reach maturity, the exact number being constant for any one species. Development proceeds by cell division until maturity; further growth occurs via cell enlargement only. This growth is known as auxetic growth. It is shown by members of phylum Aschelminthes.

Most eutelic organisms are microscopic. Examples include the rotifers, ascaris, many species of nematodes (including the model organism Caenorhabditis elegans whose male individuals have 1,033 cells[1][2]), tardigrades, larvacea and dicyemida.[3][4]

References

  1. ↑ Sammut, Michele; Cook, Steven J.; Nguyen, Ken C. Q.; Felton, Terry; Hall, David H.; Emmons, Scott W.; Poole, Richard J.; Barrios, Arantza (October 2015). "Glia-derived neurons are required for sex-specific learning in C. elegans". Nature. 526 (7573): 385–390. Bibcode:2015Natur.526..385S. doi:10.1038/nature15700. ISSN 0028-0836. PMC 4650210. PMID 26469050.
  2. ↑ Ruppert, Edward E.; Fox, Richard, S.; Barnes, Robert D. (2004). Invertebrate Zoology (7th ed.). Cengage Learning. p. 753. ISBN 978-81-315-0104-7.
  3. ↑ "How many cells are there in an organism?" (PDF). Archived from the original (PDF) on 2016-03-10. Retrieved 2016-02-29.
  4. ↑ "Miscellaneous characters - Contributions to Zoology". Archived from the original on 2016-10-06. Retrieved 2016-02-29.


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