Biology:Paratomy
Paratomy is a form of asexual reproduction in animals where the organism splits in a plane perpendicular to the antero-posterior axis and the split is preceded by the "pregeneration" of the anterior structures in the posterior portion. The developing organisms have their body axis aligned, i.e., they develop in a head to tail fashion. Budding can be considered to be similar to paratomy except that the body axes need not be aligned: the new head may grow toward the side or even point backward (e.g. Convolutriloba retrogemma an acoel flat worm).[1][2] In animals that undergo fast paratomy a chain of zooids packed in a head to tail formation may develop. Many oligochaete annelids,[3] acoelous turbellarians,[1] echinoderm larvae[4] and coelenterates[5] reproduce by this method.
See also
- Biology:Autotomy – Self-amputation
External resources
This paper has a detailed description of the changes during paratomy.[3]
References
- ↑ 1.0 1.1 Åkesson, Bertil; Robert Gschwentner; Jan Hendelberg; Peter Ladurner; Johann Müller; Reinhard Rieger (2001-12-01). "Fission in Convolutriloba longifissura: asexual reproduction in acoelous turbellarians revisited". Acta Zoologica 82 (3): 231–239. doi:10.1046/j.1463-6395.2001.00084.x. ISSN 1463-6395. http://homepage.uibk.ac.at/~c719135/pdf/Akesson-Gschwentner-2001.pdf. Retrieved 2011-07-13.
- ↑ Egger, Bernhard (December 2008). "Regeneration: rewarding, but potentially risky". Birth Defects Research Part C: Embryo Today: Reviews 84 (4): 257–264. doi:10.1002/bdrc.20135. ISSN 1542-9768. PMID 19067421. http://www.uibk.ac.at/zoology/staff/egger/images/egger-regeneration-review-2008.pdf. Retrieved 2011-07-13.
- ↑ 3.0 3.1 Herlant-Meewis, Henriette (1950-10-01). "Cyst-Formation in Aeolosoma Hemprichi (Ehr)". Biological Bulletin 99 (2): 173–180. doi:10.2307/1538737. ISSN 0006-3185. PMID 14791418. https://www.biodiversitylibrary.org/part/33169.
- ↑ Jaeckle, William B. (1994-02-01). "Multiple Modes of Asexual Reproduction by Tropical and Subtropical Sea Star Larvae: An Unusual Adaptation for Genet Dispersal and Survival". Biological Bulletin 186 (1): 62–71. doi:10.2307/1542036. ISSN 0006-3185. PMID 29283296. https://digitalcommons.iwu.edu/cgi/viewcontent.cgi?article=1029&context=bio_scholarship.
- ↑ Raikova, Ekaterina V. (1994-02-01). "Life Cycle, Cytology, and Morphology of Polypodium hydriforme, a Coelenterate Parasite of the Eggs of Acipenseriform Fishes". The Journal of Parasitology 80 (1): 1–22. doi:10.2307/3283338. ISSN 0022-3395. PMID 7905920.
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