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Crinozoa is a subphylum of mostly sessile echinoderms, of which the crinoids, or sea lilies and feather stars, are the only extant members.[1][2] Crinozoans have an extremely extensive fossil history, which may or may not extend into the Precambrian (provided the enigmatic Ediacaran Arkarua can be positively identified as an edrioasteroid).
Crinozoa Temporal range:
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Crinoid on the reef of Batu Moncho Island, Indonesia | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Echinodermata |
Subphylum: | Crinozoa Matsumoto 1929 |
Classes | |
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Classes within Crinozoa
editThe classes currently contained within Crinozoa include Crinoidea and the extinct Paracrinoidea (Cystoidea, Edrioasteroidea, and Rhombifera).[2]
Regeneration
editSince the Paleozoic, sea lilies, or crinoids, have been able to regenerate and undergo arm autotomy or the intentional amputation of a limb. The sea lily can regenerate all of its arms at once in addition to its entire crown. Their stalk's uppermost segment and the basal plates have the capacity to regenerate the entire crown. Nutrients and other components from the stalk, especially the upper 5 cm, are used in crown regeneration.[3]
See also
edit- List of echinoderm orders
- Blastoids, superficially similar-appearing echinoderms that belong to a different echinoderm subphylum.
References
edit- ^ Newton, Alisa L.; Dennis, Michelle M. (2021-03-23), LaDouceur, Elise E.B. (ed.), "Echinodermata", Invertebrate Histology (1 ed.), Wiley, pp. 1–18, doi:10.1002/9781119507697.ch1, ISBN 978-1-119-50765-9, S2CID 261009894, retrieved 2023-08-04
- ^ a b "WoRMS - World Register of Marine Species - Crinozoa". www.marinespecies.org. Retrieved 2023-09-16.
- ^ Amemiya, Shonan; Oji, Tatsuo (June 1992). "Regeneration in sea lilies". Nature. 357 (6379): 546-547. Bibcode:1992Natur.357..546A. doi:10.1038/357546a0. ISSN 1476-4687.