Biology:Aplidium elegans

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Short description: Species of sea squirt

Aplidium elegans
Aplidium elegans.jpg
Scientific classification edit
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Subphylum: Tunicata
Class: Ascidiacea
Order: Aplousobranchia
Family: Polyclinidae
Genus: Aplidium
Species:
A. elegans
Binomial name
Aplidium elegans
(Giard, 1872)[1]
Synonyms
  • Fragarium elegans Giard, 1872 (original combination)
  • Fragaroides aurantiacum (Maurice, 1888)
  • Parascidia elegans (Giard, 1872)
  • Sidnyum elegans (Giard, 1872)

Aplidium elegans, the sea-strawberry, is a species of colonial sea squirt, a tunicate that is a benthic invertebrate in the family Polyclinidae and class Ascidiacea.[2] It is native to shallow waters in the Atlantic Ocean and Mediterranean Sea.[2] It is also found in between France and the United Kingdom.[2]

Description

Aplidium elegans form firm, flattened globular masses, that look like pink cushions from 3 to 4 cm long.[3] The color is striking, with large white papillae around the inhalant siphons of the zooids and deep pink coloration of the colony.[3] The arrangement of the zooids in the colony gives a meandering pattern, with cloacal canals between zooids.[3] The zooids are embedded in a common test and grouped around sinuous, irregular cloacal canals.[2] The oral siphons are slightly prominent and bordered of eight small white lobes.[2] Colonial ascidians, like other benthic invertebrates show great morphological variability in terms of shape, size and color in response to both genetic characteristics and local environmental conditions.[4]

Distribution and habitat

Aplidium elegans is found in the Atlantic Ocean, Mediterranean Sea, and the English Channel.[4] The colonies are found on rocks in waters 5 meters to 20 meters deep.[4] Also can be found on moderately exposed rocky sites, usually with moderate tidal streams, attached to rocks.[3] The colony is around 50mm broad and 15mm thick.[3]

Biology

Aplidium elegans colony is made up of a couple different parts.[4] The zooid is the individual animal, and in a colony, there are multiple zooids.[4] The colony has a test or tunica which is a thick layer secreted by the mantle, containing cellulose and protecting the animal.[4] Every zooid has an oral siphon, which is an opening through which water is drawn into the ascidian to collect nutrients.[4] Each individual also has a cloaca through which water is expelled.[4]

References

  1. Giard, A. (1872). Recherches sur les Ascidies composées ou Synascidies. Archives de Zoologie Expérimentale et Générale. 1, pages 501-687, pls. 25-30
  2. 2.0 2.1 2.2 2.3 2.4 Bay-Nouailhat A., September 2005, Description of Aplidium elegans, Available on line at http://www.european-marine-life.org/32/aplidium-elegans.php, consulted on 02 March 2019.
  3. 3.0 3.1 3.2 3.3 3.4 Gabriele, M.; Bellot, A.; Gallotti, D.; Brunetti, R. (1999). Sublittoral hard substrate communities of the Northern Adriatic Sea. Cah. Biol. Mar. 40(1): 65-76
  4. 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 Murugan R, Ananthan G., Arunkman A. (2018) Aplousobranchia ascidians in Andaman and Nicobar Islands: a combined morphological and molecular discrimination. Mitochondrial DNA Part A, 29, 879-884.

Wikidata ☰ Q4925941 entry