TUNICATA : APLOUSOBRANCHIA : PolyclinidaeSEA SQUIRTS

Sidnyum elegans (Giard, 1872)


Sidnyum elegans

Description: A colonial ascidian forming firm, flattened globular masses. The colour is striking, with large white papillae around the inhalant siphons of the zooids and deep pink colouration of the colony. The arrangement of the zooids gives a meandering pattern, with exhalant canals between zooids leading to a few large exhalant openings, like oscula. Colony 50mm broad x 15mm thick.

Habitat: On moderately exposed rocky sites, usually with moderate tidal streams, attached to rock surfaces.

Distribution: A southern form in the British Isles, apparently confined to the south coasts of England ranging north to County Wexford in SE Ireland.

Similar Species: This species is superficially similar to Morchellium argus, but is not stalked. The red form of Aplidium nordmanni is very similar, but the pattern of pigmentation and arrangement of zooids is quite different. See also Sidnyum sp. which has similar internal anatomy.

Key Identification Features:

Distribution Map from BioMar data for Ireland - Google Earth map:  download this placemark (not got Google Earth installed?)

Distribution Map from NBN: Grid map (fast) : Interactive map (slow, requires login to view records) : National Biodiversity Network mapping facility, data for UK.



 Picton, B.E. & Morrow, C.C., 2010. [In] Encyclopedia of Marine Life of Britain and Ireland
http://www.habitas.org.uk/marinelife/species.asp?item=ZD510

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