|Researched by||Eliza Gibson-Hall||Refereed by||This information is not refereed.|
|Other common names||-||Synonyms||Ascidia parallelogramma Mueller, 1776|
This rectangular ascidian is laterally compressed with a thin, transparent test. Corella parallelogramma is 30-50 mm tall and 20-30 mm broad. The branchial sac (gill) and gut are clearly visible. The branchial sac is commonly marked with yellow and/or red pigments occurring in a criss-cross pattern. The gut is located to the right of the branchial sac. The intestine can be seen as a grey tube running along the base and up the side of the body. Gonads occur either in or around the intestinal loop. The atrial siphon is usually short but for some individuals, it is very long. Oral siphons have red eyespots (ocelli). It attaches itself to substratum via a small part of its base. This is a unitary species.
Recorded around the entire British Isles.
Records from the British Isles, North Sea, Norway to the Mediterranean. There is a single record in the Gulf of Alaska and recorded above Norway in the Arctic Circle.
Found from shallow water to 200 m. Grows on rocks, stones, shells, and Laminaria, preferring clear water. This species likes a fair amount of water movement and therefore, usually occurs in areas of strong currents.
No other ascidian species is the same shape as Corella parallelogramma or as transparent. The most similar species is Ascidiella scabra which is only partially transparent with some coloured markings on the branchial sac.
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De Kluijver, M.J. & Ingalsuo, S.S., 2018. Corella parallelogramma. Macrobenthos of the North Sea - tunicata marine species identification portal ETI bioinformatics. (20.07.18). http://species-identification.org/species.php?species_group=tunicata&id=25
Hayward, P.J. & Ryland, J.S. (ed.) 1995b. Handbook of the marine fauna of North-West Europe. Oxford: Oxford University Press.
Millar, R.H., 1970. British Ascidians London: Academic Press.[Synopses of the British Fauna, no. 1.]
Picton, B.E. & Morrow, C.C., 2016. Corella parallelogramma (O F Müller, 1776). Encyclopedia of marine life of Britain and Ireland, (20.06.2018). http://www.habitas.org.uk/marinelife/species.asp?item=ZD1350
This review can be cited as:
Last Updated: 22/08/2018