Lesser gooseberry sea squirt (Distomus variolosus)
|Researched by||Olwen Ager||Refereed by||Admin|
|Other common names||-||Synonyms||-|
Recorded distribution in Britain and IrelandDistomus variolosus has been recorded in west Sussex, south Devon and Cornwall, Lundy, south and south-west Wales, south-east and western Ireland, north Wales, Isle of Man and the sound between Gighay and Hellisay in the Outer Hebrides.
Global distributionDistomus variolosus is recorded south of the British Isles to Portugal.
HabitatDistomus variolosus is found on rocks, stones, around the bases of hydroids and on macroalgae, especially on the holdfasts of Laminaria hyperborea.
- Closely grouped cylindridal or ovoid zooids, up to 1 cm high.
- Zooids united at base or side but mostly free.
- Red to brown in colour.
- Both siphons at upper end of each zooid.
Additional informationDistomus variolosus may be confused with the baked bean ascidian, Dendrodoa grossularia, or another sea squirt Stolonica socialis. The internal anatomy is important when distinguishing between species. However, the siphons of Dendrodoa grossularia are more conspicuous than those of Distomus variolus (Millar, 1970).
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Berrill, N.J., 1950. The Tunicata with an account of the British species. London: Ray Society.
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Hayward, P.J. & Ryland, J.S. (ed.) 1995b. Handbook of the marine fauna of North-West Europe. Oxford: Oxford University Press.
Howson, C.M. & Picton, B.E., 1997. The species directory of the marine fauna and flora of the British Isles and surrounding seas. Belfast: Ulster Museum. [Ulster Museum publication, no. 276.]
JNCC (Joint Nature Conservation Committee), 1999. Marine Environment Resource Mapping And Information Database (MERMAID): Marine Nature Conservation Review Survey Database. [on-line] http://www.jncc.gov.uk/mermaid
Millar, R.H., 1970. British Ascidians London: Academic Press.[Synopses of the British Fauna, no. 1.]
Picton, B.E. & Costello, M.J., 1998. BioMar biotope viewer: a guide to marine habitats, fauna and flora of Britain and Ireland. [CD-ROM] Environmental Sciences Unit, Trinity College, Dublin.
Dorset Environmental Records Centre, 2018. Ross Coral Mapping Project - NBN South West Pilot Project Case Studies. Occurrence dataset:https://doi.org/10.15468/mnlzxc accessed via GBIF.org on 2018-09-25.
Fenwick, 2018. Aphotomarine. Occurrence dataset http://www.aphotomarine.com/index.html Accessed via NBNAtlas.org on 2018-10-01
NBN (National Biodiversity Network) Atlas. Available from: https://www.nbnatlas.org.
OBIS (Ocean Biodiversity Information System), 2023. Global map of species distribution using gridded data. Available from: Ocean Biogeographic Information System. www.iobis.org. Accessed: 2023-09-21
South East Wales Biodiversity Records Centre, 2018. SEWBReC Marine and other Aquatic Invertebrates (South East Wales). Occurrence dataset:https://doi.org/10.15468/zxy1n6 accessed via GBIF.org on 2018-10-02.
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Last Updated: 19/09/2006