MarLIN

information on the biology of species and the ecology of habitats found around the coasts and seas of the British Isles

A sea slug (Adalaria proxima)

Distribution data supplied by the Ocean Biogeographic Information System (OBIS). To interrogate UK data visit the NBN Atlas.

Summary

Description

Adalaria proxima is a substantial sea slug with a broad yellow body covered in fleshy projections (tubercles). Near the rear end is a circle of feathery gills and near the front end are antenna-like rhinophores that have a ribbed or stacked-plate like appearance (lamellate).

Recorded distribution in Britain and Ireland

A northern species in Britain, with it southern limit in north Wales.

Global distribution

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Habitat

Adalaria proxima feeds on sea mats (bryozoans) that encrust seaweed and is found in the intertidal and shallow sublittoral, mostly on Electra pilosa but also on species of Membranipora, Alcyonidium and Flustrellidra.

Depth range

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Identifying features

  • An oval shaped sea slug up to 17 mm long.
  • Most individuals yellow all over but may be white in northern Britain.
  • Body is covered in small club shaped tubercles, with pointed tips.
  • Twelve gills surrounding anal papilla.
  • Rhinophores lamellate.

Additional information

Adalaria proxima may be confused with Onchidoris muricata but Adalaria proxima has a deeper colour and the rhinophores (tentacles at the front end longer than the tubercles) are more blunt at the tip.

Listed by

- none -

Further information sources

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Bibliography

  1. Hayward, P., Nelson-Smith, T. & Shields, C. 1996. Collins pocket guide. Sea shore of Britain and northern Europe. London: HarperCollins.

  2. 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.]

  3. National Biodiversity Network (NBN) Atlas website. Available from: http://www.nbnatlas.org.  Accessed 01 April 2017

  4. Picton, B. E. & Morrow, C.C., 1994. A Field Guide to the Nudibranchs of the British Isles. London: Immel Publishing Ltd.

  5. Thompson, T. E. & Brown, G. H., 1976. British Opisthobranch Molluscs. London: Academic Press. [Synopses of the British Fauna, no. 8.]

Citation

This review can be cited as:

Neal, K.J. 2007. Adalaria proxima A sea slug. In Tyler-Walters H. and Hiscock K. (eds) Marine Life Information Network: Biology and Sensitivity Key Information Reviews, [on-line]. Plymouth: Marine Biological Association of the United Kingdom. Available from: http://www.marlin.ac.uk/species/detail/2044

Last Updated: 04/06/2007