A pea urchin (Echinocyamus pusillus)

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

Summary

Description

The pea urchin reaches 1 cm in diamter and is normally whitish brown or yellow but will turn green when damaged or preserved. Unlike many other urchin species the mouth and anus are on the underside and the ambulacral area and tube feet are confined to the upper surface in a petal shaped pattern. The flattened oval body is covered in short spines.

Recorded distribution in Britain and Ireland

Found off all British and Irish coasts.

Global distribution

-

Habitat

Found buried in coarse sand or gravel from extreme low water to 1250 m. Echinocyamus pusillus feeds on detritus, foraminferans and algae.

Depth range

-

Identifying features

  • Body oval, flattened with short spines.
  • Anus on underside, behind the mouth.
  • Ambulacral plates on upperside.
  • Each ambulcral plate with six to nine pairs of tube feet.
  • Aristotle's lantern with well developed teeth.

Additional information

No text entered

Listed by

- none -

Further information sources

Search on:

Bibliography

  1. Bruce, J.R., Colman, J.S. & Jones, N.S., 1963. Marine fauna of the Isle of Man. Liverpool: Liverpool University Press.

  2. Gage, J., 1972. A preliminary survey of the benthic macrofauna and sediments in Lochs Etive and Creran, sea-lochs along the west coast of Scotland. Journal of the Marine Biological Association of the United Kingdom, 52, 237-276.

  3. Ghiold, J 1982. Observations on the clypeasteroid Echinocyamus pusillus (O. F. Müller). Journal of Experimental Marine Biology and Ecology, 61(1), 57-74 DOI: https://doi.org/10.1016/0022-0981(82)90021-1

  4. Hayward, P.J. & Ryland, J.S. (ed.) 1995b. Handbook of the marine fauna of North-West Europe. Oxford: Oxford University Press.

  5. 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.]

  6. Mortensen, T.H., 1927. Handbook of the echinoderms of the British Isles. London: Humphrey Milford, Oxford University Press.

  7. Nichols, D., 1969. Echinoderms (4th ed.). London: Hutchinson & Co.

  8. Picton, B.E., 1993. A field guide to the shallow-water echinoderms of the British Isles. London: Immel Publishing Ltd.

  9. Southward, E.C. & Campbell, A.C., 2006. Echinoderms. The Linnean Society of London. Avon: The Bath Press. [Synopses of the British Fauna No. 56.]

  10. WoRMS 2007. The World Register of Marine Species (WoRMS). http://www.marinespecies.org, 2008-10-31

Datasets

  1. Centre for Environmental Data and Recording, 2018. Ulster Museum Marine Surveys of Northern Ireland Coastal Waters. Occurrence dataset https://www.nmni.com/CEDaR/CEDaR-Centre-for-Environmental-Data-and-Recording.aspx accessed via NBNAtlas.org on 2018-09-25.

  2. Environmental Records Information Centre North East, 2018. ERIC NE Combined dataset to 2017. Occurrence dataset: http://www.ericnortheast.org.ukl accessed via NBNAtlas.org on 2018-09-38

  3. Fenwick, 2018. Aphotomarine. Occurrence dataset http://www.aphotomarine.com/index.html Accessed via NBNAtlas.org on 2018-10-01

  4. Kent Wildlife Trust, 2018. Kent Wildlife Trust Shoresearch Intertidal Survey 2004 onwards. Occurrence dataset: https://www.kentwildlifetrust.org.uk/ accessed via NBNAtlas.org on 2018-10-01.

  5. Manx Biological Recording Partnership, 2022. Isle of Man historical wildlife records 1990 to 1994. Occurrence dataset:https://doi.org/10.15468/aru16v accessed via GBIF.org on 2024-09-27.

  6. NBN (National Biodiversity Network) Atlas. Available from: https://www.nbnatlas.org.

  7. OBIS (Ocean Biodiversity Information System),  2025. Global map of species distribution using gridded data. Available from: Ocean Biogeographic Information System. www.iobis.org. Accessed: 2025-05-02

  8. South East Wales Biodiversity Records Centre, 2023. SEWBReC Marine and other Aquatic Invertebrates (South East Wales). Occurrence dataset:https://doi.org/10.15468/zxy1n6 accessed via GBIF.org on 2024-09-27.

Citation

This review can be cited as:

Lumbis, R. 2008. Echinocyamus pusillus A pea urchin. In Tyler-Walters H. and Hiscock K. Marine Life Information Network: Biology and Sensitivity Key Information Reviews, [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 02-05-2025]. Available from: https://www.marlin.ac.uk/species/detail/47

Last Updated: 26/03/2008