MarLIN

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

Thumbnail crab (Thia scutellata)

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

Summary

Description

A small, flat crab with a heart shaped carapace, up to 20 mm long, distinctly notched around the edge with a dense fringe of long hairs. Pale pink in colour with red to brown markings.

Recorded distribution in Britain and Ireland

Has been recorded at Moray Firth, Plymouth, Channel Isles, Scilly Isles, Carmarthen Bay, Cardigan Bay, Anglesey, Liverpool Bay, Isle of Man and Galway Bay.

Global distribution

-

Habitat

Burrows in sand and mud from low water to about 45 m.

Depth range

-

Identifying features

  • Carapace slightly brader than long, strongly convex transversely, dorsal surface smooth, margins densely setose.
  • Frontal region arched, orbits and eyes very small.
  • Antero-lateral margins of carapace with three or four indistinct teeth.
  • Chelipeds equal, slightly compressed.

Additional information

Also commonly known as the polished crab.

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

  3. 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.]

  4. Ingle, R.W., 1980. British Crabs. Oxford: British Museum (Natural History), Oxford University Press.

  5. 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

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

  7. 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., http://www.itsligo.ie/biomar/

Citation

This review can be cited as:

Wilson, E. 2008. Thia scutellata Thumbnail crab. 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/1234

Last Updated: 13/05/2008