MarLIN

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

A hydroid (Tamarisca tamarisca)

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

Summary

Description

A colonial hydroid that grows up to 15 cm or more. It is straggly in appearance with alternate branches, widely spaced along the stem. The hydrothecae, a supporting, nonliving, protein-chitinous envelope surrounding the stem, is large, up to 1.6 mm long, tubular and variously outward curving. It is easily mistaken for a sparsely branched form of Abietinaria abietina but is distinguished by opposite hydrothecae.

Recorded distribution in Britain and Ireland

All British and Irish coasts.

Global distribution

-

Habitat

A circalittoral species normally found in moderate to strong tidal streams attached to bedrock or stable rocks or shells.

Depth range

-

Identifying features

  • Colony 15 cm or more, straggly; monosiphonic throughout; branches alternate, widely spaced.
  • Male gonotheca kite-shaped, flattened, tapering to short pedicel below.
  • Female gonotheca conical, distal end hidden by two large, ragged flaps cut into several fingers.

Additional information

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Bibliography

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

  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.]

Citation

This review can be cited as:

Wilson, E. 2002. Tamarisca tamarisca A hydroid. 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/1264

Last Updated: 17/07/2002