Sea tamarisk (Tamarisca tamarisca)
|Researched by||Emily Wilson||Refereed by||Admin|
|Other common names||-||Synonyms||-|
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 IrelandAll British and Irish coasts.
HabitatA circalittoral species normally found in moderate to strong tidal streams attached to bedrock or stable rocks or shells.
- 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.
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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.]
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Last Updated: 17/07/2002