Biodiversity & Conservation

General Information

A hydroid - Nemertesia ramosa - General information

Image Paul Newland - Nemertesia ramosa hydroid colonies at the Runnelstone, Cornwall Image width ca XX cm.
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Nemertesia ramosa recorded () and expected () distribution in Britain and Ireland (see below)

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Nemertesia ramosa is not listed under any importance categories.

General information

Researched by:	Angus Jackson	Refereed by:	Dr Rob Hughes

Taxonomy

Phylum	Cnidaria	Sea anemones, corals, sea firs & jellyfish
Class	Hydroidomedusa

Recorded distribution in Britain and Ireland	Widely distributed round all British and Irish coasts.
Habitat information	The colonies of this species live in small aggregations, usually with several colonies attached to a single 'main' stem. The colonies are typically attached to hard substrata such as bedrock, boulders, pebbles and shells. The hydroid attaches to the substratum using hydrorhizae which form a holdfast. The species lives in slight to moderately flowing water and is intolerant of wave action. Nemertesia ramosa has very similar habitat preferences to Nemertesia antennina
Description	Nemertesia ramosa is a colonial hydroid that lives in small aggregations. Individual colonies consist of an upright and irregularly branched stem up to about 15 cm in height. An individual may have several other colonies attached to the stem. The main stems bear whorls of fine side branches of even length and upwardly pointing, arranged in groups of 6. The hydroid is yellow/orange in colour and is usually more pigmented than the similar Nemertesia antennina.

This review can be cited as follows:

Angus Jackson 2004. Nemertesia ramosa. A hydroid. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 20/06/2013]. Available from: <http://www.marlin.ac.uk/speciesfullreview.php?speciesID=3864>

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