Home|Search|Identify|Taxonomic tree|Quiz|About this site|Feedback
Developed by ETI BioInformatics
Characteristics, distribution and ecology
Taxonomische classification
Synonyms and common names
Literature references
Images, audio and video
Distribution map
Links to other Web sites

(Allman, 1863)

Description
Umbrella semi-globular [Bougainvillia muscus ]; mesogloea very thick, especially in apical region; velum narrow. The four radial canals and circular canal narrow. With short and broad manubrium, sometimes slightly pedunculate. Mouth simple, circular; perradial oral tentacles inserted distinctly above mouth rim, branching dichotomously 1-2 (rarely 3-6) times, and armed with terminal nematocyst clusters.
Four interradial gonads reaching perradii, globular in females, prolonged in males [B.muscus-male].
Four small, oval marginal tentacular bulbs each with a group of 4-9 (usually 3-5) long and solid tentacles of one kind; bulbs with black, round adaxial ocelli at the base of each tentacle.
Young specimens: B.muscus-young-habitus .
Size
Umbrella 2-4 mm high and wide.

Colour
Manubrium and marginal tentacle bulbs dark reddish brown, crimson or yellowish, sometimes with greenish tinge [B.muscus-male-habitus ].

Ecology and depth range
Meropelagic; neritic. Hydroids produce medusae during spring, summer and autumn and medusae may be encountered a late as December.

Distribution in the North Sea
Throughout whole North Sea.

World distribution
North Atlantic Ocean including Mediterranean Sea; Arctic Ocean; E and W South Atlantic and Indo-Pacific Oceans.

[After Russell, 1953a; Kramp, 1959; Bouillon, 1999]

Bougainvillia muscus