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
Links to other Web sites

Dujardin, 1843

Description
Umbrella bell-shaped, slightly higher than wide [Cladonema radiatum ]; jelly moderately thin, sometimes a slight apical projection present; velum very broad. Usually eight, sometimes ten, radial canals corresponding with an equal number of marginal tentacles.
Manubrium spindle-shaped [C.radiatum-medusa ], not extending beyond umbrella margin, its middle region usually with five, sometimes four, perradial pouches; mouth with a similar number of short lips armed with nematocyst clusters.
Gonads completely surrounding apical 2/3 of manubrium. Marginal tentacles branched, branches beset with numerous nematocyst clusters [C.radiatum-adult ]; tentacular bases elongate and thickened; one to four, usually three, organs of adhesion on each tentacular base. Tentacular bulbs each with an abaxial ocellus.
Young stages: C.radiatum-newly, C.radiatum-young subumbrellar.

Size
Umbrella up to 4 mm high.

Colour
Manubrium and marginal tentacles red, bright red or brown; ocelli black or deep crimson.

Ecology and depth range
This medusa can creep or swim [C.radiatum-creeping ]. Seasonal occurrence is little known.

Distribution in the North Sea
Throughout the North Sea.

World distribution
N Atlantic Ocean including Mediterranean Sea and Black Sea; NW Pacific Ocean.

[After Russell, 1953a; Russell, 1977a; Kramp, 1959]

Cladonema radiatum