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

(Quoy and Gaimard, 1827)

Umbrella hemispherical, about as wide as high or wider; jelly thick [M.rotunda-adult ]. Velum about 1/10 of bell radius.
Stomach short, with pyramidal apex attached to subumbrella along edges of cross-shaped furrow [M.rotunda-drawing ]. Mouth with slightly crenulated margins [M.rotunda-medusa ]. Radial canals four, issuing from stomach at ends of cross-shaped furrows. Ring canal narrow, widening opposite each marginal tentacle.
Gonads transversely folded along sides of cross-shaped furrow.
Marginal tentacles usually 16, up to 28(?32), hollow, smooth, with large conical basal bulbs. 1-3(4) spindle-shaped, hollow cordyli between adjacent marginal tentacles, with abundant nematocysts [M.rotunda-margin ]. No ocelli.

Diameter up to ca 22 mm.

Stomach, radial canals, gonads, and marginal tentacle bulbs carmine red to violet.

There is little information about the reproductive season: probably October-December (Edwards, 1973b).

Depth range
Medusa typically deep-sea oceanic.
— Hydroid recorded on variety of substrates, commonly colonial hydroids; coastal and across Continental Shelf, some deeper records to 681 m (Ramil and Vervoort, 1992a).

Distribution in the North Sea
Recorded from the North Sea (Kramp, 1947); probably common nowhere every year.

World distribution
Boreal to tropical parts of Atlantic and Indo-Pacific Oceans (Ramil and Vervoort, 1992a).
Medusa recorded in Atlantic Ocean from mid-Norway, Iceland and W Greenland south to Patagonia, W Africa and off Antarctic continent (Edwards, 1973b).
— Hydroid recorded in Atlantic Ocean from the same areas as medusa, but also north to Barents and Kara Seas (Naumov, 1969).

[Description after Cornelius, 1995a]

Modeeria rotunda