|Modeeria rotunda (Quoy& Gaimard, 1827) (= Tiaranna rotunda)
Phylum Cnidaria / Class Hydrozoa / Order Leptomedusae / Family Tiarannidae
The most distinctive feature possessed by this uncommon hydromedusa are the deep red color of the central gonads, stomach and mouth lips. The bell is transparent, with a diameter up to 3 cm. The mouth has 4 large ruffled lips. Gonads lie in folds on the stomach wall and attach to the 4 radial canals. Up to 40 tentacles line the bell margin, with 1 to 3 spindle-like structures between each tentacle. Hydroids of Modeeria are known to live on other hydroid species to depths of 500 meters. The medusae have been collected in deep-water habitats of the North Atlantic, Mediterranean Sea, Pacific Ocean, and off Antarctica. In southern California it has been collected in the San Clemente Basin.
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