
The One-tooth Simnia
One-tooth Simnias, Simnialena uniplicata (G. B. Sowerby II, 1849), are elongated marine gastropods that may reach 20 mm (about 4/5 inch). They live exclusively on the “branches” of Sea Whips, which are colonial organisms related to corals. One-tooth Simnias feed on the mucus of and materials entrapped by Sea Whips, apparently without damaging the Sea-whip polyps. They spend most of their lives on the hosts (except for the time they spend in the plankton as larvae), and may be yellow, white, red