Scientific Name:Littorina littorea
Phylum : Mollusca
Description: Coiled shell, operculum is usually present and corneous, rarely calcified. Its head has a pair of tentacles with basal eyes.
Distribution: Abundant intertidally, attached to any substratum.
Locomotion: Foot with pedal retractor muscles that are attached to the shell and dorsal mantle, and are used to raise, lower or shorten the foot.
Food gathering/digestion: Periwinkles are herbivores that browse on algal films. A scraping, file like ‘radula’ is located within the mouth. Periwinkles can also withstand long periods without food or water.
Gas Exchange: True gills locate under the shell.
Reproduction: The sexes are separated and male is with a penis. After internal fertilization, eggs are laid in capsules. Typical swimming trochophore and veliger larval stages exist.
Interesting Facts: They are sold in Italian fish markets; and are edible after light boiling in sea water.
Mercier Lab - Research on reproduction, larval development, ecology and growth is carried out on a wide variety of marine invertebrates in this lab.