The common periwinkle or winkle, Littorina littorea, is a species of small edible sea snail, a marine gastropod mollusc that has gills and an operculum, and is classified within the family Littorinidae, the periwinkles. This is a robust intertidal species with a dark and sometimes banded shell. It is native to the rocky shores of the northeastern,...
Found on
http://en.wikipedia.org/wiki/Common_periwinkle
(from the article `periwinkle`) ...marks; a few are found on mud flats, and some tropical forms are found on the prop roots or mangrove trees. Of the approximately 80 species in the ... ...coasts, is a classic example: L. neritoides lives in crevices of exposed rocks above normal high water but releases floating (pelagic) egg ... [2 ...
Found on
http://www.britannica.com/eb/a-z/c/117
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