Littorinidae

Family: Littorinidae

Group: Marine Invertebrate, Species

Scientific Name	Common Name	Summary
Littorina scutulata	Checkered periwinkle	This species lives so high in the intertidal that it breathes air and can drown if submerged for too long.
Littorina sitkana	Sitka periwinkle	Abundant snail in the upper intertidal of low-energy coastlines, especially on sunny rocks without much algal growth. Littorina sitkana is sometimes so numerous as to obscure the rocks it occupies in search of algae to eat. This is a small, round, dark species, lower and rounder than Checkered periwinkle (Littorina scutulata) which one is most often found in Fucus beds and on mussels.