At least four species of periwinkle occur regularly in the Baltic Sea. And, in fact, these creatures’ Latin name Littorinidae comes from the Baltic’s old geological name “Littorina Sea”.
The young ones can be found in thick algae and seagrass beds where they play an important cleaning role. Grazing microscopic algae off underwater plants means photosynthesis can occur unhindered.
Baltic Sea LIFE - DISCOVER.UNDERSTAND.PROTECT.