Animal Species:Little Blue Periwinkle

These tiny blue snails are about the size of your little fingernail and are the most abundant molluscs on the rocky shore, generally found toward the high-tide mark.

Little Blue Periwinkle in a line on rock

Andrew Donnelly © Australian Museum

Standard Common Name

Little Blue Periwinkle

Identification

The name of this snail comes from its small size and the pale blue colour of its shell.

Size range

1.6 cm

Distribution

Little Blue Periwinkles are found in Southern Queensland, New South Wales, Victoria, South Australia, Western Australia and Tasmania.

Habitat

Little Blue Periwinkles live in intertidal rock pools.

Feeding and Diet

During high tide they rove around the rock platform, scraping algae and lichens from the rock with their strong radula. They travel up to 12 m in search of food, which is quite a feat for an animal that is only 15 mm long.

Other behaviours and adaptations

Little Blue Periwinkles live in clusters of thousands, which helps prevent moisture loss.

Classification

Species:
unifasciata
Genus:
Nodilittorina
Family:
Littorinidae
Order:
Sorbeoconcha
Class:
Gastropoda
Phylum:
Mollusca
Kingdom:
Animalia

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Tags gastropods, snails, molluscs, invertebrates, identification, wildlife of sydney,