Guardian Nature School Team Contact Blog Project Noah Facebook Project Noah Twitter

A global community of nature enthusiasts
photographing and learning about wildlife

Join Project Noah!
nature school apple icon

Project Noah Nature School visit nature school

Blue-grey Periwinkles

Austrolittorina unifasciata


These small sea 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. They were all over the place in small clusters, particularly around the calmer rock pools. This species is the only one of its genus found in Australia. I was really surprised to see how pitted and warn the shells were. An indication of age perhaps?


Ocean rock pools at North Avoca Beach. Beautifully crystal-clear seawater on the now receding tide.


Another possible contender as species ID is the Little Blue Periwinkle (Nodilittorina unifasciata) which is also common in these waters, but the photos I have seen of specimens of this species show them to be quite blue in appearance, hence the name. This spotting was definitely grey in appearance, with only the slightest hints of blue.

Species ID Suggestions

Sign in to suggest organism ID

No Comments

Neil Ross
Spotted by
Neil Ross

NSW, Australia

Spotted on Jul 27, 2013
Submitted on Aug 4, 2013

Noah Guardians
Noah Sponsors

Join the Project Noah Team Join Project Noah Team