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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.