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Dark Periwinkles

Afrolittorina acutispira


Thanks to the Australian Museum in Sydney, I've been able to identify this spotting. These are dark periwinkles, a native species of mollusc that's endemic to this area. Size up to 7 mm in length, but commonly 2-3 mm. This spotting shows them in juvenile form, and they are tiny! Mass aggregations like this are to conserve moisture, seen here with Austrolittorina unifasciata, aka little blue periwinkles.... "The colour is variable from dark brown to pale fawn, and from unpatterned to strongly marked. The colour is usually dark brown in the early whorls - hence juvenile shells are dark brown - changing to fawn or light brown on the latter whorls. Shells may be translucent, particularly the lighter coloured specimens." (Seashells of NSW)


This spotting was in the intertidal zone of the rock platform below Broken Head, near The Haven at Terrigal Beach on the NSW Central Coast.


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Neil Ross
Spotted by
Neil Ross

Terrigal, New South Wales, Australia

Spotted on Dec 20, 2021
Submitted on Jan 21, 2022

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