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Dark Periwinkles

Afrolittorina acutispira

Description:

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.... https://www.projectnoah.org/spottings/19.... "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) https://seashellsofnsw.org.au/Littorinid...

Habitat:

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.

Notes:

https://www.marinespecies.org/aphia.php?...

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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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