Barnacles · Marine Life

Grey volcano barnacle (Tetraclita serrata)

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Close-up of a grey volcano barnacle. Mouille Point, Cape Town, Western Cape (2020) – iNaturalist

Tall, dark-grey and volcano-shaped, with only four strongly-ribbed shell plates, the edges of which are difficult to distinguish.

About 20 mm.

One of the dominant invertebrates in the mid-intertidal zone of moderately sheltered shores.

Two Oceans: A Guide to the Marine Life of Southern Africa (1994, 2016)
Grey volcano barnacles growing stuck to each other, covered with encrusting algae. Fishhoek, Western Cape (2020) – iNaturalist
Details of the ribbed shell plates on a grey volcano barnacle. Doringbaai, Western Cape (2020) – iNaturalist
Grey volcano barnacles on the rock surface form a habitat for many other species. Port St Johns, Wild Coast (2021).
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