London, United Kingdom
Photograph - Photograph
Bubble alga (Ventricaria ventricosa) growing on coral. This single-celled, unattached, ball-shaped alga has a thin transparent membrane, which allows the alga to fill up with seawater. V. ventricosa can grow to between one and two centimetres and is found at depths of up to 80 metres. It exists either as a solitary cell or in dense colonies. Other names that this alga is known by include sea pearl and sailor's eyeball.
May 7th, 2013
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