Parazoanthus axinellae, commonly known as the yellow cluster anemone, is a species of zoanthid coral in the family Parazoanthidae. It is found on rocky substrates around the southern Atlantic coasts of Europe and in the Mediterranean Sea, at depths between 23 and 45 metres (75 and 148 ft). Zoanthids differ from true sea anemones in having a different internal anatomy and in forming true colonies in which the individual animals (polyps) are connected by a common tissue, called the coenenchyme. Parazoanthus axinellae is yellow or orange in colour, each polyp featuring 24 to 36 tentacles and having a diameter of 5 millimetres (0.20 in) with a height of 20 millimetres (0.79 in). In the Mediterranean Sea, it frequently forms dense agglomerations, often in association with the soft coral Alcyonium acaule. This P. axinellae cluster was photographed in Arrábida Natural Park, Portugal.Photograph credit: Diego Delso
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