Violet sea fan

Photo: Frédéric ANDRE · CC BY-NC

Paramuricea clavata is the most structurally important gorgonian in the Mediterranean, forming fans up to 1 m across on steep slopes below 20 m and providing habitat for colonies of commensal brittlestars, cryptic gobies, and the parasitic snail Neosimnia spelta. The species is a sentinel for thermal stress — mass mortality events during anomalous marine heatwaves have hit Paramuricea populations in the Ligurian Sea hard, and monitoring its health at Lindos provides early warning of warming impacts in the eastern Mediterranean. Slow-growing individuals may be 50 years old, meaning each fan represents decades of accumulated reef investment.