External morphology and polyps of Metallogorgia melanotrichos MBM286486 A the colony in situ. Laser dots spaced at 33 cm used for scale B, C the colony after collection D a branch under a light microscope E, F a single polyp under a light microscope G three polyps under SEM H head of one polyp under SEM I coenenchyme under SEM. Scale bars: 10 cm (B, C), 2 mm (D) and 500 μm (E–I; H, I at the same scale).