External morphology and polyps of Metallogorgia macrospina MBM286489 A the colony in situ. Laser dots spaced at 33 cm used for scale B the colony after collection C a branch under a light microscope D a terminal branchlet 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), 2 mm (C), and 500 μm (D–I; H, I at the same scale).