Fig. 2

(a) High-resolution swath bathymetry map of the Basiluzzo Fe-rich hydrothermal field depicting the location of the diffuse ferruginous seep DFS2 (204 m), on which the specimen of S. oceana was collected, and of the site at 140 m where a patch of several specimens was identified and photographed by the ROV, small scale gullies (white arrows) are also reported; (b) picture of DFS2; (c) picture of the DFS portion sampled by the ROV basket net