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(a) Map of the study area (topography of the Monte Conca sinkhole (Adapted with permission from Madonia and Vattano [23]. 2008 Vattano). (b) Sulfidic habitat at the end of the lower gallery containing sulfur suspensions on water surface. (c) Filamentous microbial mats floating on the sulfide pool surface. (d) Acid droplets (snottites) hanging from the ceiling of the cave. Photos: F. Fiorenza.
