shells of the gastro mollusk rapana on the shore in the storm surges of the black sea near sozopol

beach benthos bentos black sea coast cochlea color conch disbalance ecocatastrophe ecology exotic gastropod gastropoda hard invader invasia invasion invasive species life marine invasions mollusc mollusca mollusk nature predatory rapana venosa sand seashell shell shellfish ship shipping snail solid spiral stone stones thomasiana undersea veined whelk vessel wildlife