Drupella snails are a small mucirid gastropod found throughout the indo-pacific ocean which feeds on living coral tissue (coralivore). There is a lack of information or descriptions of these snail species prior to 1982, but subsequently they have been found in large aggregations or outbreak populations in areas such as Kenya, Australia, Hong Kong, the Red Sea, and the Gulf of Thailand.
These outbreaks, or overpopulations, have led to dramatic loss in living coral tissue, reduced reef resilience and recovery, population regime shifts, and possibly increased disease occurrence. The outbreaks occur due to more of the larvae and juveniles surviving, just like the case of Crown of Thorns Starfish. one female can produce over 100,000 eggs, which will turn into free-swimming larvae. Most of these larvae should not survive, they should be eaten by fish and plankton feeders (including the corals themselves!) or starve to death in the clean waters of the ocean. When the fish are removed due to over fishing, or the water quality decreases due to nutrient inputs, then more larvae survive to adulthood. Once the become adults they have very few natural predators, as they are a very unattractive food source.