Pomacea vexillumPomacea vexillum is a South American species of freshwater snail with gills and an operculum, an aquatic gastropod mollusc in the family Ampullariidae, the apple snails.Taxonomic noteP. vexillum is considered a synonym of P. puncticulata by some authors.DistributionP. vexillum is known from Venezuela and Guyana.