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Euglandina rosea , not presently found at Ranomafana , has been included because it may be found in the region in the future . This represents the user 's interpretation of locality without loss of information . It is a process that is quite laborious , requiring the interpretation of antiquated and often imprecise textual locality descriptions into Cartesian coordinates such as latitude and longitude . It works by allowing the user to select a locality record , quickly locate the referenced place on a base map , and to draw a shape that represents the user 's interpretation of the locality . One such intentional introduction is the carnivorous snail Euglandina rosea from Florida to control the Giant African Snail Achatina fulica . apr ) , including filename , projection , datum , and reference themes , will be identified by a session number and stored as an XML document in a separate table . The effect on Achatina has been slight because E. rosea prefers to feed on smaller native snails . I think that this is an artifact of poor collecting in this area , and it is likely that the relationship between the western African and eastern African montane arthropod faunas includes a west Africa-southern Congo highland component .