This data set contains four .tps files, each containing geometric morphometrics landmark data for snail shells collected from a separate island. There is also one file (CZdata.csv) containing the relevant biological characteristics for each of these snails. Missing shell thickness data is a result of incomplete recording of this trait. The file ShapeParameters.csv contains the growth based shape parameters inferred from the landmark data, as presented in a paper currently in review, which will be linked to here if accepted.