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Perdicella Helena (Newcomb, 1853) a species of land snails, tropical tree living endemic to Hawaii in the United States. Commonly called Perdicella Helena or Perdicella; Scientifc name is Achatinella helena Newcomb. Arboreal pulmonate gastropod mollusks in the family Achatinellidae, majority of the species are currently extinct. A Perdicella Helena's habitat type is Terrestrial.