Littoraria angulifera (Lamarck, 1822) Mangrove Periwinkle

    On concrete piling of U. S. Government dock in St. Johns River, Ft. Caroline National Memorial, Jacksonville, Duval Co., Florida 10/22/2007 (about 20 mm.). The species shares this habitat with the abundant species Littoraria irrorata (Say, 1822) Marsh Periwinkle.