Tectarius antoniiTectarius antonii is a species of sea snail, a marine gastropod mollusc in the family Littorinidae, the winkles or periwinkles.DescriptionThe maximum recorded shell length is 21 mm.DistributionThis species occurs in the Gulf of Mexico, the Caribbean Sea and the Lesser Antilles.HabitatMinimum recorded depth is -2 m. Maximum recorded depth is 0 m.