Tectarius antonii is a species of sea snail, a marine gastropod mollusc in the family Littorinidae, the winkles or periwinkles. Description The maximum recorded shell length is 21 mm. Distribution This species occurs in the Gulf of Mexico, the Caribbean Sea and the Lesser Antilles. Habitat Minimum recorded depth is -2 m. Maximum recorded depth is 0 m. References Reid, D.G. (1989) The comparative morphology, phylogeny and evolution of the gastropod family Littorinidae. Philosophical Transactions of the Royal Society of London, Series B 324: 1–110. Rosenberg, G., F. Moretzsohn, and E. F. García. 2009. Gastropoda (Mollusca) of the Gulf of Mexico, Pp. 579–699 in Felder, D.L. and D.K. Camp (eds.), Gulf of Mexico–Origins, Waters, and Biota. Biodiversity. Texas A&M Press, College Station, Texas Littorinidae Gastropods described in 1846