Zethalia zelandica, common name the wheel shell, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails. Originally four names were proposed for this shell and published at about the same time—in 1854. G.W. Tryon stated that he had no means of knowing which has priority, but was inclined to prefer Hombron's to Adams', as it was accompanied by good figures. The title page of Philippi's monograph is 1853, but the actual date of issue is very uncertain.