Trochus squarrosus is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails. The height of an adult shell attains 35 mm, its diameter 40 mm. The thick, umbilicate shell has a conic-pyramidal shape. It is radiate with white and and rose color. it contains 9 whorls, the embryonic smooth, the following planulate. ...