Lactophrys is a genus of marine ray-finned fishes belonging to the family Ostraciidae, the boxfishes.

[1] O. trigonus has been first formally described by Carl Linnaeus in the 10th edition of Systema Naturae published in 1758, the type locality was mistakenly given as India when it is actually the Western Atlantic.

[2] The 5th edition of Fishes of the World classifies this genus within the family Ostraciidae in the suborder Ostracioidea within the order Tetraodontiformes.

They have small mouths located at the front of the snout, with fleshy lips and a row of no more than 15 moderately sized conivcal teeth in each jaw.

[7] The largest species in the genus is the buffalo trunkfish (L. trigonus) with a maximum published total length of 55 cm (22 in).