Triacanthoidei

Triacanthidae, (from Ancient Greek τρι- (tri-), meaning "three", and ἄκανθα (ákantha), meaning "spine") known as the triplespines or tripodfishes, is a family of marine ray-finned fishes belonging to the order Tetraodontiformes, which also includes the pufferfishes, boxfishes, filefishes and related groups. The family is made up of four extant genera and three extinct genera which are known from fossils.

The spikefishes (family Triacanthodidae) are ray-finned fishes related to the pufferfishes and triggerfishes. They live in deep waters; more than 50 meters (165 feet), but above the continental shelves. They are found in the Atlantic, Indian Ocean, and the west-central Pacific.