A scrawled cowfish (Acanthostracion quadricornis), which is a relative of triggerfish and puffers.

(Blue Heron Bridge, Riviera Beach, FL)

fish; boxfish; scrawled cowfish; Chordata; sC Osteichthyes; Actinopterygii; sC Neopterygii; iC Teleostei; sO Acanthopterygii; Tetraodontiformes; subO Tetraodontoidei; Ostraciidae; subF Ostraciiinae; Acanthostracion quadricornis