Unlike puffers and porcupine fish, boxfish have a hard shelled bony shield with holes for the fins and slits for gills. Boxfish tend to be fatter than a leatherjacket, but thinner than a pufferfish or porcupine fish.
Pictured here is a white barred boxfish Anoplocapros Lenticularis which sometimes gets the nickname “Humpty Dumpty” due to its deep body and round humpbacked appearance. Adult males are yellowish-orange to brownish-orange or reddish with broad pale grey to whitish bands on the side. Females are similar, but paler with additional black irregular lines and spots on the dorsal half of body. Small juveniles are somewhat similar to females, but with more spots.