Boxfishes
Spotted Boxfish
Ostracion meleagris
(1: Lighthouse, Lanai / 2-3: Coral Galleries, Kauai / 4: Tortugas, Kauai / 5: Mala Pier, Maui / 6: Harbor Ledges, Kauai / 7: Hale O Honu, Kauai / 8: Dog Beach, Kona)
Females are black with white spots. Males are a brilliant blue on the side, with orange highlights.
Thornback CowfishLactoria fornasini
(1-3: Moray Eel Cove, Kona)
Whitley's Boxfish
Ostracion whitleyi
   (1: Lighthouse, Lanai / 2: Kaloko Arches, Kona / 3: First Cathedral, Lanai)
Porcupinefishes
Giant Porcupinefish
Diodon hystrix
(1: Tortugas, Kauai / 2: Secret Wreck, Oahu / 3: Mario World, Oahu / 4: Turtle Craters, Oahu / 5: Second Cathedral, Lanai / 6: First Cathedral, Lanai / 7: Hale O Honu, Kauai / 8: Sheraton, Kona)
Usually solitary, but I saw a big school of them off Oahu:
Longspine PorcupinefishDiodon holocanthus
(1-2: Tortugas, Kauai / 3: Paradise Pinnacle, Kona)
Pufferfishes
Ambon Toby
Canthigaster amboinensis
(1: Two Step, Kona / 2: Kahalu'u Beach Park, Kona / 3: No Name, Lanai / 4: Kua Bay, Kona)
Crowned Toby
Canthigaster coronata
(1: Kaloko Arches, Kona / 2: Sheraton Caverns, Kauai / 3: Harbor Ledges, Kauai / 4: Mario World, Oahu / 5-6: Hale O Honu, Kauai)
Hawaiian Whitespotted Toby
Canthigaster jactator
(1: Reef's End, Molokini / 2: Pawai, Kona / 3-4,7: Kahalu'u Beach Park, Kona / 5: Kua Bay, Kona / 6: Sheraton Caverns, Kauai / 8: Turtle Canyons, Oahu)
Distinguishable from a female spotted boxfish due to its longer snout, and spots which do not extend onto the tail.
The spots gain a blue tint at night:
A number of the ones I saw in Kauai had black patches on them:
Lantern Toby
Canthegaster epilampra
(1-2: Kaloko Arches, Kona / 3-5: Fast Lanes, Kauai / 6-7: Barge Harbor North, Lanai / 8: Amber's Arches, Kauai)
Spotted PufferArothron meleagris
(1: Two Step, Kona / 2: Kahalu'u Beach Park, Kona / 3: First Cathedral, Lanai / 4-5: No Name, Lanai)
This one got startled and puffed up:
Stripebelly Puffer
Arothron hispidus
(1,2: The Dome, Kona / 3-4: Mile Marker 4, Kona)
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