Distinctive Characters: Dorsal fin with 9-10 (usually 9) rays. Anal fin with 9-10 (usually 9) rays. Pectoral fin with 16-18 (usually 17) rays.
Colour: Brown orange with close set pale blue-green spots on head and body and blue-green lines radiating from eyes. A dark ocellus sometimes present at base of dorsal fin. Fins largely unmarked.
Habitat and Biology: Usually found in caves. A cryptic species.
Remarks: Canthigaster janthinoptera is closely related to the Hawaiian endemic C. jactator (Jenkins) and the Tropical Eastern Pacific species, C. punctatissima (Günther). These small pufferfishes (or tobies) enjoy some freedom from predation as a result of their repelling skin toxin.