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Genus: Diodon, Porcupinefishes


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nasal organ: flat tube with 2 holes
many large erectile spines

DIODON

PORCUPINEFISHES

Body robust, elongate, inflatable; head wide and blunt; eyes large; nasal organ a short flat tentacle with 2 openings; teeth fused into a strong, parrot-like beak with two plates that lack a front groove, large, opens widely at front; gill opening a vertical slit before pectoral base; pectorals large; fins without spines; no pelvic fins; body and head covered with numerous long (> eye), erectible, 2-rooted, slender, round spines, 12 to 20 or more spines between snout and dorsal fin.

A circumtropical genus with 7 species; 3 circumtropical species in our region.