David Hall / Blackfoot firefish (Parapterois heterurus), blue stripes on pectoral fin when threatened, on gravel. Pantar, Alor Archipelago, Indonesia.

David Hall / Blackfoot firefish (Parapterois heterura), blue striped pectoral fins displayed as a response to threat. Pantar Island, Alor Archipelago, Indonesia.

David Hall / Blackfoot firefish (Parapterois hetururus) on gravel. Pantar, Alor Archipelago, Indonesia.

David Fleetham / Rare deep water Gurnard lionfish (Parapterois heterura), Anilao, Philippines.

Alex Mustard / Portrait of a gurnard lionfish (Parapterois heterura) on the seabed. Anilao, Batangas, Luzon, Philippines. Verde Island Passages, Tropical West Pacific Ocean.

Tim Laman / Gurnard Lionfish (Parapterois heterura) on a sandy seabed, Bali, Indonesia.

David Fleetham / Blackfin lionfish (Parapterois heterura) swimming along the seafloor, Anilao, Philippines. The lionfish sometimes partly buries itself in sand or mud and has fan-like, non-filamentous pectoral fins as...

Alex Mustard / Portrait of a Gurnard lionfish (Papaterois hetururus) on the seabed. Anilao, Batangas marine protected area, Luzon, Philippines. Verde Island Passages, Tropical West Pacific Ocean.