Alex Mustard / Portrait of a Giant frogfish (Antennarius commersoni) on a large Yellow elephant ear sponge (Ianthella basta). Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Portrait of a Giant frogfish (Antennarius commersoni) on a large Yellow elephant ear sponge (Ianthella basta) on a coral reef. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Franco Banfi / Elephant ear sponge (Ianthella basta) with a scuba diver swimming in he background, Gorgonia Wall Reef, Cabilao Island, Bohol, Central Visayas, Philippines, Pacific Ocean.

David Fleetham / Yellow elephant ear sponge (Ianthella basta) with dark-coloured Whiteline sea cucumbers (Synaptula lamperti) and the paler, unnamed species, Philippines.

Alex Mustard / A reef scene with an orange elephant ear sponge (Ianthella basta) and red sea whip (Ellisella sp) with schooling silversides fish above. Pelee Island, Misool, Raja Ampat, West Papua, Indonesia. Ceram...

Alex Mustard / Coral reef scene, with Philippines chromis (Chromis scotochiloptera), hard coral (Acropora sp.) and purple elephant ear sponges (Ianthella basta). Apo Island Marine Protected Area, Dumaguete, Negros,...