Alex Mustard / A male pajama cardinalfish (Sphaeramia nematoptera) incubating eggs in his mouth (not clearly visible). Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Georgette Douwma / Pajama cardinalfish (Sphaeramia nematoptera) Indonesia.

Georgette Douwma / Pajama cardinalfish (Sphaeramia nematoptera) West Papua, Indonesia

Georgette Douwma / Pajama cardinalfish (Sphaeramia nematoptera) Lembeh Strait, Sulawesi, Indonesia.

Claudio Contreras / Pajama Cardinalfish (Sphaeramia nematoptera), Inanuran Island, Danajon Bank, Central Visayas, Philippines, April

Claudio Contreras / Pajama Cardinalfish (Sphaeramia nematoptera), Inanuran Island, Danajon Bank, Central Visayas, Philippines, April

Claudio Contreras / Pajama Cardinalfish (Sphaeramia nematoptera), Inanuran Island, Danajon Bank, Central Visayas, Philippines, April

Michele Westmorland / Pajama Cardinalfish (Sphaeramia nematoptera), Palau, Micronesia.

Fred Bavendam / Pajama Cardinalfish (Sphaeramia nematoptera), Lembeh Strait, Indonesia

Doug Perrine / Pajama / Polkadot cardinalfish {Sphaeramia nematoptera} captive

David Fleetham / Pajama cardinalfish (Sphaeramia nematoptera), Palau, Micronesia.

Joel Sartore / Photo Ark / Pajama cardinalfish (Sphaeramia nematoptera) portrait, Omaha's Henry Doorly Zoo and Aquarium. Captive, occurs in Western Pacific Ocean.