Solvin Zankl / Bioluminescent Sea-fireflies (Vargula hilgendorfii) producing a bright blue light. The light is produced by mixing two chemicals together in the presence of oxygen and is for mating displays or defenc...

Solvin Zankl / Bioluminescent Sea-fireflies (Vargula hilgendorfii) producing a bright blue light. The light is produced by mixing two chemicals together in the presence of oxygen and is for mating displays or defenc...

Solvin Zankl / Bioluminescent Sea-fireflies (Vargula hilgendorfii) producing a bright blue light. The light is produced by mixing two chemicals together in the presence of oxygen and is for mating displays or defenc...

Solvin Zankl / Photographer Solvin Zankl taking pictures of the Sea-fireflies (Vargula hilgendorfii) and Firefly squid (Watasenia scintillans) Japan, May 2017.

Solvin Zankl / Bioluminescent Sea-fireflies (Vargula hilgendorfii) washed up on shore, producing a bright blue light. The light is produced by mixing two chemicals together in the presence of oxygen and is for mati...

Solvin Zankl / Bioluminescent Sea-fireflies (Vargula hilgendorfii) washed up on shore, producing a bright blue light. The light is produced by mixing two chemicals together in the presence of oxygen and is for mati...

Solvin Zankl / Bioluminescent Sea-firefliy (Vargula hilgendorfii) producing a bright blue light. The light is produced by mixing two chemicals together in the presence of oxygen and is for mating displays or prey de...

SINCLAIR STAMMERS / Microscopic freshwater Ostracod crustacean (Cypris) in a freshwater sample from the River Teifi, Wales, UK. October.

Solvin Zankl / Ostracods / sea fireflies are little crustaceans living in the ocean. In the Caribbean coral reefs Ostracods use bioluminescent light for their mating display, like fireflies. Photographed for the fir...

Solvin Zankl / Ostracods are little Crustaceans living in the ocean. In the Caribbean coral reefs Ostracods use bioluminescent light on there mating display, like fireflies. That is why they are called sea fireflie...

Solvin Zankl / Ostracod (Gigantocypris muelleri) Atlantic Ocean off Cape Verde. Captive.

Jan Hamrsky / Seed shrimp (Ostracoda), freshwater crustacean swimming in the water column, Europe, December, controlled conditions.