David Shale / Pram bug (Phronima) swimming, Mid-Atlantic Ridge. Deep sea species.

Solvin Zankl / Female Pram bug (Phronima sedentaria) with young in nest made from salp body, Atlantic Ocean off Cape Verde. Captive.

Solvin Zankl / Portrait of Sea butterfly / Thecosomata (Cuvierina spoeli) from Atlantic Ocean off Cape Verde. Controlled conditions.

Solvin Zankl / Deep sea amphipod (Cystisoma) swimming, a deep sea species from the Mesopelagic zone. Mid-Atlantic Ridge. Body is totally transparent and the redness in the eye is the visual pigment in the retina.

Solvin Zankl / Deep sea amphipod (Cystisoma) swimming, a deep sea species from the Mesopelagic zone. Mid-Atlantic Ridge. Body is totally transparent and the redness in the eye is the visual pigment in the retina.

Solvin Zankl / Deep sea amphipod (Cystisoma) swimming, a deep sea species from the Mesopelagic zone. Mid-Atlantic Ridge. Body is totally transparent and the redness in the eye is the visual pigment in the retina.

Solvin Zankl / Portrait of Horseshoe worm (Phoronis muelleri) larva swimming, Raunefjorden near Bergen, Norway.