Can you spot the amphipod (Phronima atlantica) in the below photo? She's the transparent lobster-looking animal in the middle, surrounded by her own eggs -- inside a sac that once was the "barrel" of a salp. Mothers in the genus Phromina attack the barrel-shaped salps, hollowing out the inside of their sac body before laying their eggs inside. They use the barrel as an egg case to contain the eggs, and then hatched larva, so she can care for them in the open ocean.
This amphipod was photographed by researchers from the Census of Marine Zooplankton in the Sargasso Sea.
See more photos of cool zooplankton collected by the researchers in this zooplankton biodiversity slideshow.