This week’s challenge calls for some close-ups, and I immediately thought of this shot. Meet phyllorhiza punctata, more easily pronounced as a white-spotted jellyfish. According to the display, “These jellies can grow up to 60 cm (24 in) in diameter. The stinging cells in their tentacles capture food and provide protection. Each large jelly can collect food from 50 m³ (65 cu yd) of water a day. Diet: small zooplankton. Distribution: coastal areas and estuaries in the Southwestern Pacific, invasive in Hawaii and the Gulf of Mexico.” I photographed this little one, however, at the aquarium at the California Academy of Sciences in San Francisco.