Scanning electron micrograph (SEM) of diatom with thermophilic bacteria. Collected from 140 degree F water in the springs of Yellowstone National Park, Wyoming USA. This type of bacteria is adapted to thrive at high water temperatures and is currently the focus of biological researchers. Bacteria that can live in these extreme conditions are called thermophiles or extremophiles. Typically, the hotter the temperature the smaller the bacteria. Shot at 4,580X magnification with a field of view of 27 um.