Tetrakentron synaptae living on the holothurian Leptosynapta
galliennei; and deep-sea benthic habitats such as manganese
nodules (for example, Angursa capsula). Marine habitats are
relatively stable environments but the limno-terrestrial environment
can experiences great changes in light, humidity, and
temperature on a seasonal or even diurnal timescale, which tardigrades
must be able to survive.