Aquatic environments, mainly the sea.
Argyroneta aquatica because it is the only species of spider that lives entirely uder water
The planetary body that Spirit was designed to explore the wide ranges of soil and rocks for clues of the water activity on Mars. Spirit specifically landed at the Gusev Crater which was before, a possible lake in a giant crater.
Organisms with small, expandable bodies, extremely large mouths, and efficient teeth are likely to be found in the bathypelagic zone