In which habitat would you NOT expect to find Culex pipiens larvae?

Culex pipiens, commonly known as the common house mosquito, typically thrives in freshwater environments. The larvae of this species are commonly found in various habitats, including freshwater pools, urban areas with stagnant water, and swamps where there is abundant vegetation.

Salt marsh depressions are characterized by saline water and are not suitable habitats for Culex pipiens larvae. These larvae require freshwater for optimal development, as their physiological processes and survival are closely linked to freshwater ecosystems. In saltwater environments, the increased salinity would hinder growth and reproductive success, making these depressions uninhabitable for this particular species.

Thus, the correct answer highlights the habitat that does not support the life cycle of Culex pipiens, aligning with their ecological preferences and biological needs.