The Marsh Dalek was a variation on the standard Dalek model.
Employed to patrol swamps, the Marsh Daleks were structurally different from the standard model. They looked like cans balanced on thin stilt legs. They lacked the usual manipulator arm, and had a gunstick positioned in the centre of its cylindrical body.
Marsh Daleks on Gurnian were responsible for keeping the local wildlife under control, but the creatures of Gurnian proved to be a match for the Daleks. At least one Marsh Dalek had fallen prey to a horrorkon. (COMIC: Monsters of Gurnian)