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There are three pattern variations in this species: almost uniformly colored animals; animals with large dark spots with bright edges and animals with two dark brown longitudinal bands, one bright band along the back and two bright bands along the sides. The belly is whitish.
The body is stout with a flat head that is wider than it is long. The dorsal glands are arranged in longitudinal patterns along the back, or can be absent. The pupil is shaped like an upside-down droplet (Noellert and Noellert 1992).
D. galganoi is similar in appearance to D. jeanneae, but can be distinguished from the latter by biochemical and morphometric characteristics (Busack 1986). The distinction between D. jeanneae and D. galganoi is also supported by phylogenetic work based upon mitochondrial sequences (Garcia-Paris and Jockusch 1999).