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It's probably a hybrid of the blue salamanders as it does not mach any of the other species listed on the site. See notation regarding hybrids "Note: Across much of Lower Michigan, populations of Blue spotted Salamanders often include many hybrid individuals that may appear stouter and grayer, with fewer or no blue spots on the sides. Most hybrids are triploid females. (Normal salamanders are diploid, having two sets of chromosomes in their body cells; triploid salamanders have an extra set). Hybrid populations result from the breeding of Blue-spotted Salamanders with other members of the Ambystoma genus."