Geographic Variation in the Yellow Mud Turtle, Kinosternon flavescens

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Abstract
Geographic and non-geographic morphological variation of 18 mensural characters of the shell and color is analyzed for populations of K. flavescens from throughout the range. K. f. arizonense and K. f. durangoense are morphologically divergent from K. f. flavescens and K. f. spooneri by all statistical tests employed. K. f. spooneri is indistinguishable from northern populations of K. f. flavescens and is placed in synonymy. K. f. durangoense and K. f. arizonense are slightly divergent from each other. The zoogeographic history of K. flavescens is discussed.