The Mississippi map turtle (Graptemys pseudogeographica kohni) is a subspecies of land and water turtle belonging to the family Emydidae. G. p. kohni is endemic to the central United States. Etymology The Mississippi map turtle derives its common name not from the state of Mississippi, but rather from the Mississippi River. The specific name, kohni, is in honor of amateur naturalist Joseph Gustave Kohn (1837–1906) of New Orleans, Louisiana, who collected the type specimen. Geographic range Graptemys pseudogeographica kohni is found along the Mississippi River and its tributaries, from Illinois and Missouri southward. Description Their grey shells are covered in yellow lines resembling contour lines. Captivity The Mississippi map turtle is a popular pet for aquarists and is very enjoyable to watch. References Further reading Conant R (1975). A Field Guide to Reptiles and Amphibians of Eastern and Central North America, Second Edition. Boston: Houghton Mifflin. xviii + 429 pp. + 48 plates. (hardback), (paperback). (Graptemys kohni, pp. 56–57 + Plates 5, 8 + Map 19). Powell R, Conant R, Collins JT (2016). Peterson Field Guide to Reptiles and Amphibians of Eastern and Central North America, Fourth Edition. Boston and New York: Houghton Mifflin Harcourt. xiv + 494 pp., 47 Plates, 207 Figures. . (Graptemys pseudogeographica kohnii, pp. 208–209, Figure 93 + Plates 16, 21). Smith HM; Brodie ED Jr (1982). Reptiles of North America: A Guide to Field Identification. New York: Golden Press. 240 pp. (paperback). (Graptemys pseudogeographica kohni, pp. 50–51.) Graptemys Turtles of North America Reptiles of the United States Reptiles described in 1890 Taxa named by Georg Baur