There are currently fourteen recognized species and two valid subspecies of map turtles. Graptemys (map turtles) are the most diverse Genus of turtles in the United States. They are primarily a riverine species that can exist sympatrically (with other Graptemys species) or allopatrically (as the sole Graptemys species) in a river drainage or drainages. Some species are endemic to a single river system or a few river systems, others are wide-ranging species existing in many river systems. Most sympatric populations of map turtles consist of each species (females only) having different head types (megacephaly-wide, mesocephaly-medium, microcephaly- narrow) to alleviate competition of food resources.
Map Turtle Breakdown
Megacephalics (wide-heads, molluscivorous diet), 5
Barbour’s map turtle (G. barbouri)
Escambia map turtle (G. ernsti)
Pascagoula map turtle (G. gibbonsi)
Pearl River map turtle (G. pearlensis)
Alabama map turtle (G. pulchra)
Mesocephalics (medium heads, but variable depending on diet and location),4
Cagle’s map turtle (G. caglei)
Northern map turtle (G. geographica)
False map turtle (G. pseudogeographica)
Texas map turtle (G. versa)
Microcepahalics (narrow-heads, freshwater sponge and aquatic invertebrate diet), 5
Yellow-blotched sawback (G. flavimaculata)
Black-knobbed sawback (G. nigrinoda)
Ouachita map turtle (G. ouachitensis)
Ringed sawback (G. oculifera)
Sabine map turtle (G. sabinensis)