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The northern map turtle gets both its common and scientific names from the markings on its carapace, which resemble contour lines on a map or chart. [5] These lines are usually shades of yellow, tan, or orange, and are surrounded by dark borders, with the rest of the carapace being olive or greyish brown.
The Alabama map turtle (Graptemys pulchra) is a species of emydid turtle native to the southern United States. Differentiation from other turtle species includes a black stripe running down the center of its back with knobs extruding from it, but these projections wear down with age. T.H. Bean and L. Kumlen first collected the Alabama map turtle in July 1876 from a lake near Montgomery, Alabama.
The black-knobbed map turtle (Graptemys nigrinoda), formerly known as the black-knobbed sawback, is a small to medium-sized aquatic turtle with light gray skin. [5] Some of the most distinguishing characteristics of the black-knobbed map turtle, and the Graptemys genus , are the protruding "spikes" on the turtle's carapace .
Graptemys is a genus of freshwater turtles containing 14 species, commonly known as map turtles. [5] Graptemys are small to medium-sized turtles that are significantly sexually dimorphic, with females in some species attaining as much as twice the length and ten times the mass as males.
Ouachita map turtles feed mainly on small aquatic animals such as shrimp, insects (such as mayflies, caddisflies, beetles, grasshoppers, fly larvae, and midge larvae), molluscs, fish, and fish carrion. [7]
The Pearl River map turtle (Graptemys pearlensis) is a species of emydid turtle native to the southern United States.According to a study done in January 2017, the species G. pearlensis was significantly less abundant in the Pearl River region as compared to G. oculifera and exhibited a smaller number of reproductively mature females.
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