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.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.
Black-knobbed map turtles are seasonally active from April to late November.
Currently, this species has been petitioned and is under consideration for listing by the U.S. Fish and Wildlife Service in subcategory 3-C, but classified as Near Threatened by the IUCN Red List. The black-knobbed map turtle is most likely threatened by habitat degradation and encroachment by humans.
Black-knobbed map turtles are popular in the pet trade, but became more common because of captive breeding.