Eastern painted turtle (C. p. picta)
A variant of Painted turtle (Chrysemys picta)

Representative Painted turtlephoto — a dedicated image of this exact morph isn't available yet.
The nominate subspecies of the eastern US, distinguished by carapace scutes aligned in straight rows and a plain olive-to-black shell with red marginal markings. Wild-type form most often seen in the northeastern hobby.
Keeper tips for this variant
Provide a strong basking spot of 90F with UVB; like all painted turtles it basks heavily and needs a dry haul-out to prevent shell rot.