Red-eared slider × yellow-bellied slider

Intergradation of two turtle subspecies

The red-eared slider × yellow-bellied slider is an intergradation of a red-eared slider and yellow-bellied slider subspecies. Intergrade facial markings range from a yellow blotch behind each eye, which may join a yellow neck stripe forming a “C” figure when viewed from the left side to those with an almost indistinguishable amount of red in the eye blotch, to individuals that look similar to red-eared sliders with a red “ear” stripe that doesn’t join with a yellow neck stripe. In addition, the number of black blotches on the plastron varies in intergrades from two on the front scutes which is typical of yellow-bellied sliders, to a dark blotch on each scute which is typical of red-eared sliders. Intergrades are presumed to be omnivorous, but hatchlings and juveniles are more carnivorous than adults.

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