Both "Sphenacodon" and "Dimetrodon" have been depicted with their short limbs splayed outward at 90 degrees from the body in a wide pushup position and with the tail (and even belly) dragging on the ground, similar to modern lizards and crocodiles. A sprawling stance is also typical for "Sphenacodon" and "Dimetrodon" skeletons as currently mounted in museums. However, trackways called "Dimetropus" (""Dimetrodon" foot") that match the foot configuration of large sphenacodontids show animals walking with their limbs brought under the body for a narrow, semi-erect gait without tail or belly drag marks. Such clear evidence for a more efficient upright posture suggests that important details about the anatomy and locomotion of "Sphenacodon" and "Dimetrodon" may not be fully understood. Some well preserved narrow "Dimetropus" tracks found in parts of the Prehistoric Trackways National Monument in New Mexico match the smaller size of "Sphenacodon", a genus known from skeletal fossils in the state, but could also come from a small "Dimetrodon".