Sespia ultima (Schultz and Falkenbach 1968, Late Oligocene, 25 mya) is a small oreodont, nesting basal to the others in the LRT. Note the large antorbital fenestra (aof) here and in other species. Arrow points to the very loose jaws joint apparently not so loose in two other species. Note the very large tympanic bulla (dark yellow) and raised auditory meatus, as in extant horses by convergence. |