It has recently been demonstrated that the specimens from Peru and Chile are actually attributable to the closely related S. oculatus and these two similar species are sympatric in the southwestern Atlantic off Argentina. The specific name capensis refers to the type locality, the Cape of Good Hope.
Recent findings have clarified that the Peruvian and Chilean specimens are actually members of the closely related species S. oculatus, and it has been discovered that these two species share a common habitat in the southwestern Atlantic, particularly around the Cape of Good Hope.