Detailed "sketch" showing the location of several classes of galaxy on an MV vs µ(0) plot. Notice first, Ellipticals (E) and Spheroidals (filled circles) form two completely different sequences -- the Spheroidals overlapping significantly with disk systems. Second, the Ellipticals divide at MV ~ 20.5 into high-central surface brightness "coreless" ellipticals; and low-central surface brightness "core" ellipticals. Globular clusters (yet another class of "hot" system) are far removed and have yet another formation mechanism. [All figures from Kormendy et al 2009 o-link]
Although this shows continuity between Spheroidals, low and high luminosity ellipticals -- a gradually increasng Sersic index n with increasing luminosity, the other plots show these are really rather different classes of system.
These plots also show the difference between the spheroidals and the ellipticals, though the distinction between the low and high luminosity ellipticals is less obvious.