  The fundamental manifold (FM), an extension of the fundamental plane
formalism, incorporates all spheroid-dominated stellar systems from dwarf
ellipticals up to the intracluster stellar populations of galaxy clusters by
accounting for the continuous variation of the mass-to-light ratio within the
effective radius r_e with scale. Here, we find that Local Group dwarf
spheroidal and dwarf elliptical galaxies, which probe the FM relationship
roughly one decade lower in r_e than previous work, lie on the extrapolation of
the FM. When combined with the earlier data, these Local Group dwarfs
demonstrate the validity of the empirical manifold over nearly four orders of
magnitude in r_e. The continuity of the galaxy locus on the manifold and, more
specifically, the overlap on the FM of dwarf ellipticals like M 32 and dwarf
spheroidals like Leo II, implies that dwarf spheroidals belong to the same
family of spheroids as their more massive counterparts. The only significant
outliers are Ursa Minor and Draco. We explore whether the deviation of these
two galaxies from the manifold reflects a breakdown in the coherence of the
empirical relationship at low luminosities or rather the individual dynamical
peculiarities of these two objects. We discuss some implications of our results
for how the lowest mass galaxies form.
