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We obtained GALEX FUV, NUV, and Spitzer/IRAC 3.6$\mu$m photometry for > 2000galaxies, available for 90% of the S4G sample. We find a very tight "GALEX BlueSequence (GBS)" in the (FUV-NUV) versus (NUV-[3.6]) color-color diagram whichis populated by irregular and spiral galaxies, and is mainly driven by changesin the formation timescale ($\tau$) and a degeneracy between $\tau$ and dustreddening. The tightness of the GBS provides an unprecedented way ofidentifying star-forming galaxies and objects that are just evolving to (orfrom) what we call the "GALEX Green Valley (GGV)". At the red end of the GBS,at (NUV-[3.6]) > 5, we find a wider "GALEX Red Sequence (GRS)" mostly populatedby E/S0 galaxies that has a perpendicular slope to that of the GBS and of theoptical red sequence. We find no such dichotomy in terms of stellar mass(measured by $\rm{M}_{[3.6]}$), since both massive ($M_{\star} > 10^{11}M_{\odot}$) blue and red sequence galaxies are identified. The type that isproportionally more often found in the GGV are the S0-Sa's and most of theseare located in high-density environments. We discuss evolutionary models ofgalaxies that show a rapid transition from the blue to the red sequence ontimescale of $10^{8}$years.

The GALEX/S4G UV-IR color-color diagram: Catching spiral galaxies away from the Blue Sequence