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In this Letter, we present a systematic study of lenticular (S0) galaxiesbased on mid-infrared imaging data on 185 objects taken using the Spitzer InfraRed Array Camera. We identify the S0s hosting pseudobulges based on theposition of the bulge on the Kormendy diagram and the S\'{e}rsic index of thebulge. We find that pseudobulges preferentially occur in the fainter luminosityclass (defined as having total K-band absolute magnitude M_K fainter than-22.66 in the AB system). We present relations between bulge and diskparameters obtained as a function of the bulge type. The disks in thepseudobulge hosting galaxies are found to have distinct trends on the r_e-r_dand \mu_d (0) - r_d correlations compared to those in galaxies with classicalbulges. We show that the disks of pseudobulge hosts possess on average asmaller scale length and have a fainter central surface brightness than theircounterparts occurring in classical bulge hosting galaxies. The differencesfound for discs in pseudobulge and classical bulge hosting galaxies may be aconsequence of the different processes creating the central massconcentrations.

A Spitzer Study of Pseudobulges in S0 Galaxies : Secular Evolution of Disks