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The recent literature suggests that an evolutionary dichotomy exists forearly-type galaxies (Es and S0s, ETGs) whereby their central photometricstructure (cuspy versus core central luminosity profiles), and figure ofrotation (fast (FR) vs. slow (SR) rotators), are determined by whether theyformed by "wet" or "dry" mergers. We consider whether the mid infrared (MIR)properties of ETGs, with their sensitivity to accretion processes in particularin the last few Gyr (on average z < 0.2), can put further constraints on thispicture. We investigate a sample of 49 ETGs for which nuclear MIR propertiesand detailed photometrical and kinematical classifications are available fromthe recent literature. In the stellar light cuspy/core ETGs show a dichotomythat is mainly driven by their luminosity. However in the MIR, the brightestcore ETGs show evidence that accretions have triggered both AGN and starformation activity in the recent past, challenging a "dry" merger scenario. Incontrast, we do find, in the Virgo and Fornax clusters, that cuspy ETGs,fainter than M$_{K_s}=-24$, are predominantly passively evolving in the sameepoch, while, in low density environments, they tend to be more active. Asignificant and statistically similar fraction of both FR (38$^{+18}_{-11}$\%)and SR (50$^{+34}_{-21}$\%) shows PAH features in their MIR spectra. Ionizedand molecular gas are also frequently detected. Recent star formation episodesare then a common phenomenon in both kinematical classes, even in thosedominated by AGN activity, suggesting a similar evolutionary path in the lastfew Gyr. MIR spectra suggest that the photometric segregation between cuspy andcore nuclei and the dynamical segregation between FR and SR must haveoriginated before z~0.2.

A Spitzer-IRS view of early-type galaxies with cuspy/core nuclei and with fast/slow rotation