⟨ μ_eff ⟩-Luminosity diagram of the early-type galaxies in the central region of the Virgo cluster (Smith Castelli et al. 2013), showing the location of the LSB galaxies presented in this work (assuming they are at the distances of NGC 3193 and/or HCG 44), plus different samples of dSph and ultra-diffuse galaxies reported in the literature. In the case of dSph1, we plot two locations considering the distance modulii of NGC 3193 and HCG 44.