Two-dimensional distribution of the dwarf and ultra diffuse galaxies in the ERO Perseus cluster field. Top left: projected distribution (white dots) and density map of the 1100 dwarf candidates within the Euclid ERO FoV of the Perseus cluster. Top right: density map (white contours) of the dwarf candidates are overlaid on the Euclid ERO I_E image of the cluster. Middle left and right: same as above, but for the ultra diffuse galaxies identified as cluster members. Bottom left and right: same as above, but for the bright (non-dwarf) galaxies identified as cluster members. The iso-density centres of the dwarfs, as well as the iso-density centre of the GCs and the isophotal centre of the ICL at semimajor-axis radius 320 kpc, are indicated with the two red, green, and blue crosses, respectively.