Visual morphological classification of X-ray AGN hosts in clusters in comparison with field X-ray AGN (iii) and non-AGN cluster galaxies (iv). The classification was based on visual inspection of HSC images. Dominance of elliptical shapes was expected, particularly among cluster galaxies. The careful selection of control-sample galaxies based on redshift and stellar mass ensured the inclusion of similar galaxy types across all samples. Error bars indicate the 1σ confidence limits for small numbers of events (Gehrels 1986).