The projected angular momentum parameter λ vs. ellipticity ϵ _e/2 within half the effective radius. The dashed curve indicates the dividing line between the slow- and fast-rotator classification (E. Emsellem et al. 2007). Colored circles: our data. Gray squares: the Virgo dEs of E. Toloba et al. (2015). Gray X-marks: the Fornax dEs of N. Scott et al. (2020). Gray triangles: the infalling Virgo dEs of B. Bidaran et al. (2020). Light-gray crosses: the massive Virgo cluster ETGs (M _* ∼ 10¹⁰–10¹² M _☉) of E. Emsellem et al. (2011), which are part of the ATLAS^3D survey (M. Cappellari et al. 2011). Light-gray diamonds: the massive ETGs of E. Emsellem et al. (2011) that are not part of Virgo. Light-gray dots: the massive ETGs of K. Mehrgan et al. (2023).