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We study the evolution of kinematically-defined stellar discs in 10Fornax-like clusters identified in the TNG50 run from the IllustrisTNG suite ofcosmological simulations. We considered disc galaxies with present-day stellarmass $M_{\star}\geq 3 \times 10^{8} M_{\odot}$ and follow their evolution sincefirst entering their host cluster. Very few stellar discs survive since fallingin such dense environments, ranging from 40% surviving to all being disrupted.Such survival rates are consistent with what reported earlier for the two moremassive, Virgo-like clusters in TNG50. In absolute terms, however, the lownumber of present-day disc galaxies in Fornax-like clusters could be at oddswith the presence of three edge-on disc galaxies in the central regions of theactual Fornax cluster, as delineated by the Fornax3D survey. When looking atthe Fornax analogues from random directions and with the same selectionfunction of Fornax3D, the probability of finding three edge-on disc galaxies inany one Fornax-like cluster in TNG50 is rather low, albeit not impossible. Wealso compared the stellar-population properties near the equatorial planederived from integral-field spectroscopy for the three edge-ons in Fornax tosimilar line-of-sight integrated values for present-day disc galaxies in TNG50.For one of these, the very old and metal-rich stellar population of its disccannot be matched by any the disc galaxies in TNG50, including objects in thefield. We discuss possible interpretations of these findings, while pointing tofuture studies on passive cluster spirals as a way to further teststate-of-the-art cosmological simulations.

The survival of stellar discs in Fornax-like environments, from TNG50 to real galaxies