“…The interstitial, marine flatworm M. lignano , studied for diverse biological processes (Wudarski et al, 2020) including sexual selection (Brand et al, 2020; Marie-Orleach et al, 2021), bio-adhesion (Lengerer et al, 2014), genome evolution (Wasik et al, 2015; Zadesenets et al, 2017; Wiberg et al, 2023), and host-microbiome interactions (Ma et al, 2023), is also capable of regenerating all tissues posterior to the pharynx but not anterior structures, presenting a unique opportunity to compare the molecular and cellular basis of regenerative and non-regenerative outcomes (Egger et al, 2006, 2009). In addition, M. lignano is conducive to live imaging thanks to its small body size, optical transparency, minimal autofluorescence, and robust physiology.…”