Lungfishes are a major group of lobe-finned fishes, but are today represented by only a handful of species in freshwater habitats. The fossil record shows that they were once much more diverse and lived just about everywhere, including in marine habitats. This shirt features (from top to bottom) Neoceratodus forsteri from Recent-Pliocene deposits of eastern Australia, Gosfordia truncata from the Lower Triassic of New South Wales, Griphognathus whitei and Rhinodipterus kimberleyensis from the Upper Devonian of Western Australia, Howidipterus donnae from the Middle Devonian of Victoria, and Speonesydrion iani from the Lower Devonian of New South Wales. Inspired by Bland et al. (2025) “Comparison of diverse mandibular mechanics during biting in Devonian lungfishes.” https://www.cell.com/iscience/fulltext/S2589-0042(25)01231-3