A tiny freshwater crab Amarinus lacustris with three eyes collected from a New Zealand river represents a unique malformation that has never been described before in a crustacean or any other arthropod. Three-eyed freshwater spider crab Amarinus lacustris. Image credit: Gerhard Scholtz et al. First described by zoologist Charles Chilton in 1882, Amarinus lacustris is an omnivorous, freshwater spider crab found in rivers of south-eastern Australia,...
