Saw this dark, glossy thing gliding across my garden path. It has a pale stripe down its back and moves smoothly like a leech rather than inching like a worm. It looks totally foreign. What is it?

likely visitor is the blue garden flatworm, Caenoplana coerulea, an Australian native introduced to other regions through transported plants and soil. Its dark, shiny upper surface, pale central stripe, and blue underside offer useful identification clues. Tiny beating cilia carry it across a film of mucus, creating that startling glide. It hunts small continue reading …