Illustrations from PhyloPic (CC0 1.0): Jonathan Lawley (Ophiuroidea), Mario Quevedo (Asteriidae), MBARI & FathomVerse (Asteriidae). Sea urchin: Jeff Thompson. Other echinoderms retraced by Berra Aydin. London Skyline image: Shutterstock (ID 1321389620). Composition: Paola Oliveri.
