Figure 2 — Representative Orsten fossil arthropod larvae. (a–c) Rehbachiella kinnekullensis, a possible relative of crustaceans such as sea monkeys. Image (c) is a magnification of the limbs of the fossil in (b), illustrating exquisitely preserved sensory hairs in orange (the scale bar is 30 micrometres, or a little smaller than the diameter of a human hair!). (d) Bredocaris admirabilis (discussed below). (e–f) The phosphatocopines Klausmuelleria salopensis and Hesslandona angustata, with their protective carapaces split open to reveal details of the limbs. What animal groups they belong to remains a source of controversy. (g–h) Yicaris dianensis, with a possible crustacean structure magnified in image (h) in purple.