Figure 1 — Examples of the ‘big five’ groups of modern arthropods, including A, a partial reconstruction of the pycnogonid (sea spider) Nymphon gracilis; B, the scorpion (chelicerate) Pandinus imperator; C, the giant centipede Scolopendra giganteus; D, a nymph of the mayfly Baetis sp.; and E, the common lobster Homarus gammarus.