Summary of the available standard invertebrate species for soil ecotoxicological assays: (A) Eisenia andrei; (B) Folsomia candida; (C) Enchytraeus crypticus; (D) Hypoaspis aculeifer. Photos reproduced with permission from: (B) C. M. Ribeiro, picture of the species Folsomia candida; (A) and (C) C. A. Santos, pictures of the species Eisenia andre and Enchytraeus crypticus; (D) M. Bianchi, picture of the species Hypoaspis aculeifer.