The arachnid collection of the Invertebrate Zoology collection contains more than 1800 specimens that are prepared, labelled, and ready for study. Invertebrate Zoology’s overarching collection’s primary strengths are Lepidoptera and Coleoptera but with strong collections in Diptera, Odonata, Heteroptera, Homoptera, Hymenoptera, and Siphonaptera. These collections augment studies by staff, but they are also used for research by hundreds of specialists worldwide where they constitute the basis for numerous scientific publications. These collections benefit present and future generations, and in their immensity comprise a public trust as a unique record of the natural world.