Invertebrates
- Crayfishes of Wisconsin
- The Wisconsin Crustaceans Homepage is an information resource based on Milwaukee Public Museum collections and research. The primary focus is on crayfish, with images and data from the Milwaukee Public Museum book The Crayfishes and Shrimp of Wisconsin.
- Mathiak Collection of Freshwater Mussels of Wisconsin
- The Milwaukee Public Museum Mollusk Collection contains specimens from freshwater, terrestrial and marine habitats around the world. The most significant holdings are from Wisconsin, a major portion of these being freshwater mussels collected and donated by Harold A. Mathiak.
- Slugs of Wisconsin
- The Wisconsin Slugs Homepage focuses on species already reported for the state, with images and data from the Milwaukee Public Museum project, Visual Guide to the Slugs of Wisconsin. This project has been supported in part by the Wisconsin Department of Agriculture, Trade & Consumer Protection and by the Wisconsin Department of Natural Resources.
- Sponges of Wisconsin
- The Wisconsin Sponges Homepage is an information resource based on Milwaukee Public Museum collections and research. The primary focus is on freshwater sponges, with images and data from the Milwaukee Public Museum project, Visual Guide to the Sponges of Wisconsin, supported in part by a grant from the Wisconsin Department of Natural Resources.