Ancient Web: Berkeley’s Gastropod Guide Explained Snails Beyond Their Shells

Part of the Ancient Web Collection.

A snail shell looks simple until a museum begins listing everything that can live inside one, live without one, or spend its life drilling through another.

Visit UC Berkeley’s guide to the Gastropoda.

The University of California Museum of Paleontology explains an entire branch of the mollusc family in a single illustrated reference. Its introduction discusses snails, slugs, limpets, and sea hares, and gives a figure of more than 62,000 described living species. Those are the page's figures, not a freshly verified count for 2026.

There are fossil references stretching back to the Early Cambrian, photographs of shells from different oceans, and sections on life history, anatomy, and classification. A Partula tree snail from Moorea appears near the top, an especially evocative choice for a lesson on biodiversity.

The old taxonomy stays visible

The guide explains torsion: during development, the gastropod body twists, moving the mantle cavity forward. It discusses the radula used in feeding, the muscular foot, the operculum that can seal a shell, and developmental stages called trochophore and veliger.

Its classification separates neritopsines, vetigastropods, caenogastropods, heterobranchs, true limpets, and cocculinids. The prose acknowledges scientific uncertainty about relationships among several groups. That caution is one of the best things to preserve in an educational page: taxonomy is an ongoing interpretation of evidence, not a perfectly finished filing cabinet.

The image credits also tell a story. Original text is credited to Paul Bunje; individual photographs are attributed to Carole Hickman, Sherry Ballard, Daniel Geiger, and others. Some credits carry dates around 1999, 2002, and 2004. The page also retains a bare '[Need content]' placeholder in the fossil-record section.

These are signs of a working institutional reference rather than a glossy article rebuilt from scratch. The site belongs to Berkeley's older tradition of museum web teaching, although the exact publication date of this particular revision is not stated.

A related Ancient Web article covers the museum's lichen pages. This is a separate biological subject with a distinct specimen gallery and explanatory text.

Explore the gastropod illustrations and the museum’s broader Mollusca overview.

Part of the Ancient Web Collection.