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  • Freshwater invertebrates aidgap
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AIDGAP pair: Freshwater & Caddis

Special offer for June 2021: get two AIDGAP guides for just £12.00.

Freshwater invertebrates AIDGAP

FSC Freshwater invertebrates AIDGAP is an identification guide for ponds, lakes, streams and rivers in Britain and Ireland. Identification goes to at least family level.

The guide is a bridge between popular colour identification guides and more specialist works. Users move through a series of dichotomous keys.

You don’t need any special equipment beyond a net, white tray and hand lens. The author has spent many years of leading fieldwork, so has chosen characters visible on living specimens. These include easily observed animal behaviour where this is a useful clue. As a result, the key will work with samples collected in a standard pond net.

Caddis larvae AIDGAP

The Caddis larvae AIDGAP covers all caddis larvae found in Britain and Ireland.

The keys are for living specimens in the field, using features visible with a hand lens. Where possible identification goes to species level. Unlike previous keys, you do not need a microscope to use this guide.

Caddis larvae are very familiar aquatic insects. There is great fascination with their well-known case-building habits and abundance in many kinds of freshwater.

These two guides are part of the FSC’s AIDGAP series (Aids to Identification in Difficult Groups of Animals and Plants). Our AIDGAP guides are accessible identification keys, suitable for non-specialists from age 16+. As with all guides in the series, the Freshwater & Caddis larvae AIDGAPs underwent extensive testing before publication, by beginners and specialists alike.