Keys to adults of the water beetles of Britain and Ireland. Part 2: Coleoptera: Polyphaga: Hydrophiloidea – both aquatic and terrestrial species

Cover Title Copyright Contents Dedication Abstract Acknowledgements General introduction Checklist Hydrophiloidea Introduction to the Hydrophiloidea Morphology and field characters Hydrophiloid genitalia Collecting methods for Hydrophiloidea Key 1. Hydrophiloidea and Hydraenidae Helophoridae Helophorus Key 2. The species of Helophorus Georissidae Georissus Hydrochidae Hydrochus Key 3. The species of Hydrochus Spercheidae Spercheus Hydrophilidae Anacaena Key 4. The species of Anacaena Paracymus Key 5. The species of Paracymus Berosus Key 6. The species of Berosus Chaetarthria Key 7. The species of Chaetarthria Cymbiodyta Enochrus Key 8. The species of Enochrus Helochares Key 9. The species of Helochares Hydrobius Limnoxenus Hydrochara Hydrophilus Laccobius Key 10. The species of Laccobius Coelostoma Dactylosternum Cercyon Key 11. The species of Cercyon Megasternum Key 12. The Megasternum complex Cryptopleurum Key 13. The species of Cryptopleurum Sphaeridium Key 14. The species of Sphaeridium References and further reading Distributions Appendix 1. Guidance on water beetles for non-specialists Key 15. The families of aquatic beetles Index Colour plates Illustrated keys are provided for the families, genera, species and other taxa of British and Irish members of the superfamily Hydrophiloidea (Coleoptera suborder Polyphaga). The Hydrophiloidea comprise the families Helophoridae, Georissidae, Hydrochidae, Spercheidae, and the Hydrophilidae. Most of these beetles are aquatic and this book is the second part of the Handbook series concerning water beetles. However, this work includes terrestrial Helophorus and many species in the subfamily Sphaeridiinae of the Hydrophilidae. Notes include characters for distinguishing the sexes, basic information on biology and collecting methods, and reviews of distributions in Ireland and in Britain, including the Channel Isles. A key to all families of aquatic beetles is appended