The following links provide a great deal of information about various specific groups of invertebrates living in aquatic habitats:
The Water Flea website:An introduction to Water Fleas and lake ecology.
The Virtual Pond Dip:
An introduction to microscopic pond life
The Freshwater Life site:
This site is a growing resource includes some downloadable keys
The Freshwater Biological Association site:
Worth looking at for the range of keys available, although a full set would be very expensive.
The Mayfly Recording Scheme website:
Information on studying Mayflies and descriptions of the 51 species found in the UK
CAMSTARS ~ The River Flies Recording Schemes website:
Information and contact details for Mayflies, Stoneflies & Caddis recording
Heteroptera News
.. has information on aquatic bugs in several downloadable magazines
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