There
are a several species of British Heptageniidae but the most widespread
and commonest is the Yellow May Dun. Although it is reputed to be
relatively rare in the south-east of England it occurs in large numbers
on our stretch of the Tillingbourne.
They are slightly spider like in appearance and have a very
pronounced flattened body and broad head. Normally they can be found clinging to stones and other
debris. Unlike shrimps and olives they swim rather slowly.
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There
are a several species of British Heptageniidae but the most widespread
and commonest is the Yellow May Dun. Although it is reputed to be
relatively rare in the south-east of England it occurs in large numbers
on our stretch of the Tillingbourne.