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Try the provisional key to UK bristletails here

This key is based on that provied by Delaney in 1954, but updated with current taxonomic information.

It relies on fairly small characters, many of which are not easily observed in the field, and some sexes are currently not determinable with certainty.

Changes from the Delaney key include:-

Inclusion of antennae character to tentatively identify female Petrobius
Removal of Petromachillis Longicornis (now a synonym for Petrobius maritimus.
Inclusion of Dilta Chateri, Bach, Mendes, Gaju and Molero, 1995.

Any errors, omissions, suggestions for improvements and feedback welcome by FireBrat at www.bristletail.net