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This family includes all the bristletail species that are likely to be found away from human habitation in the British Isles.
All British species from this family can easily be distinguished from the Lepismatidae by shape, as the Lepismatidae are flattened, whereas the Machilidae typically have more humped and rounded body shapes. Additionaly the Machilidae have large, compound eyes, which meet in the middle, and ocelli are present (though not always obvious). The shape of the ocelli are the best way of determining the family that the species belongs to.
In the UK the family contains the following lower taxa
|Genus||Latin Name||Synonyms||English Name|
|Dilta||Dilta Saxicola, Womersley, 1930|
|Dilta||Dilta Littoralis,W omersley, 1930|
|Dilta||Dilta hibernica, Carpenter, 1907|
|Dilta||Dilta Chateri, Bach, Mendes, Gaju and Molero, 1995||Chater's Bristletail|
|Trigoniophthalmus||Trigoniophthalmus Alternatus, Silvestri, 1904||t. britannicus , t. interupptus|
|Petrobius||Petrobius maritimus, Leach, 1809||petromachilis longicornis, reilly, 1915||Sea Bristletail|
|Petrobius||Petrobius brevistylus,Carpenter, 1913|