Just two British species, formerly placed in separate families: Biphyllus lunatus (Fabricius) in Nitulidae and Diplocoelus fagi (Chevrolat) in Cryptophagidae.  Both are woodland species, B. lunatus can be found in King Alfred’s cakes fungi (Daldinia concentrica), particularly on ash, while D. fagi occurs largely beneath beech bark and on sycamore.