Aulonium trisulcus

This species was formerly placed within Colydiidae, but that family is now treated as a subfamily (Colydiinae) of Zopheridae.

It seems to be quite an unusual species - the first records in Norfolk were found under Elm bark in 2006 and since (up to 2023) there have only been my three below and two other records to light in 2020.

This keyed fairly straightforwardly. It came to LED lights.

Aulonium trisulcus, Wendling Beck Environment Project (Norfolk, UK), 21st August 2023

This one also came to LED lights at a different location within the same project area as above.

Aulonium trisulcus, Wendling Beck Environment Project (Norfolk, UK), 3rd September 2023

This one came to MV light in my garden.

Aulonium trisulcus showing close-up of elytral and pronotal striae, North Elmham (Norfolk, UK), 7th August 2020