Cymbiodyta marginella

Formerly known as Cymbiodyta marginellus and shown as such in various references including the Duff and Hackston keys.

This one came to light.

Cymbiodyta marginella, North Elmham Cathedral Meadows (Norfolk, UK), 28th August 2018

This also came to light. I had a small problem keying it (initially using Duff) as Duff requires the apical maxillary palpomere to be not longer than the penultimate palpomere. On this beetle it was longer - only very slightly longer, but definitely longer. Hackston words this difference slightly differently, explicitly allowing the segments to be of equal length, and they were approximately equal. Anyway, if I take it to be longer it keys to a choice between genera that both have five tarsomeres on the mid and hind tarsi whereas this only had four, so I'm sure I have to treat them as equal. None of my references illustrate or describe the genitalia of this species (the only one in the genus in the UK) but I thought it might be useful to know what they look like in case of problems getting it (or something similar) to genus.

male Cymbiodyta marginella showing head, elytra, antenna, maxillary palp and aedeagus, Wendling Beck Environment Project (Norfolk, UK), 11th August 2025