Catocala coniuncta is a circum-Mediterranean species of moth whose range extends across southern Europe, North Africa and extending to the Middle East. Its species name has for a long time been misspelled "conjuncta"; this was only corrected in 2010.
Like other related species C. coniuncta has mottled brown fore-wings and crimson-red hind-wings with a black central line. The species differs from its European congeners in the shape of the post-median line on the fore-wing and the straighter black line on the hind-wings. The larvae feed on holm oak (Quercus ilex).
Extra-limitally, C. coniuncta has occurred just once in Britain, being found at light by Robin Harvey at the RSPB Minsmere reserve on the Suffolk coast on 14 September 2004.[1] Following this record the English name Minsmere crimson underwing has been adopted.