Black-tailed Skimmer (Orthetrum cancellatum) is a fairly common and widespread dragonfly species in the county; in lowland areas, a skimmer dragonfly will be this species rather than Keeled Skimmer (O. coerulescens), but both species are found in the uplands of the northwest.
The oldest record in our data set is from St Mellons on 18 July 1984 (observer P. Jones).
Current distribution in the county: what we know
There are many post-2019 records across the western and central Gwent Levels, around Newport and in Torfaen, with another cluster of records in the northwest uplands between Rhymney and Blaenavon. Away from these areas it also occurs at Pen-y-fan Pond near Oakdale, on the River Usk at Abergavenny and at Overmonnow ponds in Monmouth.
Current distribution in the county: what we don’t know
As with many species, there are large areas in the north and centre of the county with no records at all, or with only older records. This is almost certainly because no-one has visited sites in these areas recently to record dragonflies, rather than because the species is not present: there are many suitable sites there.
There are no recent records from the eastern part of the Levels, but given that this is an abundant species around Uskmouth, for example, it is likely to still be present further east too.
In the western valleys and northwest uplands, there are several sites with pre-2020 records, at which this species may still be present.
Black-tailed Skimmer is found widely throughout the four southernmost counties of Wales, particularly nearer the coast; it is still quite widespread in Powys and along much of the west coast, and again in Anglesey and the northeast, but is very scarce elsewhere in the north of the country. It is widespread throughout England as far north as southern Cumbria and Newcastle-upon-Tyne, but is absent from much of the Pennines; in Scotland it has only been recorded in southeastern coastal areas. Elsewhere in Europe, it is found from Ireland and Portugal east to Russia, and from the Mediterranean north to southern Scandinavia and southern Finland. There are also populations in north Africa and Turkey and its range extends east through Asia to Kashmir and Mongolia.