01/11/2026
🪲 A rare Welsh beetle, a remarkable discovery and some exciting news from Pembrokeshire! 💚
Although Glo i Natur CIC focuses much of its work on the former coal spoil sites of the South Wales Valleys, our conservation work takes us further afield too.
This year, Liam and Christian have been undertaking targeted surveys for one of Wales' rarest beetles, the Short-necked Oil Beetle (Meloe brevicollis), at Castlemartin Range in Pembrokeshire — an active military training site. We've been joined in the field by volunteers Cath and Cathy, helping us search for this incredibly elusive species.
The Short-necked Oil Beetle has a remarkable history in Wales. Previously thought to be extinct here, with a 1945 record near Tylwch (Powys) regarded as the last Welsh occurrence, it was rediscovered by chance at Castlemartin in 2015. The Range remains its only known surviving location in Wales, and the species is considered Vulnerable to extinction in Britain.
The beetle was last recorded alive at the site in 2022, so its continued presence was a real concern. Throughout spring and summer this year, we've been returning to the Range in search of signs of the species.
And we had some fantastic news! 🎉
We were delighted to discover several of its tiny larvae, known as triungulins, on flowers around one of the bays. Measuring just 0.5 mm long, these extraordinary little larvae are easily overlooked, but their discovery provides confirmation that the Short-necked Oil Beetle is still persisting at its only known Welsh site, following a four-year gap in live sightings of adults or larvae.
Oil beetles have a fascinating lifecycle, with newly hatched triungulins climbing onto flowers and waiting for visiting solitary bees. When a bee arrives, they hitch a ride back to its nest, where they continue their development. It's an extraordinary relationship that makes the conservation of this species dependent on both suitable habitat and healthy solitary bee populations.
We're really pleased to see this important story receiving local news coverage, including this recent feature from BBC Wales:
👉 Read the BBC Wales article here: https://www.bbc.co.uk/news/articles/cry8317pdp5yo
A huge thank you to Cath and Cathy for their help and enthusiasm in the field, and to everyone involved in the ongoing conservation work at Castlemartin.
It's a privilege to contribute to the conservation of such a rare and remarkable part of Wales' natural heritage. 💚