Both species are rare nationally though Black Oil Beetle appears to occur more frequently along the coast of south Gower. If you come across the species try and obtain a macro photograph of the pronotum (the segment between the head and the wing cases and from which the front pair of legs are attached); a reasonably well defined groove occurs along the rear margin of this segment (not obvious in the above photo) in Violet, but is absent in Black.
The image below shows a Black Oil Beetle photographed at Overton last spring. Note that only the males have the strangely kinked antennae.
4 comments:
Seen in Llanmadoc ..
Do you know which species - Black or Violet?
We have just returned from sealands farm,oxwich and having googled beetles,discovered that what we have seen on the coast path was a black oil beetle! Nearly 30mm in size we saw this beetle twice, the second time starting to burrow. The area where we spotted the beetle was abundant in celendines. What an amazing creature!
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