Knowledgebase
What is this bug #866493
Asked April 30, 2024, 3:01 PM EDT
Lane County Oregon
Expert Response
I can't really tell anything from your photo other than that it is a dark object on a light background. I can't even tell if it is an insect.
If it is an insect, based on your description I think it could be a type of rove beetle (Family: Staphylinidae). There are some large dark species in our region in the subfamily Staphylininae. The most common one I see is called the devil's coach horse (Ocyupus olens). They are some of the largest, all-black rove beetles that can be found in our area. Here is a link to a photo of a live one for comparison...
https://bugguide.net/node/view/669443
The devil’s coach horse is a species that is native to Europe, but it was accidentally brought over to North America and became established here. It was first noted in California in the 1930s, but now it can be found in several western states including Oregon. Like most rove beetles, devil’s coach horse beetles are predators that feed on other invertebrates (insects, earthworms, etc.). They are not harmful, but they do make intimidating postures if they feel threatened (raising the tip of the abdomen like a scorpion, and flaring the jaws). If handled roughly, they can bite defensively, but this would not result in any long-lasting effects.
Hope that helps a bit. Feel free to submit another photo if you see another one and hopefully we can confirm my tentative ID.