I found this interesting lady beetle the other day in the redwood grove. Its entire body is a shiny, polished black, which gives it a well-armored look and feel. Its wings each have a bold red-orange spot that is kind of blotchy and not a well-formed circle.
The different species can be difficult to tell apart. Iowa State University’s BugGuide had this to say: “Several species of Chilocorus in western North America cannot be separated by external features, along with an introduced species. C. stigma is also best included in this grouping for those on the boundary of known ranges.” I wonder how they decide on a different species, especially if they can’t be separated by external features.
The introduced Kuwana’s lady beetle (Chilocorus kuwanae) pretty much looks identical to Chilocorus stigma, a native to the U.S. and Canada. Cornell University’s College of Agriculture and Life Sciences writes: “ Spots of C. kuwanae tend to be deep red and rectangular and located near the center of the wing. In contrast, spots of C. stigma tend to be more orange-yellow, round and oriented more toward the head of the beetle.” Again, there are very subtle differences in differentiating between the two that seem like it could be difficult to tell in the field.
My focus quickly started to shift away from the quagmire of identification to wonder and appreciation of nature. Like other lady beetles, they are beautiful and beneficial insects that help maintain the balance of nature by eating other insects, such as aphids and scale insects. See you out there!