Tortoise beetle

6429. Bug is square shaped; about 4 mm wide and 4 mm long. Eats marigolds and even toxic rhubarb leaves. It lives mainly by the cement wall of the house. love to know what is, because it eats everything a normal bug would never eat. I’ve looked on many bug identifying sites and nothing looks like it. ridge rd. Sprinfield, nova scotia. Canada

Number 6429. This is a tortoise beetle (Coleoptera: Chrysomelidae; subfamily Cassidinae) in the genus Charidotella, Click here for an example. It is not reported to be a serious pest species.