👉 Rhopalopsyllus is a genus of insects in the family Pterophoridae, commonly known as the black widow spiders or spider mites. They are characterized by their distinctive black and white stripes on their abdomen, which they use to hide from predators. The genus also includes other species that have similar characteristics, such as the long-legged spider mite (Mollusca), the brown spider mite, and the red-spotted spider mite.