Rhopalopsyllida

Rhopalopsyllida is an infraorder of fleas belonging to the order Siphonaptera. Fleas in this group are characterized by certain morphological features, particularly in the structure of their antennae and genitalia. They are primarily ectoparasites of mammals, with a strong association with rodents. The infraorder Rhopalopsyllida contains several families, including Rhopalopsyllidae and Malacopsyllidae.

Species within Rhopalopsyllida are found worldwide, though their distribution is often tied to the geographic ranges of their host animals. They play a role in the transmission of various pathogens, acting as vectors for diseases affecting both animals and humans, such as plague. The life cycle of these fleas involves egg, larval, pupal, and adult stages, with the adult flea being the parasitic stage that feeds on blood. Research on Rhopalopsyllida contributes to our understanding of flea evolution, host-parasite interactions, and disease ecology. Their specific adaptations for clinging to and feeding on their hosts are subjects of scientific study.