Hoplopleuridae

Definition

A family of sucking lice (order Psocodea, suborder Anoplura) that are obligate ectoparasites of small mammals, particularly rodents and insectivores. Members of this family are characterized by their narrow, elongate bodies, well-developed tarsal claws adapted for gripping host hair, and relatively small size compared to other anopluran families. The family comprises approximately 6 genera and more than 150 described species, with Hoplopleura and Polyplax being the most species-rich genera. These lice are of veterinary and ecological interest due to their role in disease transmission, including the potential to vector rickettsial pathogens among rodent populations.

Etymology

From Greek hoplon (weapon, tool) + pleura (side, rib), referring to the robust lateral thoracic structure; family suffix -idae.

Example

Hoplopleura acanthopus, a common parasite of the brown rat (Rattus norvegicus), exemplifies the family's narrow body plan and host-specificity; heavy infestations can cause anemia and stress in laboratory rodent colonies, making this species a significant concern in animal husbandry and research settings.

Related Terms

• Anoplura
• Psocodea
• Polyplax
• Hoplopleura
• sucking louse
• Ectoparasite
• phthiriaptera

Usage Notes

Hoplopleuridae is distinguished from the related family Polyplacidae (also sucking lice of rodents) by differences in antennal segmentation and thoracic sclerotization; both families are sometimes confused with the chewing lice (Mallophaga) but are readily separated by the presence of piercing-sucking mouthparts. The family is primarily Holarctic in distribution, though some species have spread globally with introduced rodent hosts. In taxonomic literature, the family is sometimes grouped with Haematopinidae and Linognathidae in discussions of blood-feeding lice, but molecular studies continue to refine its phylogenetic placement within Anoplura.