Cimicidae
Guides
Cimex
bed bugs, bedbugs
Cimex is a genus of obligate hematophagous insects in the family Cimicidae, commonly known as bed bugs. The genus includes species specialized on different hosts, with C. lectularius (common bed bug) feeding primarily on humans and C. hemipterus (tropical bed bug) occurring in warmer regions. Other species such as C. pipistrelli, C. pilosellus, and C. adjunctus specialize on bats. Bed bugs are wingless, nocturnal parasites that have undergone global resurgence since the late 1990s, likely due to insecticide resistance, changes in pest control practices, and increased international travel.
Cimex adjunctus
Eastern Bat Bug
Cimex adjunctus, commonly known as the Eastern Bat Bug, is a temporary ectoparasite of bats found across North America. Unlike the common bed bug (Cimex lectularius), this species is specialized on insectivorous bats rather than humans. It feeds on blood but does not remain on its host between meals, instead hiding in roosting sites. The species has been documented from multiple bat hosts including the big brown bat (Eptesicus fuscus), Rafinesque's big-eared bat (Corynorhinus rafinesquii), and the Eastern Small-footed Myotis (Myotis leibii). Research indicates that host association influences genetic variation in salivary protein genes, suggesting host-specific adaptation.
Cimex pilosellus
Western Bat Bug, Bat Bug
Cimex pilosellus, commonly known as the western bat bug, is a blood-feeding ectoparasite in the family Cimicidae. The species is native to North America and primarily parasitizes bats, though it can bite humans when bat hosts are absent. It is morphologically similar to the common bed bug (Cimex lectularius) and requires microscopic examination for accurate identification. The species has been documented across western North American regions.
Cimicinae
bed bug subfamily
Cimicinae is a subfamily of blood-feeding ectoparasites in the family Cimicidae, established by Latreille in 1802. The subfamily includes the most economically significant bed bug species, notably the cosmopolitan human parasites Cimex lectularius and Cimex hemipterus. It represents one of six subfamilies in Cimicidae and occupies a central position in the family's phylogeny.
Eutinobothris pilosellus
Eutinobothris pilosellus is a bat-associated cimicid bug formerly classified in the genus Cimex. Fossil remains from the Paisley Five Mile Point Caves in Oregon, dating to 5,100–11,000 years ago, represent the oldest known specimens of the genus Cimex/Eutinobothris. Unlike Cimex lectularius, this species has not been documented as a human parasite. The species remains extant and continues to parasitize bats in western North America.
Oeciacus
swallow bug, barn swallow bug
Oeciacus is a genus of haematophagous ectoparasites in the family Cimicidae, historically recognized as swallow bugs. Molecular phylogenetic studies have shown the genus to be nested within Cimex, leading to its proposed synonymy with that genus. The three described species—O. hirundinis, O. montandoni, and O. vicarius—are specialized parasites of swallows (Hirundinidae), with distinct morphological characters associated with this host relationship. The American swallow bug O. vicarius is particularly well-studied, occurring primarily in cliff swallow colonies across North America.
Oeciacus vicarius
American swallow bug, cliff swallow bug, swallow nest bug
Oeciacus vicarius is a blood-feeding cimicid bug specialized as an ectoparasite of colonially nesting American cliff swallows (Petrochelidon pyrrhonota). It is widely distributed across North America, where it inhabits swallow nests in natural and anthropogenic structures. The species is a known vector of Buggy Creek Virus (Alphavirus, Togaviridae). Though it will bite humans when encountered, it does not establish persistent infestations in human dwellings.
Ornithocoris
Ornithocoris is a genus of hematophagous cimicid bugs that parasitize birds. Species in this genus are temporary ectoparasites, feeding on blood during all life stages and retreating to nests or shelter crevices between meals. The genus includes economically significant poultry pests, with O. toledoi documented from galliform hosts and parrots in South America and the southern United States.
Ornithocoris pallidus
Ornithocoris pallidus is a species of bed bug in the family Cimicidae, first described by Usinger in 1959. It belongs to the subfamily Haematosiphoninae, which comprises cimicids associated with birds and bats. The genus Ornithocoris is distinguished from other cimicid genera by its association with avian hosts. The species epithet 'pallidus' refers to its pale coloration. Distribution records indicate presence in North America and South America, though specific details regarding its biology and ecology remain poorly documented in the available literature.