Host-plant-specialization
Guides
Alconeura
Alconeura is a genus of leafhoppers in the family Cicadellidae, subfamily Typhlocybinae. At least one species, A. bisagittata, has been documented as a specialist on Florida rosemary (Ceratiola ericoides). The genus was established by Ball & DeLong in 1925. Members belong to the tribe Dikraneurini, a group of small, often plant-associated leafhoppers.
Anaea troglodyta
Florida leafwing, Portia, Florida goatweed butterfly, Jamaican tropical leafwing, Cuban red leaf
A Nymphalidae butterfly with a wingspan of 76–90 mm, found in southern Florida and throughout the Caribbean. The species exhibits seasonal polyphenism, with distinct dry-season and wet-season forms. Larvae feed on Croton species, while adults consume rotting fruit, dung, and fluids. Taxonomic status is contested: some authorities recognize over 230 species in the genus Anaea, while others (following Lamas 2004) treat all populations as a single species, Anaea troglodyta.
Anthemurgus
passionflower bee
Anthemurgus is a subgenus within Protandrena (family Andrenidae) containing at least one confirmed species, P. (Anthemurgus) passiflorae, commonly called the passionflower bee. This bee is notable for extreme host-plant specialization (monolecty) on Passiflora lutea, the yellow passionflower. The subgenus has undergone repeated taxonomic revision, having been treated as a monotypic genus, a subgenus of Pseudopanurgus, and currently as a subgenus of Protandrena. A chromosome-level genome assembly has been completed for the sole species.
Battus philenor
pipevine swallowtail, blue swallowtail
Battus philenor, commonly known as the pipevine swallowtail or blue swallowtail, is a North American swallowtail butterfly distinguished by its iridescent blue hindwings and aposematic black coloration. The species is chemically defended throughout all life stages through sequestration of aristolochic acids from its obligate host plants in the genus Aristolochia. Females exhibit sophisticated host discrimination behavior, selecting plants based on leaf quality and bud characteristics. The butterfly serves as a model for Batesian mimicry by several palatable butterfly species. Populations in central California have shown resilience to drought conditions, contrasting with declines in montane butterfly faunas.
Callophrys henrici
Henry's elfin, woodland elfin
Callophrys henrici, commonly known as Henry's elfin or woodland elfin, is a small North American butterfly in the family Lycaenidae. The species exhibits distinct population groups with different host plant associations: Atlantic Coast populations feed on various hollies (Ilex species), while northern and Appalachian populations use redbud (Cercis canadensis). The species has shown recent range expansion in New England due to adoption of introduced common buckthorn (Rhamnus cathartica) as a host plant. It is listed as a species of special concern in Connecticut.
Callophrys irus irus
Frosted Elfin
Callophrys irus irus is the nominate subspecies of the frosted elfin butterfly, a rare Lycaenid with a historical range spanning from Ontario to Florida and west to Texas and Wisconsin. Genetic studies have found no evidence that this subspecies is genetically distinct from other populations, including the historically recognized C. i. arsace. The species inhabits fire-maintained pine barren habitats and has experienced significant population declines due to habitat loss and fragmentation. Conservation efforts focus on managing habitat patch area and host plant abundance to improve occupancy probability.
Celastrina
Holarctic Azures
Celastrina is a genus of small butterflies in the family Lycaenidae, commonly known as the Holarctic Azures. The genus is distributed across the Palearctic, Nearctic, Indomalayan, and Australasian realms. Species within this genus are typically associated with specific host plants, with larvae showing varying degrees of dietary specialization. Several species have been studied in detail for their ecological relationships, including facultative mutualisms with ants.
Dalbulus
corn leafhoppers
Dalbulus is a genus of leafhoppers in the family Cicadellidae, subfamily Deltocephalinae, tribe Macrostelini. The genus comprises approximately 11 species, with 10 species occurring in Mexico. Several species, particularly D. maidis (corn leafhopper) and D. elimatus (Mexican corn leafhopper), are economically significant agricultural pests. These species are highly efficient vectors of maize stunting pathogens including Spiroplasma kunkelii (corn stunt spiroplasma), maize bushy stunt phytoplasma, and maize rayado fino virus. The genus exhibits a spectrum of host plant specialization, with species ranging from maize specialists (D. maidis, D. elimatus) to gamagrass specialists (D. tripsacoides, D. quinquenotatus, D. guzmani) and generalists that utilize both host types.
Enchenopa
Enchenopa is a genus of treehoppers (family Membracidae) containing more than 50 described species. The genus underwent major revision in 2014, resulting in 51 recognized species. Members are characterized by their enlarged, often ornate pronotum typical of treehoppers. The Enchenopa binotata species complex has been extensively studied as a model system for sympatric speciation through host plant shifts, with different species or populations specialized on distinct host plants and exhibiting assortative mating based on plant-associated vibrational signals.
Enchenopa binotata
Two-marked Treehopper Complex, twomarked treehopper
Enchenopa binotata is a species complex of treehoppers in the family Membracidae, currently recognized as comprising multiple cryptic species that have diverged through host plant specialization. The complex occurs primarily in eastern North America with some records in Central America. Members are morphologically similar but reproductively isolated through assortative mating based on host plant-associated vibrational communication signals. This system is a classic model for studying sympatric speciation via host shifts.
Euphydryas chalcedona chalcedona
Chalcedon Checkerspot
Euphydryas chalcedona chalcedona is a subspecies of checkerspot butterfly in the family Nymphalidae. The larvae are oligophagous, feeding primarily on plants in the Scrophulariaceae family including Diplacus aurantiacus and Scrophularia californica. Populations show geographic variation in host plant use and specialization, with some colonies being monophagous on single Penstemon species while others use multiple hosts. The subspecies has been the subject of extensive research on insect-plant coevolution, host preference, and population biology.
Eupithecia gelidata
Frosted Pug
Eupithecia gelidata is a small geometrid moth with a wingspan of 17–22 mm, distributed across northern boreal and arctic regions. Adults are active from June to mid-July, with one generation per year. Larval host plant associations vary geographically: South Bohemian populations are obligatorily associated with Ledum palustre, while subarctic and boreal populations use Salix spp. as alternative hosts. The species has been documented visiting apple flowers, contributing to nocturnal pollination services.
Junonia coenia
Common Buckeye, Buckeye
Junonia coenia, commonly known as the common buckeye, is a distinctive butterfly in the family Nymphalidae. It is widely distributed across North America, Central America, and parts of northern South America. The species is known for its prominent eyespots on the wings and its migratory behavior, moving south in autumn to escape cold temperatures. Adults feed preferentially on yellow flowers, while larvae specialize on plants containing iridoid glycosides.
Leptinotarsa defecta
Twoline Satansbos Leaf Beetle
Leptinotarsa defecta is a leaf beetle in the family Chrysomelidae, closely related to the notorious Colorado potato beetle (L. decemlineata). Unlike its congener, L. defecta is not a major agricultural pest and has been observed feeding on Solanum species in Florida. The species has a broad geographic distribution spanning North America, Middle America, and Africa, though detailed natural history information remains sparse.
Lygaeinae
Lygaeinae is a subfamily of ground bugs (Hemiptera: Lygaeidae) commonly known as milkweed bugs. Members are characterized by ancestral adaptations for sequestering cardenolides—potent cardiac glycosides from host plants—using resistant Na+/K+-ATPases. These coevolved traits enable chemical defense against predators and have facilitated host shifts to cardenolide-producing plants across multiple families. The subfamily exhibits diverse feeding strategies from dietary specialists to generalists, with sequestration mediating predator-prey interactions with vertebrates and invertebrates.
Orthotylinae
Orthotylinae is a large subfamily of plant bugs (Miridae) comprising at least 650 described species across at least 70 genera. Members are distributed globally, with particularly high diversity in Australia and the Palearctic region. The subfamily is traditionally diagnosed by the possession of lamellate, apically divergent parempodia—a distinctive morphological trait of the pretarsus. Multiple tribes are recognized, including Orthotylini, Halticini, Ceratocapsini, Coridromiini, Nichomachini, and Austromirini.
Plebejus idas
Idas blue, northern blue
Plebejus idas is a small blue butterfly in the family Lycaenidae, widely distributed across the Palearctic and Nearctic realms. Males display iridescent blue upper wings, while females are brown with orange submarginal spots. The species exhibits notable geographic variation in its ecological relationships, including facultative versus obligate myrmecophily. The critically endangered subspecies P. idas lotis (lotis blue butterfly), native to coastal California, is believed extinct since 1994.
Stiriinae
owlet moths
Stiriinae is a subfamily of owlet moths (Noctuidae) comprising approximately 160 described species across more than 20 genera. The group underwent significant taxonomic revision in 2019–2021 based on phylogenetic research, with the former tribe Stiriini elevated to subfamily status and internal classification reorganized into two tribes: Stiriini and Annaphilini. The subfamily exhibits exceptional host plant specialization, with many species feeding on a single Asteraceae species.
Tamalia
Ericaceous Gall Aphids, Manzanita Leaf Gall Aphids
Tamalia is a Nearctic genus of gall-forming aphids and the sole genus in the subfamily Tamaliinae. Eight described species induce galls on woody plants in the heath family (Ericaceae), primarily on manzanita (Arctostaphylos) and related genera. The genus exhibits a distinctive social system in which multiple foundresses co-occupy galls, a trait that has been exploited by the evolution of socially parasitic inquiline species within the same genus.
Timema cristinae
Cristina's Timema
Timema cristinae is a small, flightless stick insect endemic to a restricted region of southern California chaparral. The species exhibits striking color-pattern polymorphism with green, striped, and melanic morphs that provide differential camouflage on two host plants: Adenostoma fasciculatum (chamise) and Ceanothus spinosus. It has become a prominent model system for studying ecological speciation, host adaptation, and the interplay between natural selection and gene flow. The species reproduces sexually with females laying single eggs coated in ingested soil, which require soil contact for successful development.
Troidini
Birdwings, Cattlehearts, Pipevine Swallowtails
Troidini is a tribe of swallowtail butterflies (Papilionidae: Papilioninae) comprising approximately 135 species across 12 genera. The tribe is notable for its strict specialization on host plants in the family Aristolochiaceae (pipevines), from which larvae sequester aristolochic acids for chemical defense. This sequestration renders adults distasteful to vertebrate predators and has driven the evolution of aposematic coloration, primarily black wings with contrasting spots or bands in white, orange, or blue. The tribe includes well-known species such as the pipevine swallowtail (Battus philenor) and Polydamas swallowtail (Battus polydamas), as well as the birdwings (genus Ornithoptera). Troidini butterflies serve as models for Batesian mimicry complexes, with numerous palatable butterfly species converging on similar color patterns to gain protection from predators.