Host-shift
Guides
Amblycerus
pea and bean weevils, seed beetles
Amblycerus is the second most diverse genus of seed beetles in the Americas, containing over 60 described species. These bruchid beetles are specialized seed predators, with larvae developing inside seeds of various host plants. The genus exhibits complex evolutionary patterns of host plant association, having radiated from an ancestral association with Fabaceae into at least 12 other plant families including Sterculiaceae, Boraginaceae, and Humiriaceae. Species-level identification requires examination of male genitalia and pygidial morphology.
Chymomyza amoena
A Nearctic drosophilid fruit fly native to eastern United States forests. It has established as an invasive species in Europe since its discovery in former Czechoslovakia in 1975, subsequently spreading to Switzerland, Italy, and German border regions. The species exhibits a distinctive ecological strategy: breeding in damaged or parasitized nuts and fruits rather than relying solely on fermenting substrates. This behavioral constancy for interspecies dependency—exploiting substrates pre-conditioned by other insects—has enabled it to occupy a vacant niche in European ecosystems.
Coptodisca
Coptodisca is a genus of small moths in the family Heliozelidae, established by Walsingham in 1895. Species are leafminers whose larvae feed internally on leaves of woody plants, creating distinctive blotch mines. Several species have become invasive pests in Europe, particularly C. lucifluella and C. juglandiella on walnut (Juglans) and related trees. The genus is native to the Nearctic region with approximately 20 described species.
Coptodisca lucifluella
walnut shield bearer
Coptodisca lucifluella is a small leaf-mining moth in the family Heliozelidae, native to eastern North America and invasive in Europe since 2010. Larvae create distinctive blotch-shaped mines on walnut and hickory foliage, then construct oval silk-attached cases for pupation. The species has undergone a documented host shift in Europe, expanding from its native specialization on Carya (pecan) to primarily exploiting Juglans regia (common walnut) and occasionally other Juglandaceae. It completes 3–4 generations annually in Italy, with autumn generations producing substantially more mines than spring generations.
Culex erraticus
Erratic Mosquito
Culex erraticus is a mosquito species in the family Culicidae, subgenus Melanoconion. It is a documented vector of eastern equine encephalitis virus (EEEV) and West Nile virus, with females exhibiting aggressive biting behavior toward birds, mammals, amphibians, and reptiles. The species shows distinctive seasonal host-shifting behavior, feeding primarily on ectothermic hosts during warmer months and shifting to endothermic hosts during cooler periods. It has been observed overwintering as adults in gopher tortoise burrows in Florida and in swamp habitats elsewhere.
Diplolepis polita
Spiny Leaf Gall Wasp
Diplolepis polita is a gall wasp in the family Cynipidae, first described by William Harris Ashmead in 1890. The species induces distinctive spherical, spiny galls on the leaves of wild roses, primarily Rosa acicularis and Rosa arkansana, in spring and early summer. Originally known only from western North America west of the Rocky Mountains, it has demonstrated host flexibility by colonizing the introduced domestic shrub rose Rosa rugosa in urban environments. This host shift provides insight into the vagility and host specificity of cynipid wasps.
Diplolepis rosaefolii
Diplolepis rosaefolii is a gall wasp in the family Cynipidae that induces distinctive lenticular (lens-shaped) galls on the leaves of rose plants across Canada. The species exhibits an alternation of generations life cycle typical of cynipid wasps, with a bisexual spring generation producing the visible galls and an agamic (asexual) winter generation of wingless females. In Ontario and Quebec, it is primarily associated with native Rosa acicularis, though populations have been documented on the cultivated hybrid rugosa shrub rose 'Thérèse Bugnet'. The galls support a diverse component community including multiple parasitoid wasp species and inquilines.
Dryophthorinae
Dryophthorinae is a subfamily of weevils (Curculionidae) comprising approximately 1,200 species in 153 genera and ten tribes. The subfamily includes numerous economically significant agricultural pests, particularly of palms, bananas, rice, maize, sugarcane, and bromeliads. Many species are distributed in tropical and subtropical regions worldwide, with several having achieved global distributions through international trade in ornamental and agricultural plants. The taxonomic status of Dryophthorinae remains contested; while traditionally treated as a subfamily, at least one major revision has elevated it to family rank as Dryophthoridae.
Exapion ulicis
Gorse Seed Weevil
Exapion ulicis is a small seed-feeding weevil specialized on gorse (Ulex europaeus). Adults are light gray with a prominent snout roughly half the body length. The species is native to western Europe and has been introduced to New Zealand, California, Hawaii, and other regions as a biological control agent targeting invasive gorse populations. Larval feeding destroys seeds within pods, reducing plant spread, while adult feeding on stems and spines causes minor damage.
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rational-extensive-Pareto-optimal-individually-rational-Nash-stable-setminimal-weakly-retentive-Pareto-optimal-individually-rational-Nash-stable-setminimal-strongly-retentive-Pareto-optimal-individually-rational-Nash-stable-setminimal-collectively-retentive-Pareto-optimal-individually-rational-Nash-stable-setminimal-individually-retentive-Pareto-optimal-individually-rational-Nash-stable-setminimal-Nash-retentive-Pareto-optimal-individually-rational-Nash-stable-setminimal-individually-rational-retentive-Pareto-optimal-individually-rational-Nash-stable-setminimal-weakly-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-strongly-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-collectively-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-individually-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-Nash-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-individually-rational-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-weakly-Nash-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-strongly-Nash-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-collectively-Nash-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-individually-Nash-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-Nash-Nash-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-individually-rational-Nash-stable-Pareto-optimal-individually-rational-Nash-stable-setminimal-weakly-individually-rational-Pareto-optimal-individually-rational-Nash-stable-setminimal-strongly-individually-rational-Pareto-optimal-individually-rational-Nash-stable-setminimal-collectively-individually-rational-Pareto-optimal-individually-rational-Nash-stable-setminimal-individually-individually-rational-Pareto-optimal-individually-rational-Nash-stable-setminimal-Nash-individually-rational-Pareto-optimal-individually-rational-Nash-stable-setminimal-individually-rational-individually-rational-Pareto-optimal-individually-rational-Nash-stable-setHydropionea fenestralis
Hydropionea fenestralis is a small crambid moth described in 1914, with forewings 12–15 mm in length. Adults display a distinctive reticulated wing pattern and are active from May to October. The species was long considered a mystery regarding its larval biology until 2023, when researchers documented it as a seed borer in Agave salmiana fruits in central Mexico—an unusual host association given its phylogenetic placement in Glaphyriinae. The moth occurs in mountainous regions of the southwestern United States and Mexico, with confirmed records from Arizona, Mississippi, Durango, Veracruz, and Puebla.
Lyonetia
Lyonetia is a genus of moths in the family Lyonetiidae. Species in this genus are leaf miners, with larvae that feed internally between the upper and lower epidermis of leaves. The genus includes species with broad geographic distributions across northern Europe, northern Asia, and North America. One species, Lyonetia ledi, has been documented as a glacial relict population in the Swiss Alps, where it has shifted to feeding on the toxic alpine rose (Rhododendron ferrugineum).
Marmara gulosa
Citrus Peelminer
Marmara gulosa is a small gracillariid moth, approximately 4 mm in length, commonly known as the citrus peelminer. Native to the United States where it originally fed on willow (Salix lasiolepis), the species has undergone a documented host-shift to non-native plants including citrus varieties and ornamentals such as oleander. It is known from California, Arizona, Texas, and Florida, as well as Cuba. The species is of economic concern as a pest of citrus, particularly grapefruit in southwestern growing regions. A distinct species from the similar Marmara salictella, it was formally described in 2001.
Megastigmus transvaalensis
Peppertree Seed Chalcid
Megastigmus transvaalensis is a minute chalcid wasp native to South Africa that has become invasive in Mexico, Brazil, and Chile. Adults are yellowish-brown with pronounced sexual dimorphism in size. The species is a seed parasite that targets drupes of Rhus species in its native range and has shifted to Schinus species in South America, with significant implications for biological control and native plant conservation.
Nicrophorus pustulatus
Pustulated Carrion Beetle, Blistered Burying Beetle
Nicrophorus pustulatus is a North American burying beetle distinguished by its unique ecology among congeners. Unlike typical carrion beetles that bury small vertebrate carcasses underground, this species is a canopy specialist that has undergone a remarkable host shift to exploit snake eggs as a primary breeding resource. It is the only described Nicrophorus species demonstrated to function as a true parasitoid of vertebrates, attacking live reptile eggs. Adults are medium-sized (14.0–22.2 mm), predominantly black with distinctive orange elytral spots, and lack the long dorsal setae characteristic of related species. The species exhibits flexible social mating systems and facultative parental care.
Phytomyza glabricola
inkberry holly leafminer
Phytomyza glabricola is a leaf-mining fly in the family Agromyzidae, endemic to the eastern United States. The species exhibits host-associated divergence on two sympatric holly species, Ilex glabra and I. coriacea, with populations on each host showing substantial genetic divergence and reproductive isolation. Development time differs dramatically between host races: 2-4 weeks with multiple generations per year on I. glabra versus 9-10 months with a single generation per year on I. coriacea. Despite these differences, adults from both hosts emerge synchronously in mid-January to mid-February. The species provides a well-documented case of ecological speciation via host shift.
Plebejus melissa
Melissa Blue
The Melissa Blue (Plebejus melissa) is a small butterfly in the family Lycaenidae, native to western North America. This species has been extensively studied for its colonization of alfalfa as a novel host plant, representing a well-documented case of host range expansion. The Karner blue (P. m. samuelis), described by Vladimir Nabokov, is a federally endangered subspecies restricted to oak savanna and pine barren habitats in the upper Midwest.
Synergini
inquiline gall wasps
Synergini is a tribe of inquiline gall wasps in the family Cynipidae. Members have lost the ability to induce their own galls and instead inhabit galls created by other cynipid wasps, primarily those in tribe Cynipini. The tribe includes genera such as Synergus, Saphonecrus, Lithosaphonecrus, and Ufo. Most species are associated with oaks (Quercus) and related Fagaceae. A 2015 taxonomic revision transferred three former Synergini genera to other tribes: Ceroptres to its own tribe Ceroptresini, and Periclistus and Synophromorpha to Diastrophini.