Cantharidin
Guides
Eupompha
Eupompha is a genus of blister beetles (family Meloidae) comprising approximately 14 described species distributed in arid regions of North America. Members of this genus are characterized by their association with creosote bush (Larrea tridentata) and other desert plants, on which adults feed and aggregate in mating pairs. The genus belongs to the tribe Eupomphini, which includes other genera with similar desert-adapted ecologies.
Eupompha edmundsi
Eupompha edmundsi is a species of blister beetle in the family Meloidae, first described by Selander in 1953. It belongs to the tribe Eupomphini, a group of meloid beetles primarily associated with arid and semi-arid regions of western North America. The genus Eupompha is characterized by metallic coloration and association with creosote bush (Larrea tridentata) and other desert plants. Like other members of its tribe, E. edmundsi likely exhibits the complex life history typical of blister beetles, with hypermetamorphic larvae that are parasitoids or predators of other insects.
Eupompha elegans
Elegant Blister Beetle
Eupompha elegans is a blister beetle in the family Meloidae, distributed across Central America and North America. The species comprises two recognized subspecies: Eupompha elegans elegans and Eupompha elegans perpulchra. Adults are known to feed on floral resources, with documented host associations including Chaenactis fremontii (Asteraceae) and Eschscholzia minutiflora (Papaveraceae) for the perpulchra subspecies. Like other meloid beetles, it produces cantharidin, a defensive compound.
Eupompha elegans elegans
Eupompha elegans elegans is a subspecies of blister beetle in the family Meloidae, tribe Eupomphini. It is one of two recognized subspecies within E. elegans, the other being E. e. perpulchra. The species is native to western North America. Adult beetles are known to feed on plant foliage and flowers. Like other meloids, larvae are likely hypermetamorphic, developing through distinct mobile and sedentary phases.
Eupompha fissiceps
Cleft-headed Blister Beetle
Eupompha fissiceps is a blister beetle in the family Meloidae, commonly known as the cleft-headed blister beetle. The species occurs in arid regions of southwestern North America and Central America. Adults have been observed feeding on creosote bush (Larrea tridentata) flowers, often in mating aggregations. The specific epithet 'fissiceps' refers to a characteristic division or cleft in the head structure.
Eupompha imperialis
Eupompha imperialis is a blister beetle in the family Meloidae, described by Wellman in 1912. The species is recorded from North America. As a member of the tribe Eupomphini, it belongs to a group of blister beetles known for their aposematic coloration and chemical defense. Museum collections hold 42 specimens of this species.
Eupompha schwarzi
Eupompha schwarzi is a species of blister beetle in the family Meloidae, first described by Wellman in 1909. It belongs to the tribe Eupomphini, a group of meloid beetles primarily associated with creosote bush (Larrea tridentata) and other desert vegetation in arid regions of western North America. The genus Eupompha is characterized by aposematic coloration, often with metallic green or blue hues combined with orange or red markings. Like other blister beetles, E. schwarzi possesses cantharidin, a defensive compound that causes skin blistering.
Gnathium
Gnathium is a genus of blister beetles in the family Meloidae, subfamily Nemognathinae. The genus comprises approximately 16 described species distributed primarily in North America. Members of this genus are characterized by their elongated, nectar-feeding mouthparts, which represent a distinctive adaptation within the family. The genus was established by Kirby in 1819.
Lytta
blister beetles
Lytta is a genus of blister beetles in the family Meloidae, established by Fabricius in 1775. The genus comprises approximately 70 described species in North America and over 100 species worldwide, making it one of the more diverse genera in its tribe. Species are distributed across the Americas, Europe, Asia, and Africa. Members are known for producing cantharidin, a defensive compound that causes blistering upon contact with skin.
Lytta aeneipennis
Lytta aeneipennis is a species of blister beetle in the family Meloidae, occurring in North America. As a member of the genus Lytta, it produces cantharidin, a toxic chemical compound that causes blistering upon contact with skin. The species was described by LeConte in 1851. Like other blister beetles, it serves as a chemical defense model in its ecosystem due to its potent defensive secretions.
Lytta childi
Lytta childi is a blister beetle in the family Meloidae, classified within the subgenus Poreospasta of the genus Lytta. The species was described by LeConte in 1857 and is known from western North America. Like other Lytta species, it produces cantharidin, a defensive compound toxic to vertebrates. The species is represented in museum collections with 126 specimens at the Entomology Research Museum, indicating it is moderately well-collected but not extensively studied in published literature.
Lytta comans
Lytta comans is a species of blister beetle in the family Meloidae. The species was described by Selander in 1960. It is classified within the subgenus Poreospasta of the genus Lytta. Like other members of its genus, it possesses chemical defenses based on cantharidins.
Lytta cribrata
Diamond-head Lytta
Lytta cribrata is a species of blister beetle in the family Meloidae, placed in the subgenus Paralytta within the genus Lytta. The species is found in Central America and North America. Like other members of its genus, it produces cantharidin, a defensive compound that causes blistering upon contact with skin. The species was described by LeConte in 1853 and is represented by 5 specimens in the University of California Entomology Research Museum collection.
Lytta crotchii
Crotch's Blister Beetle
Lytta crotchii is a species of blister beetle in the family Meloidae, genus Lytta. It is named after the English entomologist George Robert Crotch. Like other members of the genus Lytta, this species produces cantharidin, a toxic compound that causes blistering upon contact with skin. The species is part of the North American fauna of blister beetles.
Lytta cyanipennis
Lytta cyanipennis is a blister beetle in the family Meloidae, native to the Canadian prairies and western North America. Adults form mixed aggregations with Lytta nuttalli near bodies of water during their mid-June to early July flight period. Like other Lytta species, it possesses chemical defenses including cantharidins that can cause skin blistering. The species develops in moist soil conditions, with females depositing large egg batches averaging approximately 390 eggs.
Lytta deserticola
Lytta deserticola is a species of blister beetle in the family Meloidae, first described by Horn in 1870. It belongs to the subgenus Paralytta within the genus Lytta. The species is found in Central America and North America, with museum holdings indicating it is represented by 37 specimens in the UCR Entomology Research Museum collection. As a member of Meloidae, it likely possesses the family's characteristic chemical defense system involving cantharidins.
Lytta funerea
Lytta funerea is a species of blister beetle in the family Meloidae, first described by Fall in 1901. It belongs to the subgenus Paralytta within the genus Lytta. The species is known from North America, with museum records indicating specimens have been collected in the southwestern United States. As a member of Meloidae, it possesses the family-characteristic chemical defense system involving cantharidin, a blistering compound. The specific epithet "funerea" suggests a dark or somber coloration typical of many Paralytta species.
Lytta hoppingi
Hopping's Blister Beetle
Lytta hoppingi is a species of blister beetle in the family Meloidae, placed in the subgenus Poreospasta. It was described by Wellman in 1912. The species is known from western North America. Like other members of the genus Lytta, it produces cantharidin, a defensive compound that causes skin blistering. The species is represented by 8 specimens in the Entomology Research Museum collection.
Lytta magister
desert blister beetle, master blister beetle
Lytta magister is a large, conspicuous blister beetle native to southwestern North America. Adults are readily identified by their striking aposematic coloration: bright red head, legs, and prothorax contrasting sharply with black elytra. The species is strongly associated with desert environments, where adults emerge in spring and are frequently observed in aggregations on flowers. Larvae are predatory or parasitic on ground-nesting bees, a common life history pattern in the family Meloidae. The species possesses chemical defenses typical of the family, including cantharidins that can cause blistering upon contact with skin.
Lytta melaena
Lytta melaena is a species of blister beetle in the family Meloidae, described by LeConte in 1858. It belongs to the subgenus Paralytta within the genus Lytta. The species is known from western North America. Like other members of its genus, it produces cantharidin, a defensive compound that causes blistering upon contact with skin.
Lytta mirifica
Anthony blister beetle
Lytta mirifica, commonly known as the Anthony blister beetle, is a species of blister beetle in the family Meloidae. It was described by Werner in 1950 and is found in North America. The species belongs to the large genus Lytta, which contains numerous blister beetle species characterized by their production of cantharidin, a toxic defensive compound. Like other members of its genus, L. mirifica is likely to exhibit the typical blister beetle life cycle involving hypermetamorphosis and association with bee nests, though specific biological details for this species remain poorly documented.
Lytta morrisoni
Morrison's Blister Beetle
Lytta morrisoni is a blister beetle in the family Meloidae, subfamily Meloinae, and tribe Lyttini. It belongs to the subgenus Paralytta within the genus Lytta. The species was described by Horn in 1891. Like other members of Meloidae, it possesses chemical defenses based on cantharidins.
Lytta navajo
Lytta navajo is a species of blister beetle in the family Meloidae, first described by Werner in 1951. It is placed in the subgenus Poreospasta within the genus Lytta. The species is known from North America, with museum records indicating 29 specimens held in the UCR Entomology Research Museum collection. As a member of Meloidae, it possesses the family's characteristic chemical defense system involving cantharidins.
Lytta nuttalli
Nuttall's blister beetle
Lytta nuttalli is a North American blister beetle in the family Meloidae, first described by Thomas Say in 1824. The specific epithet honors botanist Thomas Nuttall. Adults display brilliant purple and green iridescent coloration. This species is notable for its complex life cycle involving hypermetamorphosis, with larvae developing as parasitoids in the nests of solitary bees. Adults are gregarious feeders on legumes and can occasionally damage agricultural crops. Populations are naturally limited by their dependence on native ground-nesting bees for larval development.
Lytta rathvoni
Lytta rathvoni is a blister beetle in the family Meloidae, native to North America. The species was named in honor of Simon Rathvon, a 19th-century American entomologist. As a member of the genus Lytta, it shares the characteristic chemical defense of blister beetles, producing cantharidin. The species is placed in the subgenus Poreospasta within Lytta.
Lytta sayi
Say's Blister Beetle, Say blister beetle
Lytta sayi is a blister beetle in the family Meloidae, native to North America. Like other members of its genus, this species produces cantharidin, a defensive compound that causes blistering upon contact with skin. The species was described by LeConte in 1853 and is placed in the subgenus Pomphopoea.
Lytta sublaevis
Lytta sublaevis is a species of blister beetle in the family Meloidae. It is found in North America. The species was described by Horn in 1868 and belongs to the genus Lytta, which contains numerous species of cantharidin-producing beetles. Like other members of its genus, it possesses chemical defenses that can cause skin irritation in humans.
Lytta tenebrosa
Lytta tenebrosa is a blister beetle in the family Meloidae, first described by LeConte in 1851. It is placed in the subgenus Paralytta within the genus Lytta. The species is known from North America, with 92 specimens documented in the Entomology Research Museum collection. Like other members of its genus, it possesses chemical defenses including cantharidins.
Lytta vulnerata
Lytta vulnerata is a blister beetle in the family Meloidae, characterized by bold black and orange aposematic coloration. The species is found in western North America, with subspecies L. v. cooperi occurring in more northerly regions including Idaho. Like other meloids, it produces cantharidin, a defensive compound that causes skin blistering upon contact. Adults have been observed feeding on flowers, particularly rabbitbrush (Chrysothamnus spp.).
Megetra
Red-banded Blister Beetles
Megetra is a North American genus of blister beetles (Meloidae) comprising three species: M. cancellata, M. punctata, and M. vittata. These beetles are characterized by their distinctive aposematic coloration—typically red or orange markings on black elytra—advertising their chemical defenses. The genus occurs in arid and semi-arid regions of the southwestern United States and northern Mexico, where adults are active during late summer and early fall, primarily on flowers of Asteraceae.
Megetra vittata
Megetra vittata is a blister beetle in the family Meloidae, ranging from northern Arizona to western Texas. It is one of three recognized species in the North American genus Megetra. The species produces cantharidin, a defensive toxin that is dangerous to livestock when ingested. It appears to be strictly allopatric with and ecologically similar to M. punctata.
Meloe
Oil Beetles
Meloe is a large genus of blister beetles commonly known as oil beetles, named for their defensive release of oily hemolymph containing cantharidin from leg joints and other body articulations when disturbed. Adults are flightless with shortened elytra that expose most of the abdomen, often displaying iridescent blue, green, or black coloration. The genus exhibits hypermetamorphic development with triungulin larvae that employ phoretic transport on bees to access host nests, where they consume provisions and host offspring.
Meloe americanus
Buttercup Oil Beetle, American Oil Beetle
Meloe americanus is a flightless blister beetle native to North America, commonly known as the buttercup oil beetle or American oil beetle. Adults are entirely black with occasional blue metallic iridescence, measuring 7–17 mm in length. The species exhibits a complex life cycle involving hypermetamorphosis, with triungulin larvae employing phoresy to reach host bee nests where they develop as parasites. Adults are active during late autumn through early spring, with peak emergence in December and April. The beetle is notable for its chemical defense: it secretes cantharidin, a potent blistering agent toxic to mammals at high concentrations.
Meloe angusticollis
short-winged blister beetle, oil beetle
Meloe angusticollis is a North American blister beetle known for its short elytra that leave most of the abdomen exposed. Adults release cantharidin-laden hemolymph as a chemical defense, which causes skin blistering in humans. The species exhibits hypermetamorphosis, with mobile first-instar larvae (triungulins) that parasitize solitary bees by hitchhiking to nest sites. Females are notably larger than males, reaching up to 19 mm.
Meloe dianella
Meloe dianella is a species of blister beetle (family Meloidae) first described by Pinto and Selander in 1970. It belongs to the genus Meloe, commonly known as oil beetles, which are characterized by their defensive production of cantharidins. The species is known from North America, with records from Canada (Alberta, British Columbia, and Nova Scotia). Like other members of its genus, it is presumed to have a parasitic life cycle involving solitary bees, though specific details for this species remain undocumented.
Meloe dugesi
Meloe dugesi is a species of blister beetle (family Meloidae) described by Champion in 1891. It belongs to the genus Meloe, commonly known as oil beetles, which are characterized by their defensive production of cantharidins. The species occurs in Central America and North America. Like other members of its genus, it likely exhibits the typical Meloe life cycle involving triungulin larvae that parasitize solitary bees.
Meloe impressus
blister beetle, oil beetle
Meloe impressus is a species of blister beetle in the family Meloidae, native to North America. It belongs to a genus commonly known as oil beetles, characterized by their defensive secretion of cantharidin, a potent blistering agent. The species is recorded across western and central Canada and the United States. Like other Meloe species, it likely exhibits the complex life history involving parasitic larvae that exploit solitary bees as hosts, though specific details for this species remain poorly documented.
Meloe strigulosus
Meloe strigulosus is a blister beetle in the family Meloidae, characterized by its phoretic larval behavior involving attachment to other organisms for transport. The species has been documented in coastal dune habitats in Oregon, where its ecological relationships have been specifically studied. Adults possess the typical oil beetle morphology with shortened elytra that expose much of the abdomen. Like other Meloe species, it produces cantharidin, a defensive compound toxic to vertebrates.
Meloidae
Blister Beetles
Meloidae, commonly known as blister beetles, is a family of approximately 7,500 species worldwide within the order Coleoptera. Members are characterized by their production of cantharidin, a toxic terpenoid compound that serves as a potent chemical defense against predators. The family exhibits remarkable diversity in adult morphology, with some species displaying aposematic coloration while others are cryptically colored. Life histories are complex, typically involving hypermetamorphosis with mobile triungulin larvae that often parasitize grasshopper eggs or bee nests. Adults are primarily herbivorous, with many species feeding on flowers and foliage of various plants.
Meloinae
blister beetles
Meloinae is a large subfamily of blister beetles (family Meloidae) containing at least 330 described species in multiple tribes distributed across the Holarctic, Neotropical, Afrotropical, and Oriental regions. The subfamily includes economically important genera such as Epicauta (crop pests), Meloe (oil beetles), and Lytta. Members exhibit diverse life histories, with some species being phytophagous adults and others showing complex larval associations with bees or grasshoppers. Sexual dimorphism and stereotyped courtship behaviors have been documented in multiple genera.
Nemognatha sparsa
Nemognatha sparsa is a blister beetle in the family Meloidae, first described by LeConte in 1868. Like other members of its genus, it belongs to the subfamily Nemognathinae, which is characterized by elongated adult mouthparts adapted for feeding on flowers. The species is known from North America, with specimen records from museum collections in the western United States.
Nemognathinae
blister beetles
Nemognathinae is a subfamily of blister beetles (Meloidae) characterized by highly modified adult mouthparts, with elongated maxillae adapted for feeding on nectar from deep-corolla flowers. The subfamily contains approximately 8 genera and at least 80-120 described species globally, distributed across all continents except New Zealand, eastern Polynesian Islands, and Antarctica. Members exhibit diverse morphological adaptations including sexually dimorphic antennae in some taxa, abbreviated elytra, and reduced hind wings in certain genera. The subfamily is divided into five tribes: Nemognathini, Horiini, Cissitini, Leptopalpini, and Stenoriini.
Oedemeridae
false blister beetles, pollen-feeding beetles
Oedemeridae is a cosmopolitan family of beetles containing approximately 100 genera and 1,500 species. Adults are slender, soft-bodied beetles commonly found on flowers and foliage, where they feed primarily on pollen and nectar. Larvae develop in decaying wood or herbaceous plant stems, with most species being xylophagous. The family is notable for producing cantharidin, a toxic defensive compound also found in blister beetles (Meloidae), which makes adults chemically protected and often brightly colored with aposematic coloration.
Oxacis debilis
Oxacis debilis is a species of false blister beetle in the family Oedemeridae. The genus Oxacis is primarily Neotropical in distribution, with some species extending into the southern United States. Members of Oedemeridae are commonly known as false blister beetles due to their production of cantharidin, a defensive compound that can cause blistering on human skin. The specific epithet "debilis" (Latin for weak or feeble) may refer to morphological characteristics of the species.
Phodaga marmorata
Phodaga marmorata is a species of blister beetle in the family Meloidae, tribe Eupomphini. The species is characterized by its marbled or mottled coloration, as indicated by its specific epithet. It occurs in both Central and North America. Like other members of Meloidae, it possesses chemical defenses including cantharidin, a toxic compound that provides protection against predators.
Pleuropasta reticulata
Pleuropasta reticulata is a species of blister beetle in the family Meloidae, described by Van Dyke in 1947. The species is found in Central America and North America, with records from the southwestern United States and Mexico. As a member of the tribe Eupomphini, it belongs to a group of meloid beetles characterized by aposematic coloration and chemical defenses. The specific epithet 'reticulata' refers to a net-like or reticulated pattern, likely describing the elytral markings. Field observations indicate adults are active during warmer months and may be found in association with flowering plants.
Pseudozonitis schaefferi
Pseudozonitis schaefferi is a blister beetle in the family Meloidae, first described by Blatchley in 1922. It belongs to the subfamily Nemognathinae, a group characterized by elongated maxillary mouthparts adapted for nectar feeding on flowers. The genus Pseudozonitis comprises approximately 14 described species in North America, with P. schaefferi being one of the less commonly encountered members. Like other nemognathine blister beetles, adults are likely associated with flowers for feeding, while larvae are probably parasitoids or predators of bee eggs and provisions in nest cells.
Pyrota
Pyrota is a genus of blister beetles in the family Meloidae, comprising at least 30 described species. The genus is characterized by complex and highly distinctive courtship behavior involving prolonged physical contact between sexes. Males alternate between mounting above females for dorsal acts (palpation, dorsal antennation, rocking) and positioning behind them for posterior acts (leg grasp, palpal insertion beneath elytra, lifting female body, posterior antennation, abdominal curvature and stroke, genital hold). Adults exhibit little aggressive behavior and copulate in a linear position for extended periods with abdominal pumping by the male. Some species show extreme size dimorphism between mating individuals.
Pyrota bilineata
Pyrota bilineata is a blister beetle (family Meloidae) distributed across western North America. The species exhibits extreme sexual size dimorphism, with males frequently less than half the size of females. Adults are diurnal and commonly observed feeding and mating on flowers of yellow rabbitbrush (Chrysothamnus viscidiflorus) and related Asteraceae. Like other meloids, it produces cantharidin, a defensive compound that renders it unpalatable to predators.
Pyrota concinna
Pyrota concinna is a blister beetle in the family Meloidae, distributed across Central America and North America. The species has been observed visiting flowers of Isocoma pluriflora (southern goldenbush) in saltbush chaparral habitats in southeastern New Mexico. As a member of the tribe Pyrotini, it exhibits the typical blister beetle defensive chemistry and soft-bodied adult form characteristic of the family.