Cardenolide-sequestration
Guides
Chrysochus
dogbane leaf beetles, milkweed beetles
Chrysochus is a genus of leaf beetles in the subfamily Eumolpinae, established in 1836 by Louis Alexandre Auguste Chevrolat. The genus name derives from Greek χρυσοχόος, meaning 'goldsmith,' referencing the striking metallic coloration of its members. The genus contains at least eight described species distributed across North America, Europe, and Asia, with six species in the Palearctic realm and two in North America. Species in this genus are specialized herbivores of plants in the dogbane and milkweed families (Apocynaceae and Asclepiadaceae).
Chrysochus auratus
Dogbane Leaf Beetle, Dogbane Beetle
Chrysochus auratus is a leaf beetle in the family Chrysomelidae, notable for its striking iridescent blue-green coloration with coppery or golden metallic highlights. This beetle is strictly associated with dogbane plants (Apocynum spp.), feeding on leaves as adults and roots as larvae. It has evolved specialized physiological and behavioral adaptations to overcome the toxic cardenolide defenses of its host plants, including a modified Na+/K+-ATPase enzyme that allows it to process and even sequester these compounds for its own chemical defense against predators.
Labidomera
milkweed leaf beetle
Labidomera is a genus of leaf beetles (Chrysomelidae) in the tribe Chrysomelini. The genus includes several species, with L. clivicollis being the most studied and widely distributed. Members are strongly associated with milkweed plants (Asclepias) and related genera. The genus exhibits unusual larval locomotion and participates in Müllerian mimicry rings with other orange-and-black milkweed insects.
Labidomera clivicollis
Swamp Milkweed Leaf Beetle, Milkweed Leaf Beetle
Labidomera clivicollis is a large leaf beetle specialized on milkweeds (Asclepias spp.). Adults and larvae feed on milkweed foliage, sequestering cardiac glycosides for chemical defense. The species exhibits aposematic orange and black coloration as part of a Müllerian mimicry complex with monarch butterflies and other milkweed feeders. Reproduction is photoperiodically controlled, with short day lengths inducing adult diapause. Larvae suffer high predation mortality, particularly from ground-dispersing predators.
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.
Tetraopes annulatus
Ringed Long-horned Beetle
Tetraopes annulatus is a species of longhorn beetle in the subfamily Lamiinae, described by John Lawrence LeConte in 1847. It is distributed across the northern United States and southern Canada, with records from Alberta, Manitoba, and Saskatchewan. Like other members of the genus Tetraopes, this species is a milkweed specialist, with larvae feeding on roots and adults feeding on foliage.
Tetraopes femoratus
Red-femured Milkweed Borer
Tetraopes femoratus is a longhorned beetle (family Cerambycidae) in the subfamily Lamiinae, described by John Lawrence LeConte in 1847. It is one of several North American milkweed borer beetles in the genus Tetraopes, all of which are specialized feeders on milkweeds (Asclepias spp.). The species occurs across western and central North America from Canada to Mexico, with records from the western United States and Great Plains region. Adults are typically encountered in late summer and fall, with September collecting records from Oklahoma and late August observations from sagebrush habitats in Nevada.
Tetraopes pilosus
Pilose Milkweed Beetle
Tetraopes pilosus is a longhorned beetle in the family Cerambycidae, described by Chemsak in 1963. It is a milkweed specialist restricted to Quaternary sandhills of the central and southern Great Plains. Adults are characterized by dense white pubescence and bright red-and-black aposematic coloration. The species is closely associated with sand milkweed (Asclepias arenaria), feeding on both foliage as adults and roots as larvae.