Diet

• Adults and nymphs: Primarily feed on seeds of milkweed-family plants (Apocynaceae, especially Asclepias), using their piercing-sucking mouthparts to extract nutrients from developing and mature seeds.

• They may also feed on sap from stems and other plant tissues, but seeds appear to be particularly important for development and reproduction.

• Like other Oncopeltus, it can occur in dense groups on its host plants, particularly during the nymphal stages.

Range

• Oncopeltus guttaloides is a seed bug (Family Lygaeidae) in the Subfamily Lygaeinae and Genus Oncopeltus.

• Its known distribution extends through the southern United States, Mexico, Central America and the Caribbean, including Cuba, Guatemala, Honduras, Jamaica and the Dominican Republic.

• Around Zihua, it would be considered occasional to locally common, particularly where milkweed and other suitable host plants are abundant. Its documented occurrence in Guerrero and along the Pacific coast of Mexico supports its presence in the region.

Habitat

• Usually associated with open, sunny habitats containing milkweed and other suitable host plants.

• Typical habitats include tropical dry forest margins, scrub, grassland, roadsides, disturbed areas, gardens and agricultural margins.

• The species can be particularly conspicuous where Asclepias plants are producing flowers, fruits and seeds.

• Nymphs may form large aggregations on the host plant, making colonies much easier to detect than individual adults.

Size

• Oncopeltus guttaloides is a medium-sized seed bug, with the elongated body typical of Lygaeinae.

• Adults are generally around 10–12 mm long, although size varies somewhat among individuals.

• The body is predominantly dark with contrasting reddish-orange markings, characteristic of many Oncopeltus.

• The bold colouration likely provides warning coloration, as members of the genus can acquire defensive compounds from their milkweed hosts.