Pachybrachis othonus

Members of the genus Pachybrachis are distinguished from other case-bearing leaf beetles by their compact, oval body shape and relatively short antennae. Within the genus, P. othonus can be separated from congeners by examination of male genitalia and subtle differences in coloration and punctation patterns on the elytra. Accurate identification to species level typically requires dissection and comparison with reference specimens.

Found in association with leguminous host plants, particularly in open, sunny habitats including prairies, meadows, and woodland edges. The species occurs in mesquite-acacia scrub and oak-juniper woodlands in the southwestern United States.

Documented from North America, with records from the southwestern United States including Arizona and Texas. The species has been collected at light stations in mesquite-acacia scrub habitats in southeastern Arizona.

Adults have been collected in July in Arizona, suggesting peak activity during mid-summer months. Activity likely extends from late spring through early fall depending on local conditions.

• Prosopis glandulosa - hostmesquite
• Senegalia greggii - hostcat-claw acacia
• Quercus oblongifolia - hostMexican blue oak
• Mimosa dysocarpa - hostvelvetpod mimosa

Adults are attracted to ultraviolet and mercury-vapor lights at night. They are frequently collected by beating host vegetation, particularly leguminous trees and shrubs. The larvae construct portable cases from fecal material and exuviae, which they carry while feeding.

As a folivore, larvae and adults feed on living plant tissue of leguminous hosts, potentially influencing plant fitness through herbivory. The species serves as prey for various arthropod predators and parasitoids.

Minor agricultural pest potential on cultivated legumes, though not considered economically significant. Collected by entomologists for systematic and biodiversity studies.

• Pachybrachis spp.Other members of the genus share similar body form and case-bearing larval biology; require genitalic examination for definitive separation.
• Cryptocephalus spp.Related case-bearing leaf beetles in the same tribe, but generally differ in body proportions and antennal length.

• leaf beetle
• case-bearing beetle
• legume feeder
• Chrysomelidae
• Cryptocephalinae
• North America
• southwestern United States
• nocturnal
• light-attracted

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• Belostomatidae | Beetles In The Bush