Pachybrachis brevicollis

J.L.LeConte, 1880

Pachybrachis brevicollis is a case-bearing leaf beetle in the Chrysomelidae, first described by John Lawrence LeConte in 1880. It belongs to the Cryptocephalinae, a group known for larvae that construct protective cases from their own excrement and shed skins. The is distributed across North America, with records from the southwestern United States including Arizona.

Pronunciation

How to pronounce Pachybrachis brevicollis: /ˌpækɪˈbrækɪs ˌbrɛvɪˈkɒlɪs/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

As a member of Pachybrachis, this can be distinguished from other chrysomelid genera by the combination of a compact body form, short , and typically patterned . Within the genus, P. brevicollis is characterized by its relatively short pronotum (the species epithet 'brevicollis' refers to this 'short neck' condition). Accurate identification to species level within Pachybrachis generally requires examination of male genitalia and comparison with or authoritative keys.

Habitat

Based on collection records from southeastern Arizona, this occurs in oak-juniper woodland and associated riparian corridors. Specimens have been collected at ultraviolet and mercury-vapor light stations in mesquite-acacia scrub and oak woodland .

Distribution

North America. Documented from the southwestern United States, specifically Arizona. The GBIF database confirms presence in North America.

Seasonality

activity has been recorded in late July in southeastern Arizona, suggesting summer and activity. This timing aligns with the monsoon season in the region.

Behavior

are attracted to ultraviolet and mercury-vapor light sources, a common among many chrysomelid beetles. This activity pattern facilitates collection and observation.

Similar Taxa

Other Pachybrachis speciesThe Pachybrachis contains numerous , many of which are externally similar and require dissection of male genitalia for definitive identification. P. brevicollis is distinguished by its short pronotal characteristics.
Cryptocephalus speciesMembers of the related Cryptocephalus also belong to Cryptocephalinae and share the case-bearing larval habit. can be distinguished by differences in antennal structure and body proportions, with Cryptocephalus typically having longer relative to body size.

More Details

Taxonomic authority

The was described by John Lawrence LeConte (1825-1883), the preeminent American coleopterist of the 19th century, who described thousands of North American species.

Light trapping records

A series of specimens was collected at light stations in the Santa Rita Mountains of Arizona, indicating this responds to both ultraviolet and mercury-vapor light sources.