Oncideres quercus

Skinner, 1905

Arizona Oak Girdler

Oncideres quercus is a longhorned beetle in the Cerambycidae, described by Skinner in 1905. It occurs in Mexico and the southwestern United States. As a member of the Oncideres, it likely exhibits the characteristic twig-girdling typical of this group, where females chew girdles around twigs of trees before laying in the dying portions.

Oncideres quercus by (c) jimeckert49, some rights reserved (CC BY). Used under a CC-BY license.

Oncideres quercus by (c) Laura Gaudette, some rights reserved (CC BY), uploaded by Laura Gaudette. Used under a CC-BY license.

Pronunciation

How to pronounce Oncideres quercus: /ˌɒnˈsɪdəˌriːz ˈkwɜːrkəs/

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Identification

Members of Oncideres are distinguished from similar cerambycids by their twig-girdling and association with dying or dead twigs on trees. O. quercus specifically can be distinguished from the more widespread O. cingulata (twig girdler) by geographic range—O. quercus occurs in the southwestern United States and Mexico, while O. cingulata is found in eastern and central North America. Specific morphological distinctions between Oncideres require examination of antennal length, pronotal shape, and elytral patterning, but detailed diagnostic characters for O. quercus are not readily available in the provided sources.

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Habitat

Associated with oak woodlands and forests, given the epithet "quercus" and the typical relationships of Oncideres species. The species occurs in arid and semi-arid regions of the southwestern United States and adjacent Mexico.

Distribution

Mexico and the United States (southwestern region, including Arizona).

Host Associations

Quercus - -level association inferred from epithet; specific oak species not documented in provided sources.

Life Cycle

As with other Oncideres , the likely involves: laid in dying twigs that have been girdled by the female; larval development within the twig, consuming the wood; within the twig; and . However, specific details for O. quercus are not documented in the provided sources.

Behavior

females likely exhibit twig-girdling , chewing a complete or partial girdle around twigs to cause the portion to die, then laying in the dying wood. This behavior has been well-documented in congeneric such as O. cingulata but specific observations for O. quercus are not provided in the available sources.

Similar Taxa

Oncideres cingulataSimilar twig-girdling and , but O. cingulata occurs in eastern and central North America rather than the Southwest.
Oncideres rhodostictaAnother southwestern Oncideres ; distinguished by distribution and likely associations.

More Details

Taxonomic history

Described by Skinner in 1905. The has received limited study compared to the more widespread O. cingulata.