Colliuris pensylvanica

(Linnaeus, 1758)

Long-necked Ground Beetle

Colliuris pensylvanica is a small ground beetle in the Carabidae, tribe Odacanthini, commonly known as the long-necked ground beetle. measure 5.8–7.2 mm in length. The has undergone extensive taxonomic revision, with multiple historical names now synonymized under the current valid name. It occurs across a broad geographic range in North America and the Caribbean.

Colliuris pensylvanica (Linnaeus) portrait by Michael K. Oliver, Ph.D.. Used under a CC BY-SA 4.0 license.

Colliuris pensylvanica (Linnaeus) landscape by Michael K. Oliver, Ph.D.. Used under a CC BY-SA 4.0 license.

Carabidae- Colliuris pensylvanica (Long-necked Ground Beetle) by Kristof Zyskowski & Yulia Bereshpolova. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Colliuris pensylvanica: /kɔlˈljʊrɪs pɛnsɪlˈvænɪkə/

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Identification

Distinguished from other ground beetles by the combination of small size (5.8–7.2 mm), elongated prothorax creating a long-necked appearance, and placement in tribe Odacanthini. The can be separated from other Colliuris species using the key provided in the taxonomic review of Nearctic and Mexican species. Historical confusion with C. picta and related names has been resolved through synonymy.

Images

Appearance

are slender, elongated beetles measuring 5.8–7.2 mm in length. The "long-necked" refers to the elongated prothorax, which gives the a distinctive narrow "neck" region behind the . Body form is characteristic of the tribe Odacanthini, with long legs and thread-like typical of ground beetles.

Habitat

Mainly inhabits open places. Sensitive to soil management techniques such as strip tillage and plasticulture in agricultural settings. As a member of the carabid , it shows preference for less disturbed soil conditions compared to conventional tillage systems.

Distribution

Recorded from Canada, United States of America, Mexico, Cuba, and the Lesser Antilles. The has one of the broadest distributions in the across the Nearctic region and Caribbean islands.

Ecological Role

Member of ground beetle (Carabidae) that serve as bioindicators of soil management effects on beneficial insect diversity. The is sensitive to agricultural disturbance regimes, with better preserved under strip tillage compared to plasticulture.

Human Relevance

Studied as part of beneficial ground beetle in agricultural research. Its sensitivity to farming practices makes it relevant for assessing impacts of soil management on biodiversity in horticultural and crop systems.

Similar Taxa

Colliuris subdistinctaHistorically confused due to similar ; distinguished by taxonomic characters detailed in -level keys
Colliuris picta (historical name)Now synonymized under C. pensylvanica; previous use of this name contributed to taxonomic confusion

More Details

Taxonomic History

The has a complex taxonomic history with multiple synonymies proposed in 2010. Formerly recognized names including Casnonia picta, Casnonia limbata, and three varieties of Colliuris picta are now treated as synonyms of C. pensylvanica. The species was originally described by Linnaeus in 1767 (or 1758 per GBIF).

Agricultural Sensitivity

Research on farming practices in squash and gourd fields found C. pensylvanica to be sensitive to soil management techniques, with strip tillage being less disruptive to than plasticulture production. This indicates the may be a useful indicator of soil disturbance in agricultural .