Beetles of North Carolina
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Scientific Name: Common Name:
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View Carabidae Members:
Members of Trechus:
1 NC Records

Trechus thomasbarri Donabauer, 2005 - No Common Name


Taxonomy
Family: Carabidae Subfamily: Trechinae                                                             
Comments: One of 82 species in this genus that have been recorded in North America north of Mexico, 42 of which occur in North Carolina (Bosquet, 2012). Trechus thomasbarri belongs to subgenus Microtrechus and is included in the Nebulosus Species Group by Donabauer (2005b). In addition to thomasbarri, 21 other species are included in this group, 18 of which occur in North Carolina and the rest in Tennessee.
Species Status: The type locality is Haoe Lead in the Unicoi Mountains, Graham County, NC (Donabauer, 2005b). Donabauer named this species after Thomas Barr, whose work on Trechus in the Southern Applachians inspired his interest in this group
Identification
Field Guide Descriptions: Online Resources: BugGuide, Wikipedia, GBIF   iNaturalistTechnical Description, Adults/Nymphs: Donabauer (2005b)                                                              
Comments: "Distinguished from other species of the nebulosus-group by pale reddish colouration, small eyes, and prominently sharp basal angles of pronotum" (Donabauer, 2005b). Members of this genus generally show too little variation in pattern for standard photographs to be used to identify particular species.
Total Length [body plus wings; excludes ovipositor]: 4.1 mm (Donabauer, 2005b)
Structural Features: As a member of subgenus Microtrechus, only the first segment of front tarsus is enlarged in males. This species is distinguished from other members of its species group morphometrically and by features of the aedeagus (Donabauer, 2005b).
Distribution in North Carolina
County Map: Clicking on a county returns the records for the species in that county.
Flight Dates:
 High Mountains (HM) ≥
 4,000 ft.
 Low Mountains (LM) <
 4,000 ft.
 Piedmont (Pd)
 Coastal Plain (CP)
Click on graph to enlarge
Habitats and Life History
Habitats: The summit of Haoe Lead is about 4,560' and is covered with hardwood forest
See also Habitat Account for General High Elevation Forests
Diet: Predatory on small insects and other invertebrates
Observation Methods:
Abundance/Frequency: Donabauer (2005b) found only a single specimen, the type for this species
Adult Phenology:
Status in North Carolina
Natural Heritage Program Status: [SR]
Natural Heritage Program Ranks: GNR [S1]
State Protection:
Comments: This species is known from just a single specimen. Like other members of this genus, its highly restricted range and occurrence on a high elevation ridgetop makes it highly vulnerable to the warming and drying impacts of climate change.