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

Trechus rosenbergi Barr, 1962 - 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 rosenbergi belongs to subgenus Microtrechus and is included in the Nebulosus Species Group by Bosquet (2012). In addition to rosenbergi, 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 Waterrock Knob in the Plott Balsam Mountains (Barr, 1962)
Identification
Field Guide Descriptions: Online Resources: BugGuide, Wikipedia, GBIF   iNaturalistTechnical Description, Adults/Nymphs: Barr (1962)                                                              
Comments: "Form unusually large, robust, convex; blackish-piceous, shining" (Barr, 1962). 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]: 4.5-5.0 mm, mean 4.7 (Barr, 1962)
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 (Barr, 1962, 1979).
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: Both sites where this species has been recorded are over 6,000' and support stands of Spruce-fir Forest
See also Habitat Account for Spruce-Fir Forests
Diet: Predatory on small insects and other invertebrates
Observation Methods:
Abundance/Frequency:
Adult Phenology: Not enough information exists for this species to determine its phenology
Status in North Carolina
Natural Heritage Program Status: [SR]
Natural Heritage Program Ranks: GH [S1]
State Protection:
Comments: Only known from the two locations where it was originally found (Barr, 1962; Donabauer, 2005b; Bosquet, 2012). Although NatureServe (accessed 2021-01-0) considers this species to be possibly extinct, it was recorded at the type locality in 2004 by Donabauer (2005b). NOnetheless, with only two highly isolated populations, both at extremely high elevations, this species is probably highly vulnerable to the warming and drying impacts of climate change and to the other factors that are degrading and opening up the canopy of the Spruce-fir Forests upon which it depends for its microclimate.