Woodland Ground Beetle
( Pterostichus sp. )


2011-0730-EB190131-COL00468-Pterostichus_sp[1411h46s,F,A,rock]{EXD}-G.jpg

PHOTO COMMENT

IDENTIFICATION
Identification:Pterostichus sp.
(Bonelli ,1810 )
Common Name:Woodland Ground Beetle
Life Stage:(A) adult

PHYLOGENY

Phylum:Arthropoda
Class:Insecta
Superorder:Holometabola
Order:Coleoptera
Suborder:Adephaga
Family:Carabidae
Subfamily:Harpalinae
Tribe:Pterostichini
Genus:Pterostichus
Taxon Code:COL00468
ITIS/TSN:110453

LOCATION DETAILS
Location Name
Del Valle Reservoir, Del Valle Reservoir, Del Valle Reservoir, Livermore
County:Alameda County
ECI Site#:CAEB190130
Open Space Location:Del Valle Reservoir

RECOGNITION
Recognition
BugGuide.net: "Mentum tooth emarginate at apex (except for honestus group); inner lobe of the maxilla prolonged into a heavily sclerotized, arched, inwardly directed tooth which appears hooked; terminal segment of all palpi cylindrical or fusiform; antennae pubescent from and including the fourth segment; prothorax with single or double laterobasal fovea and with two lateral setae; elytral epipleura crossed. Most species with abbreviated scutellar stria with an ocellate puncture at its base; first metatarsal segment usually with external furrow."
Description
This is a very common beetle in this area. It is the most common beetle seen beneath ground debris. Adult: Entirely jet black, except for the antenna, tibiae and palpi which are brown. Moderately elongate. Mouthparts: Well-developed mandibles. Palpi are long. The mentum (front and center) tooth of the lower labrum is emarginate (indented) at the front tip. The inner lobe of the maxilla is prolonged into a heavily sclerotized, arched, inwardly directed tooth which appears hooked. The terminal segment of all palpi are cylindrical or fusiform. Antennae: Long. Pubescent from, and including, the fourth segment. Thorax: Nearly as wide as the abdomen. Prothorax with single or double laterobasal fovea and with two lateral setae. Wings: Elytra have fine lines etched along the length. Elytral epipleura are crossed. Most species have abbreviated scutellar stria with an eye-like puncture at its base. Legs: First metatarsal segment usually with external furrow.
Diversity
Taxa occurring in the Bay Area include subgenus Hypherpes, and species P. vicinus and P. angustus. America, north of Mexico: 180 species in 23 subgenera. Eurasia: About 2,000 species.
Colors
Color1: black

BIOLOGY
Food
Predaceous on small invertebrates, but are known to also feed on strawberries.
Range
California, and across most of the United States and Canada. Distribution also includes Asia and neotropical regions.
Diversity
Taxa occurring in the Bay Area include subgenus Hypherpes, and species P. vicinus and P. angustus. America, north of Mexico: 180 species in 23 subgenera. Eurasia: About 2,000 species.

CREDITS
Photographer
Eddie Dunbar
Insect Sciences Museum of California

References
ITIS.
Pterostichus. (https://en.wikipedia.org/wiki/Pterostichus). Accessed September 25, 2016.


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