Darkling Beetle
( Coelocnemis sp. )


2011-0530-EB380001-COL00461-Coelocnemis_sp[1303h26s,F,A,fwdlaterum]{EXD}-G.jpg

PHOTO COMMENT

IDENTIFICATION
Identification:Coelocnemis sp.
(Mannerheim ,1843 )
Common Name:Darkling Beetle
Life Stage:(A) adult

PHYLOGENY

Phylum:Arthropoda
Class:Insecta
Superorder:Holometabola
Order:Coleoptera
Suborder:Polyphaga
Family:Tenebrionidae
Subfamily:Stenochiinae
Tribe:Cnodalonini
Genus:Coelocnemis
Taxon Code:COL00461

LOCATION DETAILS
Location Name
Morgan Territory, Morgan Territory, Morgan Territory, Clayton
County:Contra Costa County
ECI Site#:CAEB380000
Open Space Location:Morgan Territory

RECOGNITION
Recognition
BugGuide.net: "Coelocnemis, like Eleodes, stand on their heads and emit defensive secretions from the tip of their abdomen, but are readily distinguished from Eleodes by having two rows of fine, golden brown hairs on the lower half of the inside margin of the hind tibiae."
Description
Coelocnemis, like Eleodes, stand on their heads and emit defensive secretions from the tip of their abdomen, but are readily distinguished from Eleodes by having two rows of fine, golden brown hairs on the lower half of the inside margin of the hind tibiae.
Body Length
Males: ~16 mm. Females: ~20 mm.
Diversity
7 Species in North America.
Child Taxa
Coelocnemis californica Mannerheim, 1843; Coelocnemis lucia Doyen, 1973 Doyen, 1973; Coelocnemis magna LeConte, 1851 LeConte, 1851; Coelocnemis obesa LeConte, 1851 LeConte, 1851; Coelocnemis punctata LeConte, 1855 LeConte, 1855; Coelocnemis rugulosa Doyen, 1973 Doyen, 1973; Coelocnemis sulcata Casey, 1895 Casey, 1895
Similar Taxa
Eleodes sp. also are large, black beetles in arid habitats. Both have similar defensive behaviors.
Colors
Color1: black

BIOLOGY
Food
Vegetative matter.
Habitat
May be seen walking in open ground and is common beneath ground debris in woodlands and meadows.
Diversity
7 Species in North America.
Active Period
Adults are active year round.

CREDITS
Photographer
Eddie Dunbar
Insect Sciences Museum of California

References
Genus Coelocnemis. (http://bugguide.net/node/view/50466). Accessed March 12, 2016. .
Slobodchikoff, C. N.. (1978). Experimental Studies of Tenebrionid Beetle Predation by Skunks. Behaviour, 66(3/4), 313–322. Retrieved from http://www.jstor.org/stable/4533916


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