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Bitoma crenata
Photo#16722
Copyright © 2005
tom murray
red and black beetle -
Bitoma crenata
Harvard, Worcester County, Massachusetts, USA
April 30, 2005
Size: ~3mm
Is this a bark beetle or something similar? Found under tight bark.
Images of this individual:
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Contributed by
tom murray
on 8 May, 2005 - 12:06pm
Last updated 21 July, 2006 - 3:04pm
Bitoma crenata
This one is clearly B. crenata. Tom's long-ago query as to how to separate B. crenata and B. quadriguttata finally led to something.
B. crenata - ninth segment of antennae clearly wider than eighth (a larger species, 2.6-3.5 mm)
B. quadriguttata - eighth and ninth segments about same width (a smaller species, 1.7-2.8 mm). Both species are present in our collection, and they are easy to tell apart.
In Karl Stephan's revision (1989) he comments that B. quadriguttata is extremely common and ranges from New Hampshire to Florida and Texas. B. crenata was introduced from Europe and was spreading from southern Ontario and western New York. To my great surprise, ALL of our specimens in the UNH are B. crenata, and we have absolutely NO B. quadriguttata. Either they have been competitively replaced, or some/all of Karl's New England records are wrong. Karl was a very careful worker, so I'm not quite sure what the story is.
…
Donald S. Chandler
, 21 July, 2006 - 9:35am
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Now that I know the difference
I'll keep my eyes peeled (loupe assisted) for a quadriguttata.
…
Jim McClarin
, 22 July, 2006 - 10:14pm
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Cylindrical bark beetle?
The ridges on the pronotum (top of thorax) suggest the family Colydiidae to me. Nice image that should eventually lead to a genus.
…
Eric R. Eaton
, 10 May, 2005 - 2:24pm
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Bitoma
Colydiidae sounds good, Eric. Check out the images of
Bitoma crenata
here
- it looks just about right to me. According to the checklist
here
only two species of
Bitoma
occur in Ontario (see my previous comment - it looks like this is the same species I photographed), and one of them is
B. crenata
(introduced). These look close enough to be the right genus, at least.
…
Joel Kits
, 10 May, 2005 - 4:19pm
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Similar to mine
This look pretty similar to one I just submitted
(
1
)
. Hopefully we can get an ID for these.
…
Joel Kits
, 8 May, 2005 - 5:17pm
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