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Xanthogaleruca
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Elm Leaf Beetle (Xanthogaleruca luteola)
Photo#1608290
Copyright © 2018
Ken Sproule
Beetle -
Xanthogaleruca luteola
Toronto, High Park, Ontario, Canada
July 31, 2018
Size: ~ 8 mm
Can this be identified further? Thank you.
Contributed by
Ken Sproule
on 1 November, 2018 - 12:39am
Last updated 13 November, 2018 - 2:46am
Moved
Moved from
Trirhabda
.
…
Aaron Schusteff
, 13 November, 2018 - 2:46am
Do you have any idea of the host plant?
My initial thought was
T. convergens
...though the pronotal spots seem too small (and the narrowly elongate medial one is peculiar...a virtual "exclamation point"!).
…
Aaron Schusteff
, 11 November, 2018 - 11:11pm
Unfortunately I have no idea
Unfortunately I have no idea of the host plant. The setup was in the woods but there are fields and gardens near by. It could be many things.
Is there any chance it could be an Elm Leaf Beetle?
…
Ken Sproule
, 12 November, 2018 - 10:52pm
Yes, fits characters for dark form of Elm Leaf Beetle
See ID comments from the BugGuide info page for
Xanthogaleruca luteola
here
. Note the dark spot above the antennae (barely visible); the two (somewhat subtle) short dark medial vitta at the base of each elytron; and the "pinched" medial spot on the pronotum.
This is definitely not
Trirhabda
, since in that genus the 3rd antennomere (= antennal segment) is
shorter
than the 4th...whereas in your photo the 3rd antennomere is
longer
than the 4th (see discussion
here
).
PS: These, like so many other taxa, can be tricky! In the future, please only place posts at the level where you're
certain
of the ID...else errors can go unnoticed for a long time, and potentially mislead folks. Better to err on placing things with certainty at a higher rank (i.e. Coleoptera or Chrysomelidae) than at a possibly lower erroneous rank (like
Trirhabda
here). It may take a while, but usually posts will eventually work there way to the best level that all of us can collectively figure out ;-)
…
Aaron Schusteff
, 13 November, 2018 - 2:42am