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Crossidius discoideus
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Crossidius discoideus sayi
Photo#139262
Copyright © 2007
Anthony Magee
longhorn -
Crossidius discoideus
Peyton, El Paso County, Colorado, USA
August 18, 2007
Size: 15 mm
Is this a Milkweed Longhorn?
Images of this individual:
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Contributed by
Anthony Magee
on 24 August, 2007 - 12:11am
Last updated 27 June, 2017 - 12:48pm
Moved
Moved from
Crossidius discoideus
.
…
v belov
, 27 June, 2017 - 12:49pm
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Crossidius discoideus sayi Casey 1912
*
…
Bruce Tilden
, 30 September, 2016 - 2:06pm
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Moved
Moved from
Crossidius
.
…
Phillip Harpootlian
, 27 August, 2007 - 10:56am
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On milkweed?
I am curious, did you find it on a milkweed plant?
I lightened the image a little so the details can be seen better.
…
Beatriz Moisset
, 24 August, 2007 - 7:26am
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Found it on...
Composita. Along with many other beetles.
…
Anthony Magee
, 24 August, 2007 - 10:33am
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The species...
...feeds on Gutierrezia and Haplopappus (Asteraceae) - larvae bore in the root crown while adults are found on the flowers and foliage.
…
Ted C. MacRae
, 28 August, 2007 - 9:35am
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Longhorn , yes
Not a milkweed species tho, my guess is this is something in the genus
Crossidius
…
Guy A. Hanley
, 24 August, 2007 - 12:40am
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Thanks Guy,
In fact it may be
Crossidius pulchellus
.
Harvard image reference
here
. I noticed that the pronotum coloration is different though.
…
Anthony Magee
, 24 August, 2007 - 1:06am
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not pulchellus
Its definitely not
pulchellus
. My initial thought was possibly some subspecies of
C. coralinus
. This species is quite polymorphic (occurs in many different patterns) depending on the population location.
…
Guy A. Hanley
, 24 August, 2007 - 8:41am
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I agree
Tom Murray has one on his site that is
similar
.
…
Anthony Magee
, 24 August, 2007 - 10:36am
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I believe this is...
Crossidius discoideus. Populations in east-central Colorado would be assignable to subspecies
sayi
, which occurs from western Kansas through the southern Rocky Mountain region.
…
Ted C. MacRae
, 27 August, 2007 - 9:53am
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Another voice for subspecies sayi
Beyond locality here, the black maculation on the pronotum is also consistent with subspecies
sayi
, and inconsistent with the other two subspecies.
That's according to the literature...from 100+ years ago. I was studying this today, and edited the
C. discoideus
info page
to reflect what I learned. But it would be nice to to have my interpretation of the literature checked by someone who's familiar with possible developments in the taxonomy of the group in the last century, and who could correct or confirm my edits to the info page earlier today!
…
Aaron Schusteff
, 30 August, 2015 - 7:49pm
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Ya
I guess I stepped in it there, now that I have my keys in front of me that makes more sense with the pronotal maculations, My specimen of
discoideus
I have in my collection does not show that much marking.
…
Guy A. Hanley
, 27 August, 2007 - 10:40am
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I appreciate...
All the fine work you guys (no pun intended) have done.
…
Anthony Magee
, 27 August, 2007 - 10:47am
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