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Stenodynerus
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Stenodynerus blandus
Photo#1170188
Copyright © 2015
Joe
Parancistrocerus -
Stenodynerus blandus
-
Turnbull NWR, Spokane County, Washington, USA
September 23, 2008
Size: 8 mm
Images of this individual:
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Contributed by
Joe
on 1 December, 2015 - 1:32am
Last updated 15 December, 2015 - 2:57pm
Stenodynerus blandus
Moved from
anormis-group
. This species has the terminal segment of the male antenna entirely black (mostly light-coloured in blandoides).
…
Matthias Buck
, 15 December, 2015 - 2:57pm
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Stenodynerus blandus or blandoides, male
Note truncate apical edge of clypeus, which is distinctive for the anormis species group.
…
Matthias Buck
, 2 December, 2015 - 8:52pm
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Moved
Moved from
Parancistrocerus
.
…
Matthias Buck
, 2 December, 2015 - 8:50pm
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According to Carpenter 2004...
...this really does key to
Parancistrocerus
Bequeart based on couplet 11 in Carpenter 2004
(
1
)
, which separates the 2 genera based on basal sculpturing of tergum II: (
tergum II smooth basally in
Parancistrocerus
rather than ridged basally as in
Stenodynerus
de Saussure). Is there another source that you are referring to for separating these genera? I notice that the literature referred to in
Identification Atlas of the Vespidae (Hymenoptera, Aculeata) of the Northeastern Nearctic Region
referred to
is old, and perhaps outdated. I also notice that this key doesn't really provide any clear distinguishing marker for these 2 groups, and that the species key ID's them as one group.
…
Joe
, 14 December, 2015 - 7:55pm
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Stenodynerus
The sculpturing at the base of T2 can be difficult to assess. The images you posted here don't really show this. There are also those species of Stenodynerus in which the base of T2 is almost completely smooth (e.g. S. krombeini, see
http://cjai.biologicalsurvey.ca/bmc_05/bmc05images/keys/b7-41_42.jpg
). this is the reason why I decided to take a different approach in my key in the Vespid Atlas. It is sometimes easier to get to a species than to accurately identify the genus first. The wasp you have here is either S. blandus or S. blandoides, which have a dictinctive clypeus and antennal hook. There is no species of Parancistrocerus with a truncate apical clypeal margin (it is always more or less emarginate, e.g.:
http://cjai.biologicalsurvey.ca/bmc_05/bmc05images/species/c47-3.jpg
). Later today I should be able to get you a species name for this wasp.
As for the base of T2 it should be distinctively sulptured in this wasp. This should be easier to see in dorsal view than in lateral view, e.g.
http://cjai.biologicalsurvey.ca/bmc_05/bmc05images/keys/b7-14_16.jpg
.
…
Matthias Buck
, 15 December, 2015 - 8:30am
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