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Pleotrichophorus gnaphalodes
Photo#1488618
Copyright © 2018
glmory
Aphid on Artemisia douglasiana -
Pleotrichophorus gnaphalodes
Cleveland National Forest, Riverside County, California, USA
January 24, 2018
Size: 1.7mm
https://www.inaturalist.org/observations/9665581
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Contributed by
glmory
on 30 January, 2018 - 9:58pm
Last updated 31 January, 2018 - 11:24am
Moved
Moved from
Aphids
.
…
Natalie Hernandez
, 31 January, 2018 - 11:24am
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Moved
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…
Ken Wolgemuth
, 30 January, 2018 - 10:13pm
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Pleotrichophorus gnaphalodes
http://www.aphidsonworldsplants.info/C_HOSTS_Art_Asp.htm#Artemisia
1. Tubercles don't seem very developed but they are more so than say on Aphis. Pretty sure I go to 2.
2. Lacks polygonal reticulation, key C.
http://www.aphidsonworldsplants.info/C_HOSTS_Art_Asp.htm#KEYC
1. Siphunculi tubular and longer than wide as is cauda, 12.
12. Dorsal hairs with fan shaped apices, 13.
13. Siphunculi/cauda = 1, I see two secondary rhinaria on antenna III, 14.
14. Siphunculi/cauda=1, 19.
19. Siphunculi pale, 23.
23. A few hairs ambiguous, but appears hairs are more fan like, so 27.
27. Siphunculi/cauda = 1, 28.
28. Hairs on antenna very short, hairs on head look like h-k in the figure, 29.
29. Hard one, but I think it is 30. It does seem to be long and thin near the tip, but it is sort of tapering for the whole length, 30.
30. Siphunculi/cauda= 1, 5 cauda hairs, RIV+V = 0.113mm, R IV + V/ HT II =1.1, 31.
31. Back of head and pale appendages probably mean Pleotrichophorus gnaphalodes
…
glmory
, 30 January, 2018 - 10:03pm
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Nice!
I think you are correct. #29 definitely goes to 30. There isn't a good comparison image in that figure, but I have "A revision of North American
Capitophorus
Van der Goot and
Pleotrichophorus
Börner (Homoptera:Aphididae)" by Leonila Alzate Corpuz-Raros and Edwin F Cook from the Smithsonian Contributions to Zoology (Number 156). It's available from the Smithsonian website if you're interested, if you google even just "A revision of North American Capitophorus" the PDF is the first thing to pop up.
I looked at the two pages of URS illustrations (Pg 120). If you took 29 to 32, and look at the illustrations for those two species, they look like normal URS you'd see in other genera, not this stiletto shape on the specimen you have here, and I agree with how you keyed it out. I also double checked the images of P. gnaphalodes on page 140 and seems to match.
…
Natalie Hernandez
, 31 January, 2018 - 11:17am
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