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Photo#1474732
Aphis on Bidens2 - Aphis gossypii

Aphis on Bidens2 - Aphis gossypii
Los Angeles, Los Angeles County, California, USA
November 24, 2017
Size: 1.35mm
Host: Bidens pilosa
Duplicate of https://www.inaturalist.org/observations/9065516

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Aphis on Bidens2 - Aphis gossypii Aphis on Bidens2 - Aphis gossypii Aphis on Bidens2 - Aphis gossypii

Moved
Moved from Aphids.

Moved
Moved from Cotton Aphid.

Moved
Moved from ID Request.

Aphis gossypii
Here is the logic which got me to Aphis gossypii.

http://www.aphidsonworldsplants.info/C_HOSTS_Bet_Byt.htm#Bidens

1. PT/base 2.9, 10

10. Tubercles weak, 11
11. Not Brachycaudus helichrysi, 12
12. Siphunculi/ body length 0.12, antenna doesn’t match Aphis coreopsidis
13. Siphunculi dark, on to polyphagous aphids key
http://www.aphidsonworldsplants.info/Polyphagous_II.htm
1. Siphunculi present, 4.

4. Tubercles undeveloped, no spicules, 15.

15. Cauda longer than wide, 16
16. Tubercles little developed, 22.

22. Siphunculi tapering, 24.

24. No solid black sclerite, 25
25. Stridulatory apparatus not present, 28.

28. Siphunculi/ body length = 0.12, PT/base=2.9, PT/ R IV + V =2, 29
29. Cauda longer than wide, 30.
30. Siphunculi dark, 31
31. Hind tibia pale, siphunculi/ cauda =2.1, R IV + V / HT II= 1.4, 32
32. 5 cauda hairs, ect. Aphis gossypii.