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Aphidinae : Uroleucon anomalae
 

 

Uroleucon anomalae

New England aster aphid

On this page: Identification & Distribution Other aphids on the same host

Identification & Distribution

Adult Uroleucon anomalae apterae (see first picture below of aphid giving birth) are pale green to yellow-green. Antennal segment III bears 28-46 secondary rhinaria. The apical rostral segment (R IV+V) is 1.4-1.85 times as long as the second hind tarsal segment (HT II), and bears more than 14 accessory hairs (cf. Uroleucon erigeronense, usually on Erigeron, which has RIV+V less than 1.4 times the length of HT II). Dorsal abdominal tubercles are absent. The coxae are pale, as are the trochanters and basal halves of the femora. The tibiae are mainly light brown (cf. Uroleucon paucosensoriatum in eastern USA and Canada, which has entirely dark tibiae). The siphunculi are dark apically, but pale basally (cf. Uroleucon astronomus in eastern USA and Canada, mainly found on Eurybia macrophylla, which has the siphunculi uniformly pigmented, as does Uroleucon paucosensoriatum). The siphunculi are 0.21-0.55 times the body length and 1.1-1.4 times the length of the (pale) cauda. The body length of adult Uroleucon anomalae apterae is about 1.9-2.0 mm.

First images above by permission, copyright Claude Pilon, all rights reserved;
Second image above copyright CBG Photography Group under a Creative Commons Zero (CC0) license.

Immature Uroleucon anomalae (see picture below) are also pale green, but with pale siphunculi and a distinct orange hue on the head and between their siphunculi. The alate (not pictured) has a light green, head, thorax, abdomen and cauda; the siphunculi are dark apart from near the base. Antennal segment III bears 35-51 secondary rhinaria.

Images above by permission, copyright Claude Pilon, all rights reserved.

Uroleucon anomalae feeds on the flower stems of the New England aster (Symphyotrichum novae-angliae, see picture above). Moran (1985) notes that this aphid species is apparently restricted to this glandular-hirsute Aster species and possesses a correspondingly elongated apical rostral segment (at about 1.5 times length of its second hind tarsal segment). Uroleucon leontodontis in Europe has a similar elongated apical rostral segment for feeding on the glandular-hirsute rough hawkbit ( Leontodon hispidus). Uroleucon anomalae is distributed through the eastern USA into Canada.

 

Other aphids on the same host

Blackman & Eastop list 9 species of aphid as feeding on New England aster (Symphyotrichum novae-angliae) worldwide, and provide formal identification keys (Show World list). Of those aphid species, Baker (2015) lists 4 as occurring in Britain (Show British list).

Acknowledgements

We are especially grateful to Claude Pilon for pictures of Uroleucon anomalae (for more of her excellent pictures see).

Identification of specimens photographed by Claude Pilon was confirmed by Eric Maw by microscopic examination and DNA analysis of preserved specimens. For taxonomic details we have used the keys and species accounts of Hottes & Frison (1931) and Moran (1985) together with Blackman & Eastop (1994) and Blackman & Eastop (2006). We fully acknowledge these authors as the source for the (summarized) taxonomic information we have presented. Any errors in identification or information are ours alone, and we would be very grateful for any corrections. For assistance on the terms used for aphid morphology we suggest the figure provided by Blackman & Eastop (2006).

Useful weblinks

References

  • Hottes, F.C. & Frison, T.H. (1931). The Plant Lice, or Aphiidae, of Illinois. Illinois Natural History Survey Bulletin 19(3), 123-447. Full text

  • Moran, N. (1985). The genus Uroleucon (Homoptera: Aphididae) in Michigan: Key, host records, biological notes, and descriptions of three new species. Journal of the Kansas Entomological Society 57(4), 596-616. Full text