Identification & Distribution:
Macrosiphoniella oblonga is a distinctive rather elongated apple-green aphid with a darker green spinal stripe. The body hairs are not placed on dark scleroites. The antennae are mostly pale or dusky but with the apices of segments 3 and 4 darker, and segments 5 and 6 dark. The legs are long, thin and pale. The siphunculi are greenish with brownish tips; they are thinnest over the distal one third but broader towards the apex. The siphunculi are 1.0-1.4 times longer than the length of the cauda (cf. Macrosiphoniella artemisiae which has the siphunculi 0.6-0.9 times longer than the cauda). The cauda is green (cf. Macrosiphoniella artemisiae which has the cauda black). The body length of Macrosiphoniella oblonga is 3.0-5.1 mm.
The alate Macrosiphoniella oblonga is elongate bodied with the siphunculi longer than the cauda. The clarified slide mounts below are of adult viviparous female Macrosiphoniella oblonga : wingless, and winged.
Micrographs of clarified mounts by permission of Roger Blackman, copyright AWP all rights reserved.
The slender mugwort aphid can be found scattered on the undersides of the lower leaves of mugwort (Artemisia vulgaris) and cultivated chrysanthemum species. It does not form large colonies. Sexual forms can be found in autumn, and the species overwinters as eggs. The male is apterous and very slender. Macrosiphoniella oblonga occurs in Europe and much of north Asia.
Other aphids on same host:
- Macrosiphoniella oblonga has been recorded from 23 Artemisia species.
Blackman & Eastop list 73 species of aphid (including 28 Macrosiphoniella species) as feeding on mugwort (Artemisia vulgaris) worldwide, and provide formal identification keys.
Of those aphid species, Baker (2015) lists 25 as occurring in Britain:
- Macrosiphoniella oblonga has been recorded from 2 Chrysanthemum species (Chrysanthemum indicum, Chrysanthemum morifolium).
Blackman & Eastop list 30 species of aphid as feeding on "florists' chrysanthemums" (Chrysanthemum indicum & Chrysanthemum morifolium) worldwide, and provide formal identification keys.
Of those aphid species, Baker (2015) lists 24 as occurring in Britain:
Our particular thanks to Roger Blackman for images of his clarified slide mounts.
Whilst we make every effort to ensure that identifications are correct, we cannot absolutely warranty their accuracy. We have mostly made identifications from high resolution photos of living specimens, along with host plant identity. In the great majority of cases, identifications have been confirmed by microscopic examination of preserved specimens. We have used the keys and species accounts of Blackman & Eastop (1994) and Blackman & Eastop (2006) supplemented with Blackman (1974), Stroyan (1977), Stroyan (1984), Blackman & Eastop (1984), Heie (1980-1995), Dixon & Thieme (2007) and Blackman (2010). 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).
- Blackman, R.L. & Eastop, V. (2006). Aphids on the World's Herbaceous Plants and Shrubs. Vols 1 & 2. J. Wiley & Sons, Chichester, UK. Full text