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Macrosiphum tinctum

Green willowherb aphid

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

Identification & Distribution:

Macrosiphum tinctum apterae are mid to blue green with a darker spinal stripe (see first picture below), or less commonly pink-red (see second picture below). The antennal terminal process is.6-7.1 times the base of the sixth antennal segment. The fused last two segments of the rostrum (RIV+V) are 0.98-1.1 times longer than the second segment of the hind tarsus (cf. Macrosiphum euphorbiae in which (RIV+V) are 0.83-1.02 times longer than the second segment of the hind tarsus). The femora of Macrosiphum tinctum are entirely pale. The dark apical sections of the tibiae are usually markedly swollen to 1.5 or more times their least diameter (cf. Macrosiphum euphorbiae which does not have the apical sections of the tibiae so swollen). The siphunculi are dusky at their apices and are 0.30-0.37 times the body length.

The alate viviparous female (not pictured) has a green (or rarely red) abdomen and, as with the aptera, the dark apical sections of the tibiae are often markedly swollen.

The clarified slide mounts below are of adult viviparous female Macrosiphum tinctum : wingless, and winged.

Micrographs of clarified mounts by permission of Roger Blackman, copyright AWP all rights reserved.

The green willowherb aphid does not host alternate. Macrosiphum tinctum is found on willowherbs (Epilobium species), mainly Epilobium angustifolium (rosebay willowherb) and Epilobium montanum (broad-leaved willowherb).

 

Other aphids on same host:

Macrosiphum tinctum has been recorded from 8 Epilobium species.

Acknowledgements

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).

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