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Uroleucon sonchi

Large sowthistle aphid

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

Identification & Distribution:

Uroleucon sonchi is a large smooth dark brownish aphid with a glossy shine. Dorsal scleroites on abdominal tergites 1-5 are either absent, or very small (cf. many other Uroleucon species,  including Uroleucon cichorii which have dorsal hairs arising from dark scleroites). A crescent shaped sclerite is present in front of each siphunculus. The siphunculi are less than twice as long as the cauda. The Uroleucon sonchi coxae are dark.

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

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

The large sowthistle aphid lives on sowthistle (Sonchus spp.) especially common sowthistle (Sonchus oleraceus) and prickly sowthistle (Sonchus asper).

 

Other aphids on same host:

Acknowledgements

Our particular thanks to Roger Blackman for images of his clarified slide mounts.

We have made provisional 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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