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Brachycaudus lychnidis species-group

Campion aphids

On this page: Identification & Distribution 

Identification & Distribution:

The dorsal abdomens of adult apterae of Brachycaudus lychnidis sp. grp. (Brachycaudus klugkisti and Brachycaudus lychnidis ss.) have an extensive solid shiny black shield (see first picture below) with the underside red-brown. Their median frontal tubercle is about as high as the antennal tubercles. Their antennae are 0.6-0.8 of the body length. Their legs have the fore femora pale with dorsally dark apex; the hind femora are dusky with a pale base. Brachycaudus lychnidis & B. klugkisti tibiae are pale with the apex and base dark. Their siphunculi are dark truncated conical, and the cauda is rounded or semi-oval. They often have a wax ring around the terminal abdominal segments - this was very apparent in numerous live specimens, but is not mentioned in the literature, presumably because such deposits are not apparent in prepared slide specimens. Immatures (see second picture below) are often suffused with dark red between and around the siphunculi.

The two members of the species group can be distinguished by the number and length of hairs on the third antennal segment.

  • Brachycaudus lychnidis has 15-24 hairs on the third antennal segment, the longest of which are 32-53 mum long.
  • Brachycaudus klugkisti has 6-15 hairs on the third antennal segment, the longest which are 17-29 um long.
The clarified slide mounts below are of adult viviparous female Brachycaudus lychnidis : wingless, and winged.

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

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

The campion aphids Brachycaudus lychnidis and Brachycaudus klugkisti both live all year on red campion (Silene dioica) and related species. A further aphid species, Brachycaudus lychnicola, also has the same host, but lives at the base of the plant. All the aphids we have found on campions have been living on the upper parts of the plant. Oviparae and apterous males are produced in October. Both Brachycaudus lychnidis and Brachycaudus klugkisti are found in Britain and over most of Europe, with the former species extending eastwards to western Siberia.

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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