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Tuberculatus annulatus

Common oak aphid

Identification & Distribution  Other aphids on the same host 

Identification & Distribution:

The winged viviparae of Tuberculatus annulatus are very variable in colour ranging from yellowish, greyish-green or pink to purple in summer. The antennae are pale apart from black bands at the tips of the segments. The terminal process of the sixth antennal segment of the antennae is 0.87-1.1 times the length of the base of that segment. Abdominal tergites 1-3 each have a pair of spinal processes, with those on tergite 3 particularly large (these processes are difficult to see on live specimens). The tarsi are black. The siphunculi are dark on the distal third or more. The body length of Tuberculatus annulatus alates is 1.7-2.2 mm.

 

The micrographs below show two alate Tuberculatus annulatus, in alcohol.

 

The common oak aphid is found on the undersides of leaves of oak (Quercus spp.), especially English oak (Quercus robur) and, less commonly, sessile oak (Quercus petraea). Winged males and wingless oviparae occur in October. Tuberculatus annulatus is distributed throughout Europe to Siberia and north-west China, and has been introduced to Australia, New Zealand, North and South America.

 

Other aphids on same host:

Blackman & Eastop list about 225 species of aphids  as feeding on oaks worldwide, and provides formal identification keys for aphids on Quercus.

Acknowledgements

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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