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Drepanosiphinae : Drepanosiphini : Drepanosiphum oregonensis
 

 

Drepanosiphum oregonensis (= oregonense)

Dark-streaked maple aphid

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

Identification & Distribution

All adult viviparae of Drepanosiphum oregonensis are alate. Their body colour has been variously described as 'orange-yellow with a greenish tinge' and 'orange-brown thoracic lobes and pale green abdomen', preseumably reflecting different seasonal colour forms (see pictures below, and also Drepanosiphum platanoidis). Antennal segment III has a short black contrasting section near its base, as dark as the apex of that segment (cf. Drepanosiphum platanoidis, which has antennal segment II pale or dusky at the base). The apical rostral segment (RIV+V) is 0.5-0.8 times as long as the second hind tarsal segment (HTII). The fore femora are more than 1.5 times thicker than mid- and hind femora, and have a very distinct broad black longitudinal ventral stripe (cf. Drepanosiphum platanoidis, which has the fore femora less than 1.5 times thicker than mid- and hind femora, and sometimes has a rather inconspicuous dark ventral stripe). The siphunculi are cylindrical with dark tips, and the cauda is knobbed and pear-shaped. The adult alate body length is 1.9-2.6 mm.

Note: One of the key distinctive characteristics of Drepanosiphum oregonensis - the black contrasting section on segment III - is not clearly shown in the pictures below. For a picture showing this see here.

First image above copyright Slimguy, second image copyright Andrew Jensen,
both under a creative commons licence.

Drepanosiphum oregonensis is monoecious holocyclic on various maple (Acer) species. They feed on the leaf undersides. Sexuales have been found in October in California, and in July in Germany. The species is native to Eurasia, having been found in southern, central and eastern Europe, the Mediterranean region, south-west Asia, Kazakhstan, India and Pakistan. It was introduced to western USA some time before 1939, and more recently to Argentina.

 

Other aphids on the same host

Drepanosiphum oregonensis has been recorded on 12 maple species (Acer campestre, Acer circinatum, Acer granatense, Acer hyracanum, Acer macrophyllum, Acer monspessulanum, Acer oblongum, Acer opalus, Acer pseudoplatanus, Acer semenovii, Acer stevenii, Acer trautvetteri).

Acknowledgements

We are grateful to Andrew Jensen & Slimguy for making their pictures of Drepanosiphum oregonensis available for use under a creative commons licence.

Identifications were made by the copyright holders of the pictures. We have used the keys and species accounts of Granovsky (1939) and Hille Ris Lambers (1971) along with information from Roger Blackman & Victor Eastop in Aphids on Worlds Plants. We fully acknowledge these authors and those listed in the reference sections 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).

Useful weblinks

References

  • Granovsky, A.A. (1939). Three new species of Aphiidae (Homoptera) Proceedings of the Entomological Society of Washington 41(5), 143 Full text

  • Hille Ris Lambers, D. (1971). Two new taxa of Drepanosiphum Koch, 1855 (Homoptera, Aphididae) with a key to species. Entomologische Berichten 31(4), 72-79. Full text