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Megoura viciae

Vetch aphid

On this page: Identification & Distribution 

Identification & Distribution:

Megoura viciae are large apple green to dark bluish green aphids. The adult aptera (see first picture below) has a black head and antennae, the latter being longer than the body. The prothorax is black, much narrower than the body which is green and globular. Black crescent-shaped sclerites are present in front of the siphunculi which are black and swollen in the middle, and about the same length as the cauda. The legs and cauda are also black.

The alate (see second picture above) has a green abdomen with black antesiphuncular and marginal sclerites, and dorsal cross bands on abdominal tergites 7 and 8.

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

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

The vetch aphid does not host alternate but spends it entire life cycle on leguminous plants, especially vetch, peas and broad beans. Eggs are laid at the base of vetch or pea plants and hatch in spring. Populations build up and after three generations winged forms are produced which disperse to other plants. Megoura viciae generally move to the seed pods in autumn.

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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