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Genus Mimeuria

Maple leaf nest aphids

On this page: Mimeuria   Mimeuria ulmiphila 

Mimeuria [Pemphigini]

Identification: Mimeuria is a monospecific genus in the Pemphigini, with Mimeuria ulmiphila as the only species. It is characterised by the antennal terminal process on both winged and wingless adults being vestigial, less than 0.1 times the length of the base of the last antennal segment. Also the apterae on the secondary host have one-segmented tarsi.

Mimeuria ulmiphila makes a leaf-nest gall on maple.

 

Mimeuria ulmiphila (Maple leaf-nest aphid)

Fundatrices of Mimeuria ulmiphila live in terminal leaf nests (see first picture below) formed on field maple (Acer campestre), by inhibition of shoot growth, twisting and folding of leaves. These fundatrices are olive green-grey, covered with white wax wool. Their antennae are 5-segmented and are less than 0.25 times the body length. The third antennal segment is 1.2-1.9 times the length of the fifth antennal segment (including the terminal process). The body length of apterous Mimeuria ulmiphila fundatrices is 3.5-4.5 mm.

Images copyright Dr László Érsek, all rights reserved.

These fundatrices produce numerous dark brown alates, with a body length of 2.6-3.3 mm (see second picture below), which fly over an extended period (June-November). They have transversely elongate secondary rhinaria extending at least over the third to the fifth antennal segment. The sixth antennal segment of these alates is without secondary rhinaria other than those beside the primary rhinarium.

Images copyright Dr László Érsek, all rights reserved.

Apterous exules of Mimeuria ulmiphila live mainly on roots of elm (Ulmus); they are yellow, thickly wax-powdered, and have a body length of 1.3-2.3 mm.

Maple leaf-nest aphids host alternate between their primary host, field maple (Acer campestre), and their secondary host, elm roots (Ulmus). On elm they live singly encased in brown microrrhizal cysts. Sexual forms are produced in autumn and return to field maple, but in western Europe they may remain on elm roots all year. There may also be overwintering of immature stages on the bark of field maple. Mimeuria ulmiphila has been recorded from several European countries including Britain, France, Germany, and Hungary as well as Turkey and Russia.

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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 sp 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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References

  •  Blackman, R.L. & Eastop, V.F. (2006). Aphids on the world's herbaceous plants and shrubs. Vols 1 and 2. John Wiley & Sons.