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Aphidomorpha : Aphididae : Phloeomyzinae
 

 

Subfamily Phloeomyzinae

Biology and Morphology

On this page: Biology Morphology Genera

Biology

The Phloeomyzinae subfamily appears to comprise a single, somewhat variable, species (Phloeomyzus passerinii) in 1 genus. The aphids live on bark and in crevices on trunks of poplar trees (Populus spp.), with the heaviest infestations on 6 to 8-year-old trees. Phloeomyzinae passerinii apterae are light green, and are covered with dirty white wax wool.

There is no host alternation, and the only alatae are sexuales, but apterous viviparae often overwinter anholocyclically. Oviparae and males are produced in September-October in the northern hemisphere. After mating the oviparae each lay just two eggs (Eriosomatinae lay just one). Anholocyclic overwintering by apterous viviparae is also common, and may predominate. Phloeomyzus passerinii is found in Europe, north Africa, south-west, central and east Asia including Japan, plus South and North America (Maine).

 

Morphology

Phloeomyzinae passerinii apterae are green, covered with dirty white wax wool. The parthenogenetic forms are all apterous, with fused head and prothorax and 3-faceted eyes (triommatidia). Apterae and nymphs only have triommatidia (cf. Aphidinae, which always have multi-facetted compound eyes, usually with a triommatidium). The antennae are 6-segmented, with the terminal process shorter than the base of antennal segment VI. Secondary rhinaria are absent from all morphs. Wax glands form large faceted plates on abdominal segment VII. The siphunculi are slightly elevated pores. The anal plate is entire, and the cauda semicircular. The body length is 1.2-2.2 mm.

Phloeomyzinae passerinii aptera and alate, mounts. By permission of Roger Blackman, copyright AWP all rights reserved.

The wings of the sexual alatae are held flat at rest. The radial sector leaves from the apical part of the pterostigma. The media is once branched. The branches of the cubitus are separated at the base. The hind wing has two oblique veins.

The sexuales - both males and oviparae - are alate (as are oviparae of Aiceoninae, Tamaliinae, and most Neophyllaphidinae). The ovipara has no subsiphuncular nor scent plaques on the legs and lays only two eggs but the fundatrix is undescribed.

Phloemyzinae Genera

Acknowledgements

We particularly thank Colin Favret and Roger Blackman, who have provided invaluable assistance. Most of the subfamily diagnoses have been taken from Heie & Wegierek (2009b), Quednau (1999, 2003, 2010) and Blackman & Eastop (2021), with additional material from Russell (1982),Stroyan (1977), Stroyan (1984) and many others listed in the references for these pages.

We also thank Roger Blackman, for allowing us to reproduce his images, above. Note: Any images on pages that are not individually credited are copyright InfluentialPoints under a Creative Commons Attribution License.

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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