Pachypappella lactea (Tullgren, 1909),

Albrecht, Anders Christian, 2015, Identification guide to Nordic aphids associated with mosses, horsetails and ferns (Bryophyta, Equisetophyta, Polypodiophyta) (Insecta, Hemiptera, Aphidoidea), European Journal of Taxonomy 145, pp. 1-55: 22-24

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Pachypappella lactea (Tullgren, 1909)


Pachypappella lactea (Tullgren, 1909) 

Fig. 18View Fig, 19DView Fig


Apterae ovoid, robustly built, 0.6–1 mm, whitish, with a thin wax-dusting and exuding wax tufts from spinal and pleural wax gland plates on abdominal segments 3–6 (4 longitudinal rows of plates); marginal wax gland plates absent. Legs, antennae and rostrum short and stout. Antennae 4–5-segmented. Hind femur not distinctly thickened. RIV+V with a rather narrow and indistinct pale subapical zone. Tarsal segments fused (the segment border depicted in fig. 66b by Blackman & Eastop (1994, 2014) looks anomalous, and may be an artefact).

Dioecious, alternating between leaf galls on aspen Populus tremula  ( Salicaceae  ) and Norway spruce Picea abies  ( Pinaceae  ), where the aphids live on thin roots within and above the mor layer (a compacted

humus layer beneath the moss layer), among moss or litter. The apterae reside in nests of dense wax wool, 1.5–2 mm across, usually one aphid in each. The nests often occur in small groups, often within the looser, wider and less distinctly delimited wax exudate of Prociphilus xylostei  (deGeer, 1773) and Pachypappa  species. P. lactea  has a continuous anholocyclic population on spruce roots. Not associated with ants. Danielsson (1990a, 1990b) gives keys and descriptions of the root-feeding generations of Pachypappella  , Gootiella  and Pachypappa  . See also Carter & Danielsson (1991).


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