Illustrated identification guide to the Nordic aphids feeding on Conifers (Pinophyta) (Insecta, Hemiptera, Sternorhyncha, Aphidomorpha) Author Albrecht, Anders Christian text European Journal of Taxonomy 2017 2017-07-24 338 1 160 journal article 22023 10.5852/ejt.2017.338 be9f3ab9-3131-4e11-8d29-a94275ffaac9 2118-9773 3834349 86786AB1-4A1A-4A1E-B42B-53B73D66ED60 Adelges (Dreyfusia) merkeri (Eichhorn, 1957) Fig. 7 Diagnosis Fund. juv. only with spinal and marginal wax pore plates; wax pore plates on inner margins of meso- and metathoracic spinal sclerites divided into 3–4 often angular areas with relatively large pits of irregular shape. Al. gallicola: wax glands on head and prothorax of granular appearance, without or with a few indistinct facets. Galls like those of A. nordmannianae but are usually larger ( 7–22 mm ) and open in June–July. Holocyclic and dioecious, alternating between Picea orientalis and Abies (see also p. 21). Recorded primary hosts Pinaceae : Picea orientalis . Distribution S. A8 (A7) Wax glands of overwintering larvae with double-walled facets secreting glossy, stiff, straight or curved tubes of wax; galls usually with protruding needles and hairs or waxy bloom ................................................................................................................................A9 A9 (A10) Overwintering larvae (where known): dorsal sclerites bearing single larger wax pores ringed by small glands of irregular shape. Al. gallicola: ant. IV and V often with broad, indistinct basal articulation .................................................. Adelges (Adelges) Vallot, 1836