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Marsh spurge aphidOn this page: Identification & Distribution Other aphids on the same host
Identification & Distribution
Adult apterae of Aphis paludicola (see top aphid in first picture below) are dark brown with a thick covering of grey-white wax. The hairs on antennal segment III are quite long and finely pointed, and 1.1-2.0 times the basal diameter of segment III (cf. Aphis euphorbiae, which has the longest hairs on antennal segment III 0.55-0.95 times its basal diameter). The siphunculi are 0.70-1.37 times longer than the cauda. The cauda bears numerous (28 or more) hairs. The body length of adult apterae is 2.3-2.7 mm.
Note: whilst we cannot directly confirm the identity of the aphids pictured, they were on Euphorbia palustris, and Aphis paludicola is so far the only aphid species reported to occur on that plant. The aphids pictured are certainly one of the 'difficult' Aphis euphorbiae group of aphid species, with the siphunculi shorter or only slightly longer than the cauda. Unfortunately Börner (1940) only provided an extremely short description of Aphis paludicola, and we have been unable to access the redescription of Börner's specimens by Tashev (1966).
Images above copyright Aimaina Hikari under a Creative Commons CC-Zero (public domain) licence.
Aphis paludicola is thought to be monoecious holocyclic, like other members of the Aphis euphorbiae group. Its only known host plant is marsh spurge (Euphorbia palustris). The aphid has so far been found in Germany and Ukraine.
Other aphids on the same host
Aphis paludicola is found on one spurge species (Euphorbia palustris).
Blackman & Eastop list only 1 species of aphid as feeding on marsh spurge (Euphorbia palustris) worldwide, and provide formal identification keys (Show World list). Of those aphid species, Baker (2015) lists 0 as occurring in Britain (Show British list).