Urtica dioica, Duin en Kruidberg
front and rear spiraculum, lateral
front and rear spiraculum, dorsal
mandibles, and spinulation of the ‘hip’
Urtica dioica, Nieuwendam; cephalic skeleton and mouth field
abdomen end ventral and (weaker magnification) dorsal
Mandibles with 3 teeth that hardly or not alternate. Rear spiracula on a common base, touching each other, with 3 papillae, separated by 3 flattened, fan-shaped, distally deeply cleft, “hairs” (visible only under strong magnifications).
De Meijere (1924a) and Nowakowski(1964a) describe the mandibles as 2-toothed and alternating. However, SEM-pictures by Dempewolf (2001a) clearly show that the mandibles are 3-toothed and not alternating, as is obvious also in the ©s above. Dempewolf also found that the fan-shaped setae on the rear spiracula are not limited to A. pseudoreptans, as was stated byNowakowski, but occur in all three Nettle-mining Agromyza‘s. (For anthracina this was depicted already in de Meijere’s publication.