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Adelges Vallot, 1936
This genus contains about 30 species of adelgids. They can be distinguished from the genus Pineus by having 5 pairs of abdominal spiracles (4 pairs in Pineus). The galls are cone-shaped. Most species go through the complex life cycle described under the family Adelgidae including the sistens form on the secondary host which produce either progrediens or winged sexuparae. However, several species do not undergo sexual reproduction and host change. Instead they live exclusively on Picea or on the secondary host like the hemlock woolly adelgid which lives exclusively on Tsuga.
Currently, the following species have been entered into the system: