Barcode of Life Data Systems (BOLD) Stats Specimen Records:1198 Specimens with Sequences:1105 Specimens with Barcodes:994 Species:49 Species With Barcodes:49 Public Records:821 Public Species:46 Public BINs:35
The Adelgidae is a small family of the Hemiptera closely related to the aphids, and often traditionally included in the Aphidoidea with the Phylloxeridae. Adelgids are often known as "woolly conifer aphids". The family is composed of species associated with pinespruce or other conifers, known respectively as "pine aphids" or "spruce aphids". This family includes the former family Chermesidae, or "Chermidae", the name of which was declared invalid by the ICZN in 1955. There is still considerable debate as to the number of genera within the family, and the classification is still unstable and inconsistent among competing authors.
There are about fifty species of adelgids known. All of them are native to the northern hemisphere, although some have been introduced to the southern hemisphere as invasive species. Unlike aphids, the adelgids have no tail-like cauda and no cornicles.
Adelgids only lay eggs, and never give birth to live nymphs as aphids do. Adelgids are covered with dense woolly wax. A complete adelgid life cycle lasts two years. Adelgid nymphs are known as sistentes, and the overwintering sistentes are called neosistens.
Rain can kill adelgids by dislodging eggs and sistentes from trees.