Family common name: common sawflies
Genus: Ardis Konow, 1886
The Tenthredinidae are the most species-rich family and are found throughout the world, in all continents but Antarctica. They are known as the “common sawflies.” They can generally be recognized by a cylindrical body and long, segmented antennae. Otherwise, they come in a variety of colors, sizes, and forms (Goulet 1992).
Sawflies in the subfamily Blennocampinae have a diverse set of life histories and habits. Many species are restricted to subtropical and tropical regions, but the genus is still fairly species-rich in North America. Blennocampinae includes many sawflies that feed on ornamental and forestry crops. This subfamily can be recognized by wing venation and bidentate mandibles (Smith 1969d).
Ardis is medium-sized, about 6.4–7 mm in length, and entirely black with transparent wings (Smith 1969d).
Ardis can be confused with similar species in the subfamily Blennocampinae. It can be distinguished from most other genera by the deep postocular furrow and curved apex of fore wing veins 2A and 3A (Smith 1969d).
In North America, Ardis feed on species of Rosa (rose) (Goulet 1992).
The specific biology of Ardis atrata is unknown.
Ardis brunniventris is known as the rose tip sawfly and is considered a minor pest of wild and ornamental roses. The larvae burrow into stems of rose plants and feed on the pith. The affected part of the plant will wither, and the bud will not bloom (Gutue and Ungureanu 2015). The larva has reduced prolegs (Smith 1969d).
North America: Ardis atrata occurs in the Pacific Northwest region, with records in British Columbia, Washington, and Oregon, and south into California. Ardis brunniventris is possibly an introduced species, and is now found throughout most of the United States and southern Canada (Smith 1969d).
Map data from: GBIF.org (29 October 2019) GBIF Occurrence Download Ardis
Details about data used for maps can be found here.