Family common name: common sawflies
Genus: Deda Gibson, 1980
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 Tenthredininae subfamily are relatively large in the family, often with distinct colorful markings. Some are wasp-like with black and yellow stripes (Goulet 1992). Many species’ life histories are not known. Some Tenthredininae species feed uniquely, as adults, on flower pollen and other insects (Smith 1993). They can be distinguished from other subfamilies by wing venation (Goulet 1992).
Deda is a North American genus of few species, mostly black and white in color, about 6–10 mm in length (Gibson 1980a).
A key to species is included in Gibson 1980a.
Deda can be confused with similar species in the subfamily Tenthredininae. It can be distinguished from most other genera by the expanded metepimeron, long labrum, and the centered anal crossvein. Deda can be distinguished from closely related Macrophya by the relative length of the hind leg segments and by the size of the eye as viewed from the side (Gibson 1980a).
The hosts of Deda are unknown, but there is a single collection of an adult on Cynopterus terebinthinus (turpentine wavewing) (Gibson 1980a).
World: The genus is present in North America (Taeger et al. 2010).
North America: Deda occurs in western United States, with records from California, Oregon, and Nevada (Gibson 1980a).
Map data from: GBIF.org (29 October 2019) GBIF Occurrence Download Deda and the Smithsonian National Museum of Natural History Entomology Collection (USNM) and the Oregon State Arthropod Collection (OSAC)
Details about data used for maps can be found here.