Zaschizonyx

Taxonomy

Family: Tenthredinidae
Family common name: common sawflies
Subfamily: Tenthredininae
Tribe: Sciapterygini
Genus: Zaschizonyx Ashmead, 1898
Subgenera: none

Background

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 compared to others 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).

Zaschizonyx is monotypic. Zaschizonyx montana can be recognized by the distinct reddish-brown and white coloration of the body (Taeger et al. 2010, BugGuide 2019).

Diversity

There is one described extant species worldwide, and it is Nearctic (Taeger et al. 2010).

Diagnostic characteristics

Subfamily characters

Genus characters

May be confused with

Zaschizonyx can be confused with similar species in the subfamily Tenthredininae. It can be distinguished from most other genera by the angle on the posteroventral area of the metepimeron, and from closely related Filacus by the widely notched clypeus (Goulet 1992).

Exotic pest species of concern

none

Host associations

Zaschizonyx montana feeds on Symphoricarpos (snowberry) (Goulet 1992).

Life history

unknown

Distribution

World: This genus is known from North America (Taeger et al. 2010).

North America: Zaschizonyx montana is widespread in North America, with collections in Ontario, Texas, and the Pacific coast (BugGuide 2019).

Map data from: GBIF.org (29 October 2019) GBIF Occurrence Download Zaschizonyx, 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.

Zaschizonyx montana male lateral habitus; photo by J. Orr, WSDA

Zaschizonyx montana male lateral habitus; photo by J. Orr, WSDA

Zaschizonyx montana male dorsal habitus; photo by J. Orr, WSDA

Zaschizonyx montana male dorsal habitus; photo by J. Orr, WSDA

Zaschizonyx montana male face; photo by Q. Baine, WSDA

Zaschizonyx montana male face; photo by Q. Baine, WSDA