Pachyprotasis

Taxonomy

Family: Tenthredinidae
Family common name: common sawflies
Subfamily: Tenthredininae
Tribe: Macrophyini
Genus: Pachyprotasis Hartig, 1837
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).

Pachyprotasis is monotypic in North America. Pachyprotasis rapae is about 7–10 mm in length and black and white with angled facial features (Gibson 1980b, BugGuide 2019).

Diversity

There are 210 described extant species worldwide. One species occurs in North America (Taeger et al. 2010).

Diagnostic characteristics

Subfamily characters

Genus characters

May be confused with

Pachyprotasis 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. Pachyprotasis can be distinguished from closely related Macrophya by the longer fusion of anal veins and by the size of the eye as viewed form the side (Goulet 1992).

Exotic pest species of concern

none

Host associations

Pachyprotasis rapae feeds on Scrophularia (figwort), Solidago (goldenrod), Betonica (hedgenettle), Fraxinus (ash), and Anthirrhinum (snapdragons) (Goulet 1992).

Life history

unknown

Distribution

World: The genus is present in North America and is common and species-rich in East Asia (Smith 2003b, Taeger et al. 2010).

North America: Pachyprotasis rapae occurs throughout Canada and the United States and in Chihuahua, Mexico (Smith 2003b).

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

Details about data used for maps can be found here.

Pachyprotasis rapae female lateral habitus; photo by J. Orr, WSDA

Pachyprotasis rapae female lateral habitus; photo by J. Orr, WSDA

Pachyprotasis rapae female face; photo by Q. Baine, WSDA

Pachyprotasis rapae female face; photo by Q. Baine, WSDA

Pachyprotasis rapae male lateral habitus; photo by J. Orr, WSDA

Pachyprotasis rapae male lateral habitus; photo by J. Orr, WSDA

Pachyprotasis rapae male face; photo by Q. Baine, WSDA

Pachyprotasis rapae male face; photo by Q. Baine, WSDA

Pachyprotasis rapae fore wing; photo by P. Jones, WSDA

Pachyprotasis rapae fore wing; photo by P. Jones, WSDA