Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Upcoming Events

Discussion, insects and people from the 2018 BugGuide Gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa

Photos from the 2010 Workshop in Grinnell, Iowa

Photos from the 2009 gathering in Washington


Omak, Okanagan County, Washington, USA
July 18, 2011
Size: 20 mm


How are larvae of the two North American genera distinguished? I have not seen any key that goes past family.

Good question.
In the table on p. 752, Aquatic Insects of North America, fourth edition, Protanyderus is listed as having a western distribution, and Protoplasa an eastern distribution. So basically, I'm assuming the genus ID based on a record of geographical distribution rather than morphology. Perhaps not solid enough for BugGuide.

Good enough
The species and genera do not seem to be widespread.

P. vipio
The only species recorded for Oregon is P. vipio; it occurs from Washington to Southern California. P. margarita occurs in the Rocky Mountains. Also, this genus seems to now be a synonym of Protoplasa.

According to Alexander(1) Protanyderus margarita is found in Oregon and British Columbia, beyond the range given in the work you cite.

Check the revision. The distribution maps seem to have been updated for these species.

I saw the maps, but I didn't see an explanation of the change from the 1965 catalog. Perhaps not all specimens were examined. I saw at least one note saying a type was not available for study.

According to the revision: "OTHER MATERIAL EXAMINED. See Map 14. USA, OR. Dayton, Willamette, 17.iv.1949, coll. K.D. Ferder [1m#]"

Though the map states the records from north of California as larvae only. Not sure where the association with the adults of P. vipio stems from... earlier publication perhaps. It also mentions that there are records from Canada that weren't included.

I had to poke through the revision a bit, but apparently this is a male specimen that was studied, so the map must be in error with regards to only larvae being known north of California. The data point is missing entirely from the map, actually. This location is near Portland.

Comment viewing options
Select your preferred way to display the comments and click 'Save settings' to activate your changes.