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 of 2018 gathering

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

Riffle Beetle Larva - Optioservus

Riffle Beetle Larva - Optioservus
Eramosa River, Guelph, Wellington, Ontario, Canada
January 13, 2009
Size: 5.0 mm
Here's an Elmid larva for the guide. Sifted from detritus, in association with adults of this species. The flattened, armor-plated body, and terminal gill chamber are characteristic (shared with the Lutrochidae, which have rounder abdominal tip and are rarer),

Moved from Stenelmis crenata.

It's difficult to make out in this view, but the cross section is triangular, not hemicylindrical as in Stenelmis. See here for an example of Stenelmis larva.

Love to see those larval associations :-)

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