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

See Moth submissions from National Moth Week 2023

Photos of insects and people from the 2022 BugGuide gathering in New Mexico, July 20-24

Photos of insects and people from the Spring 2021 gathering in Louisiana, April 28-May 2

Photos of insects and people from the 2019 gathering in Louisiana, July 25-27

Photos of insects and people from the 2018 gathering in Virginia, July 27-29

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

Previous events

Beetle at Home on Lily Pad - Donacia

Beetle at Home on Lily Pad - Donacia
East of Buckhannon, Upshur County, West Virginia, USA
August 16, 2005
Found this beetle while stalking Vesper Bluets on Lily pads. Confirmation, denial, elaboration of ID appreciated.

Moved from Donacia.


Sure Donacia!
- elongated hind legs, also water lilies are not food plants of Plateumaris spp.

aquatic leaf beetle
Apparently, Plateumaris species are very similar to Donacia. The only difference mentioned in this key to Alabama Donaciinae is whether the sutural margin of the elytra is straight to the apex [Donacia] or sinuate near the apex [Plateumaris]. Judging from the diagram, it's a small difference that would be difficult to see in most photos.
I wonder whether at least some of the photos on the Donacia page are actually Plateumaris species. Does anyone know a way to distinguish these two genera based on photographs?

Next year
These beetle seemed common enough. Next year I'll try to get a high resolution dorsal view of the rear of the elytra.


Stephen Cresswell
Buckhannon, WV

In the meantime...
since none of the photos currently on the Donacia page have been identified to species, and none of the comments under the photos have explained how Plateumaris can be distinguished from Donacia, I think it would be safer to move all the images to the subfamily level.

pretty sure youre genus is correct, we have some in florida from this genus and they look almost exactly the same, unfortunately we never id'd ours to species...

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