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

Information, insects and people from the 2019 BugGuide Gathering in Louisiana, July 25-27

Discussion, 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

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

Petrolisthes armatus? - Petrolisthes armatus

Petrolisthes armatus? - Petrolisthes armatus
Galveston County, Texas, USA
May 25, 2014
Size: 12mm
I noticed Bugguide did not have images this common invasive species of crustacean.
Found in "tide pools" near seawall, consisting of concrete rocks piled on a concrete slab base. Sargassum was particularly heavy, covering every part of the beach at least a foot deep.

Moved from ID Request.

Thanks for the addition!

Population density is very high in the gulf states!
Thanks for pointing this out! Just read that there can be 30,000 of these crustaceans per square meter in some locals. That would seem likely to have some impact on the local ecosystems!

That's what I read too
Luckily, where I was, the population was not nearly that high, only a few every couple square meters. Still pretty common, though.

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