Species Americorchestia megalophthalma

Bousfield, E.L. 1991. New Sandhoppers (Crustacea: Amphipoda) from the Gulf Coast of the United States. Gulf Research Reports 8(3): 271-283. https://aquila.usm.edu/gcr/vol8/iss3/7/

This open-access article includes a useful "Key to North American Genera of Sand-Burrowing Taltridae" - the key is somewhat technical (you have to know the names of the body parts).

For talitrid amphipod morphology, the following paper (also open-acces) gives a great introduction to the morphology, even though it is not focused on the North American fauna:

Fenwick, G. and R. Webber. 2008. Identification of New Zealand's terrestrial amphipods (Crustacea: Amphipoda: Talitridae). Tuhinga 19:29-56.

Links to a series of videos focused mainly on microscopic identification of specimens of plant-feeding arthropods (and potential pest species), including sections on mites, thrips, aphids, whiteflies, mealybugs, stink bugs, scale insects, leafhoppers/planthoppers, and some moths/caterpillars.

There are also other ID tools and videos that can be searched for here:
https://idtools.org/identify.php?format%5B%5D=website&keyword=&category=1&sortby=date+DESC

Hello, how are you doing?I hope you are all fine
I have a little problem...
Today i saw a creature (looked like an insect to me ) going under my couch.It was black in the size of my palm, circular and it was very fast.I couldnt see it clearly
I think it had many legs but i am not sure because it was very fast
Then me and my friend saw it leaving the couch and going to the kitchen.
My friend saw it closer and she said it was flat, but we cants say for sure because we didnt manage to see it clearly
It didnt look like a mouse or a rat , more like an insect like a spider or something but it was very circular to be a spider