If by full name you mean scientific name, we have (3) genera in Washington lakes, Crangonyx, Gammarus, and Hyalella. As to their underwater behavior, they characteristically swim on their side.
I tied some scuds up to mimic these. They absolutely murder the lake I took that throat sample from. It's a lot like the rf scud Ira posted his sbs from a while back, however I use all black dubbing and chop up some peacock color angel hair to get a hint of that sheen that these displayed. Also I add a few more ribs, and trim the underbody to mimic the larger "leg group" near the head of the scud. Probably way too complex but it works too well to not put in the effort. It's a lake where a fair bit of kids learn (it's at a vacation spot), so it's fun tying one of these on for them and seeing them catch their first fish.
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