This common name refers to only one family.
These are pretty much always called Water Scorpions.
Ranatra Water Scorpion Adult
View 7 PicturesHere's a big water scorpion (no relation to actual scorpions). These guys are just about the most sinister-looking creatures you could find, and what's especially creepy is that they can come up out of the water and fly around, as I learned when one left my aquarium and buzzed my head while I was peeking into the microscope at a mayfly nymph.
Collected March 10, 2004
from in Added to Troutnut.com by on January 25, 2006