Class Crustacea - small aquatic crustacean. Used in predator prey studies with hydra or fish. Generally, live animals will be shipped 7-10 days after receipt of the order. If you need immediate shipping, please call or email. We do not ship live animals over the weekend. If you need the live animals at a certain time, please call or email to verify availability and possible express shipping charges. If you are out of the state of Texas, we will ship overnight or 2nd day, so please select the out-of-state shipping charge when checking out.