shrimps, crabs, lobsters, water fleas, and relatives. Crustaceans are arthropods , related to insects and myriapods. They are the most diverse animal group in underwater habitats. Only a few crustacean groups have evolved the ability to live on land, and like amphibians, these terrestrial crustaceans still need water or damp places to live.
The drug detection times for Xanax or any other Benzodiazepine in a urine drug test can be as long as 6 weeks depending on your use level. There are a multitude of combinations of drugs that can be on any given test and Benzodiazepines can potentially be on any one of them.
Depending on the dosage, it can be detected up to  5 days after the last dose. A single 0.5mg dose may not be detectable after say 3 days. But urine tests look for metabolites of a drug. In the case of Xanax, the metabolite is Î±- hydroxyalprazolam, which has the same half-life as xanax itself. If you are taking an Extended-Release version of it, then it may be in a your system for a bit longer. (Other benzos like clonazepam or diazepam, can remain for up to 10 days in your system due to very long half-lives).