schizopoda: in former classifications a division of Malacostraca; superseded by the orders Mysidacea and Euphausiacea
animal order: the order of animals
metoprolol: beta blocker (trade name Lopressor) used in treating hypertension and angina and arrhythmia and acute myocardial infarction; has adverse side effects (depression and exacerbation of congestive heart failure etc.)