1) Animal order 2) Order mysidacea 
The Mysidacea is a group of shrimp-like crustaceans in the superorder Peracarida, comprising the two extant orders Mysida and Lophogastrida and the prehistoric Pygocephalomorpha. Current data indicate that despite their external similarities, the three orders are not closely related, and the taxon Mysidacea is not used in modern taxonomy. ...
Mysidacea is an order of crustaceans of the sub-class Malacostraca in which the thorax is covered by the carapace and the exopodite of the antenna is scale-like. The abdomen terminates in a tail fan.
[n] - opossum shrimp
order Mysidacea noun opossum shrimp