Nebaliacea

Nebaliacea

[nə‚bā·lē′ā·shə]
(invertebrate zoology)
A small, marine order of Crustacea in the subclass Leptostraca distinguished by a large bivalve shell, without a definite hinge line, an anterior articulated rostrum, eight thoracic and seven abdominal somites, a pair of articulated furcal rami, and the telson.