Hoplocarida

Hoplocarida is a subclass of crustaceans. The only extant members are the mantis shrimp (Stomatopoda), but two other orders existed in the Palaeozoic: Aeschronectida and Palaeostomatopoda.{cite journal |url=http://dpc.uba.uva.nl/ctz/vol67/nr03/art01 |journal=Contributions to Zoology |volume=67 |issue=3 |pages=155–186 |year=1998 |title=Palaeo- an...
Found on http://en.wikipedia.org/wiki/Hoplocarida

Hoplocarida

(from the article `crustacean`) ...to present; bivalved carapace encloses 8 pairs of leaflike limbs; movable rostrum; telson with caudal rami; marine; about 10 species.Subclass ... ...branches; eggs brooded under carapace; marine; on muddy bottoms low in oxygen; intertidal to the deeps; about 15 species in 3 families.Subclass ... [2 ...
Found on http://www.britannica.com/eb/a-z/h/69
No exact match found