Antrimpos speciosus was a large Eucarid (shrimp) from the lithographic limestone beds of Solnhofen, Bavaria, Germany. These limestone beds are the result of a series of islands and shallow lagoons. The fine grained sediments in these lagoons produced nearly flawless remains of the plants and animals which fell or were washed into them as well as some of their natural residents. It possessed an elongated, segmented body with a light carapace (exoskeleton) which covered the thorax and head regions. They also had multiple pairs of limbs and a fanlike tail.
Antrimpos belongs to the phylum Arthropoda and class Malacostraca. This class also includes crabs, crayfish, shrimp, "sow bugs" (rolly polly bugs), and lobsters. They ranged from the Early Cambrian to the present. The class Malacostraca is divided into five superorders: Phylocarida, large with a bivalved shell and an extended abdomen; Syncarida, lacked a carapace and egg carrying brood pouch; Hoplocarida, which includes a single surviving order, the Stomatopoda (mantis shrimp); Peracarida, which includes amphiopods and isopods (sow bugs); and Eucarida - krill, shrimp, decapod shrimp, crayfish, crabs, and lobsters belong to this order. Eucarida are also known as "true shrimps."
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