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Malacostracans

      Malacostraca is the largest of the six classes of crustaceans, containing over 25,000 extant species, divided among 16 orders. Its members display a greater diversity of body forms than any other class of animals, and include crabs, lobsters, shrimp, krill, woodlice, scuds (Amphipoda), mantis shrimp and many other less familiar animals. They are abundant in all marine environments and have also colonised freshwater and terrestrial habitats. They are united by a common "Bauplan", comprising 20 body segments (rarely 21), divided into a head, thorax and abdomen.

Source: http://en.wikipedia.org/wiki/Malacostraca
Ceratiocaris papilio Salter in Murchison, 1859Budil et al. (2010), Fig. 7 G PB513
Ceratiocaris papilio Salter in Murchison, 1859 YA2836
Ceratiocaris M’Coy, 1849 PB1113
Ceratiocaris M’Coy, 1849 SM115
Ceratiocaris M’Coy, 1849 AH40
Ceratiocaris M’Coy, 1849 AH322
Ceratiocaris M’Coy, 1849 AH150
Ceratiocaris M’Coy, 1849 MD220
Ceratiocaris M’Coy, 1849 p1432
Ceratiocaris M’Coy, 1849 Ich492
Ceratiocaris M’Coy, 1849 Ich493
Ceratiocaris M’Coy, 1849 JH147
Ceratiocaris M’Coy, 1849 p5594
Ceratiocaris M’Coy, 1849 p5600
Ceratiocaris M’Coy, 1849 p6231
Ceratiocaris M’Coy, 1849 SM275
Ceratiocaris M’Coy, 1849 p1261
Ceratiocaris M’Coy, 1849 p5596
Ceratiocaris M’Coy, 1849 p5604
Ceratiocaris M’Coy, 1849 SM156

Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]