Penaeoidea is the larger of the two superfamilies of prawns. It comprises eight families, three of which are known only from fossils.1] The fossil record of the group stretches back to Aciculopoda, discovered in Famennian sediments in Oklahoma.
Penaeidae is a family of prawns, although they are often referred to as penaeid shrimp. It contains many species of economic importance, such as the tiger prawn (Penaeus monodon), whiteleg shrimp, Atlantic white shrimp and Indian prawn. Many prawns are the subject of commercial fishery, and farming, both in marine settings, and in freshwater farms. Lateral line-like sense organs on the antennae have been reported in some species of Penaeidae. At 210 metres per second (760 km/h), the myelinated giant interneurons of pelagic penaeid shrimp have the world record for impulse conduction speed in any animal. [more]
Sicyonia is a genus of prawns, placed in its own family, Sicyoniidae. It differs from other prawns in that the last three pairs of its pleopods are uniramous, rather than biramous as seen in all other prawns. [more]
^ ab Rodney Feldmann & Carrie Schweitzer (2010). "The oldest shrimp (Devonian: Famennian) and remarkable preservation of soft tissue". Journal of Crustacean B
iology30 (4): 629?635. doi:10.1651/09-3268.1.