Definition of Malacostraca in English:

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Pronunciation: /ˌmaləˈkɒstrəkə/

plural noun

A large class of crustaceans which includes crabs, shrimps, lobsters, isopods, and amphipods. They have compound eyes, which are typically on stalks.
Example sentences
  • On the whole the maxillopodan groups Ostracoda and Cirripedia and the Malacostraca have left the most significant fossil records.
  • Development ranges from direct to metamorphic among members of class Malacostraca.
  • Maxillopoda and Malacostraca are by far the most diverse of the groups and contain most animals you might typically recognize as crustaceans.


Modern Latin (plural), from malaco- 'soft' + Greek ostrakon 'shell'.

For editors and proofreaders

Line breaks: Mala|cos¦traca

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