ANIMAL KINGDOM-CRUSTACEANS.

THE SUB-PHYLUM      CRUSTACEAN     is one of the largest   groups   in the phylum    Arthropods .The sub phylum is divided   into several   classes, the most important   of which are Malacostraca    and cirripedia . The class Malacostraca    includes crayfish,crabs,lobsters,, and   shrimps.Typical features   of Malacostracans    include a body    divided   into two   sections (a combined head   and thorax , and no abdomen );an   exoskeleton
(external skeleton) with a large plate( carapace) covering celhalothorax;stalked, compound   eyes ; and   two parts of antennae .The class   Cirripedia includes barnacles, which , unlike other   Crustaceans, spend their adult lives    attached   to a surface , such as rocks .Other characteristics   of Cirripedes   include an exoskeleton   of overlapping   calcareous plates;a body consisting    almost entirely   of thorax (the abdomen and head are   minute); and six parts of    thoracic    appendages (cirri) used for filter feeding.
The main Crustaceans   are CRABS, SHRIMPS.CRAYFISH,
BARNACLE.
CRUSTACEANS

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