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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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