Brief of Mollusca’s class-GASTROPODA

              The word Gastropoda is derived from two Greek words gaster=belly and podos=foot. It has three subclass namely Prosobranchia ,Opisthobranchia and  Pulmonata.The subclass Prosobranchia has three orders. The three orders are as follow. a) order1:-Archaeogastropoda b)order2:-Mesogastropoda c)order3:-Stenoglossa

         The subclass Opisthobranchia has 11 orders. They are as follow .

a) order1:-Onchidiacea                       b)order2:-Cephalaspidea         

 c) order3:-Anaspidea or Aplysiacea  d) order4:-Pteropoda

e) order5:-Acochillidiacea                   f) order6:-Phililnoglossacea

g) order7:-Saccoglossa                         h) order8:-Notaspidea

i) order9:-Nudibranchia                        j) order10:-Rhodopacea

k)order11:-Pyramidellacea                       

 The subclass Pulmonata has two orders namely as

a) order1:-Bassommatophora   b) order2:-Stylommatophora