Phylum - Mollusca

Explanation

( i) The body of these animals is soft and slimy. Hence, called 'Molluscs'.
(ii) This is the second largest phylum in animal kingdom.
(iii) These animals are aquatic or terrestrial. Most of the aquatic forms are marine, but few are fresh water dwellers too.
(iv) Body of these animals is non-segmented, triploblastic, eucoelomate, and soft.
(v)Except snail, their body shows bilateral symmetry.
(vi)Body is divided into head, foot and visceral mass.
(vii)Visceral mass is covered with mantle. This mantle secretes hard, calcareous shell. This shell may be internal or external or even absent in some.
(viii) They are unisexual. e.g. Snail, Octopus, Bivalve, etc.