lateral appendages in aquatic animals is 'parapodia'. explain and define: parapodia, papillae, cilia n tentacle.
Parapodia:They are the paired lateral appendages which arises from the body segment of the organism. They are the locomotary organ.
Papillae: They are small outgrowth, usually a nipple like structure.
Cilia: It is a fine, slender hair like structure present on the surface of the most of the eukaryotic cell. It can be of two types either motile or non motile. Motile cilia show rhythmic beating or waving movement in one direction whereas non motile cilia performs the sensory functions like antenna.
Tentacles are long, flexible and unsegmented extensions present usually around the mouth or oral cavity in invertebrates. They are used for grasping food or as sense organ for feeling the environment or as locomotary organ.