Mollusks and their importance for life
Call the MIA kids already.
The word “mollusk” comes from the Latin word molluscus which means soft. So the phylum Mollusca is a group of invertebrates that have soft bodies. Their soft bodies are protected by shells, although there are some that have no shells. Well-known mollusks to us are snails. Snails are one mollusk that are included in the class Gastropoda, which moves with its abdomen.
Characteristics of mollusks:
– Multi-cellular invertebrates
– Lives in both land and water
– Triploblastic coelomate
– Has a biletaral symmetric body structure
– Body consists of legs, visceral mass, and coat
– Has a nervous system in the form of a nerve ring
– Excretory organ in the form of nephridial
– Has radula (toothed tongue)
– Sexual reproduction
Mollusks are classified into 5 classes; Polyplacophora, Scaphopoda, Gastropoda, Bivalvia, and Cephalopoda.
1. Polyplacophora: Chiton sp
2. Scaphopoda: Dentalium vulgare
3. Gastropoda: Sphincterochila boissieri
4. Bivalvia: Pinctada margaritifera
5. Cephalopoda: Octopus vulgaris