What are the 4 main classes of mollusks?

The major classes of living mollusks include gastropods, bivalves, and cephalopods (Figure below).

• Gastropods. Gastropods include snails and slugs. They use their foot to crawl.
• Bivalves. Bivalves include clams, scallops, oysters, and mussels.
• Cephalopods. Cephalopods include the octopus and squid.

What are the 5 main classes of Mollusca?

The Phylum Mollusca consist of 8 classes: 1) the Monoplacophora discovered in 1977; 2) the worm-like Aplacophora or solenogasters of the deep sea; 3) the also worm-like Caudofoveata; 4) the Polyplacophora, or chitons; 5) the Pelecypoda or bivalves; 6) the Gastropoda or snails; 7) the Scaphopoda, or tusk shells; and 8) …

What are the three main classes of phylum Mollusca?

Mollusks are subdivided into seven classes with most species found in three of those classes: Gastropoda, Bivalvia, and Cephalopoda.

What is the classification of Mollusca?

Mollusca
Mollusca/Scientific names

What are the 3 class of mollusk What do they all share how are they each different?

The three main parts of a mollusk’s body include a muscular foot, a visceral mass, and a mantle. The three main types of mollusks are gastropods, bivalves, and cephalopods. Gastropods, like slugs and snails, can live on land or in the water.

What are the 5 groups of bivalves?

Bivalves as a group have no head and they lack some usual molluscan organs like the radula and the odontophore. They include the clams, oysters, cockles, mussels, scallops, and numerous other families that live in saltwater, as well as a number of families that live in freshwater. The majority are filter feeders.

What are the 6 molluscs?

Class Gastropoda – snails, slugs, limpets, whelks, conchs, periwinkles, etc. Class Bivalvia – clams, oysters, mussels, scallops, cockles, shipworms, etc. The Class Scaphopoda contains about 400 species of molluscs called tooth or tusk shells, all of which are marine.

What are the two classes of mollusk that are completely extinct?

Classification

What are the main characteristics of Mollusca?

Characteristic Features of Phylum Mollusca

• They are bilaterally symmetrical.
• They are triploblastic, which three layers.
• They show organ system grade of organisation.
• The body is soft and unsegmented.
• Body is divisible into three regions – head, a visceral mass, and ventral foot.
• Body is covered by a mantle and shell.

Is Mollusca a bilateral symmetry?

Mollusca can be found in freshwater, marine and terrestrial habitats. More features of molluscs include bilateral symmetry, soft or unsegmented bodies, respiration via ctenidium, ganglia/nerve comprised nervous system, haemocoel body cavity, etc.

What are the three main structures that all mollusk species have in common?

The three most universal features defining modern molluscs are a mantle with a significant cavity used for breathing and excretion, the presence of a radula (except for bivalves), and the structure of the nervous system.

What are the 3 main body regions of mollusc describe each region?

In general, mollusks have 3 body regions: a head, a visceral mass, and a “foot.” The head contains the sense organs and “brain,” while the visceral mass contains the internal organs. The “foot” is the muscular lower part of the body which is in contact with the substrate.

What class of mollusks is the best?

Class Scaphopoda: these mollusks have a very elongated body like their shell, which is shaped like a horn. These are also known as fang shells. This is one of the best known types of marine mollusks. Class Bivalve: are aquatic mollusks whose body is enclosed between two leaflets or shells.

What are the four classes of mollusks?

The study of mollusks is called malacology. There are four main classes in the phylum mollusca , gastropods , bivalve, cephalopod and Polyplacophora. Gastropods include nudibranches , slugs and snails. They compose over one third of the mollusk group and most are single spiral shells but some have no shells.

How many classes of mollusks are there?

There are seven classes of Mollusks: Monoplacophora, Polyplacophora, Aplacophora, Gastropoda , Scaphapoda, Bivalvia and Cephalopoda . Of these, Monoplacophora, Aplacophora and Scaphapoda are rare and/or extremely deep-water creatures, and will not be discussed.

What is the class and phylum of a mollusk?

Mollusks are subdivided into seven classes with most species found in three of those classes: Gastropoda, Bivalvia, and Cephalopoda. Gastropods make up the largest class of mollusks, and they include both snails and slugs. What are the 7 classes of mollusks? Phylum Mollusca is classified into seven classes;