What are the 3 main classes of mollusks?
The three major groups of mollusks are gastropods, bivalves, and cephalopods (SEF ul o pods). The largest group is the gastropods. These are mollusks like snails and slugs that have just one shell or no shell at all. Gastropods creep along on their broad foot.
Which 3 types of animals are in the Mollusca group?
Mollusks. The mollusk group spans over 50,000 known species. They include snails, clams, oysters, mussels, squid and octopods. In general, their bodies include three parts: the head, internal organs and a “foot.”.
What are the 3 parts of the mollusks body?
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 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) …
How many classes of mollusks are there?
8 classes
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 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 3 major parts of the body plan in mollusks from which of these major body parts is the shell secreted?
The four parts of the mollusk body plan are the foot (used for locomotion), mantle (which secretes the shell), shell (which covers), and viceral mass (contains heart and organs). Describe the characteristics of the three major classes of mollusks.
How many mollusk types are there today?
Around 85,000 extant species of molluscs are recognized. Molluscs are the largest marine phylum, comprising about 23% of all the named marine organisms. Numerous molluscs also live in freshwater and terrestrial habitats.
What class of mollusk is Octopus?
Cephalopod
Octopus/Class
Cephalopods are a group of molluscs that include the pearly chambered Nautilus, squids, and the octopus. They can be divided into three categories: the Nautiloidea (chambered Nautilus), the Ammonoidea (the extinct ammonites), and the Dibranchiata (squids, the extinct belemnites, and octopuses).
What are the 3 classes under the phylum Mollusca and how are they different?
The phylum Mollusca includes a wide variety of animals including the gastropods (“stomach foot”), the cephalopods (“head foot”), and the scaphopods (“boat foot”).
What are the 3 types of mollusks?
The three main types of mollusks most people are familiar with are: cephalopods – squid, octupus, etc; gastropods – snails and slugs including abalone ; and bivalves – like clams, oysters, and scallops. But there are five other living classes of mollusks and two extinct classes.
What are facts about mollusks?
Facts About Mollusks. Mollusks are interesting creatures that are found almost in all kinds of weathers with or without shells. Snails, squids, shellfish and their relatives belong to the mollusk group. Mollusks are soft-bodied invertebrates that have shells to protect them.
What are the important characteristics of Mollusca?
One of the characteristics of mollusca is having a soft body and is protected by a hard shell that is bilaterally symmetrical.
What are all the mollusks?
Mollusks (British spelling: molluscs) are a large and diverse phyla of invertebrate animals, featuring over 110,000 species. Their phylum name, Mollusca , means “thin-shelled,” though many species lack shells entirely. Mollusks include clams, oysters, scallops, mussels, snails, squid, octopuses, slugs, nudibranchs,…