What are two mollusk characteristics?

What are two mollusk characteristics? 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

What are two mollusk characteristics?

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.

Which type of mollusk has 2 shells?

Bivalvia
Class Bivalvia (“two shells”) includes clams, oysters, mussels, scallops, and geoducks. Members of this class are found in marine as well as freshwater habitats.

What are 5 characteristics of mollusks?

Mollusca Characteristics

  • They are mostly found in marine and freshwater.
  • They exhibit organ system level of organization.
  • Their body has a cavity.
  • The body is divided into head, visceral mass, muscular foot and mantle.
  • The head comprises of tentacles and compound eyes.
  • The body is covered by a calcareous shell.

Which class of mollusks contains animals with 2 shells?

class Bivalvia
Bivalves. There are more than 8,000 species of bivalve mollusks in the class Bivalvia. These animals have two shells, or valves, that are usually similar in shape and size and are hinged along one side.

What are the unique characteristics of mollusks?

Main characteristics of Mollusca : Unsegmented soft body with bilateral symmetry. Presence of an internal or external shell. A toothed tongue (made mostly of chitin) called the radula. A mantle which is a fold in the body wall that lines the shell.

What are three types 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.

What are the 6 categories of mollusks?

Mollusks can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda. These classes are distinguished by, among other criteria, the presence and types of shells they possess.

How are mollusks classified?

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. The remaining classes (Polyplacophora, Aplacophora, and Monoplacophora) have fewer species.

How do you classify mollusks?

What are the four characteristics of mollusks?

Main characteristics of Mollusca :

  • Unsegmented soft body with bilateral symmetry.
  • Presence of an internal or external shell.
  • A toothed tongue (made mostly of chitin) called the radula.
  • A mantle which is a fold in the body wall that lines the shell.
  • Muscular foot (and/or tentacles in some).