What are the characteristics for molluscs?
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.
What is the unique characteristic of molluscs?
Despite their amazing diversity, all molluscs share some unique characteristics that define their body plan. The body has a head, a foot and a visceral mass. This is all covered with a mantle (also known as a pallium) that typically secretes the shell.
What characteristics are universal to mollusks?
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 4 basic features of all 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).
What are 3 traits that all mollusks have?
Some of these characteristics are the presence of a shell, the type of shell, the type of foot, the arrangement of teeth in the radula, and the complexity of the nervous system. The three major groups of mollusks are gastropods, bivalves, and cephalopods (SEF ul o pods).
What are some characteristics of bivalves?
The bivalves are bilaterally symmetrical mollusks, enclosing the soft internal body. Common feeding characteristics of bivalves include filtering out particle food through an enlarged pair of gills known as ctenidia. Most bivalves are sedentary, but some use their foot to glide across substrate.
What are the physical characteristics of a mollusk?
Characteristics of Mollusks. Mollusks are soft-bodied invertebrates with bilateral symmetry and usually one or two shells. Their organs are in a fluid-filled cavity; the word mollusks in Latin means “soft”. Most of the mollusks live in water but some live on land. There are more than 110,000 species that have been identified.
What kind of animal is the phylum Mollusca?
Phylum Mollusca Definition The members of the Phylum Mollusca are soft-bodied animals, unsegmented with a distinct head, muscular foot, and visceral lump. History of Phylum Mollusca
Which is a characteristic of the larva in Mollusca?
The development is either direct or indirect. When the development is indirect, it includes a characteristic larva, veliger, trochophore or glochidium. Asexual reproduction is absent. What are the General Classification of Phylum Mollusca?
How are mollusks different from Ecdysozoa and arthropods?
They are distinct from the Ecdysozoa (nematodes and arthropods) based on evidence from analysis of their DNA, which has changed our views of the relationships among invertebrates. Mollusca is the predominant phylum in marine environments, where it is estimated that 23 percent of all known marine species belong to this phylum.