What are molluscs state its features with examples?
Bilaterally symmetrical, coelomate protostomia with spiral cleavage and soft un-segmented body, covered by a thick muscular fold, the mantle which secrets a single or many shells, and a radula in the oesophagus except Bivalvia, and ventral muscular foot for locomotion.
Which is a feature unique to mollusks?
A feature unique to molluscs is a file-like rasping tool called a radula. This structure allows them to scrape algae and other food off rocks and even to drill through the shell of prey or catch fish. In creatures such as squid, the shell became small, moved inside the body and all but vanished.
What are 8 general characteristics of all molluscs?
General Characteristics of Phylum Mollusca:
- Habitat: They are mostly marine.
- Body Form: The body of molluscs is un-segmented with a distinct head, muscular foot and visceral hump.
- Symmetry: They usually show bilateral symmetry.
- Shell:
- Mantle (Pallium):
- Body wall:
- Body cavity:
- Digestive tract:
What do all molluscs have in common?
Mollusks have a hard outer shell. There is a layer of tissue called the mantle between the shell and the body. Most mollusks have tentacles for feeding and sensing, and many have a muscular foot. Mollusks also have a coelom, a complete digestive system, and specialized organs for excretion.
What are 3 characteristics of mollusks?
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.
Are molluscs intelligent?
Slimy and often sluggish they may be, but some molluscs deserve credit for their brains – which, it now appears, they managed to evolve independently, four times. The mollusc family includes the most intelligent invertebrates on the planet: octopuses, squid and cuttlefish.
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.
- tissues and organs.
- Body without cavity.
- Body possesses a through gut with mouth and anus.
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 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,…
