What is unique to Mollusca?
All molluscs also have gills, a mouth and an anus. 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.
What are 4 of the unique structures found in mollusks?
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 features does a Mollusca have?
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 do all Mollusca have in common?
WHAT FEATURES DO MOLLUSKS HAVE IN COMMON? As well as a shell, most mollusks have a muscular foot for creeping or burrowing. Some also have a head with sense organs. The soft body includes lungs or gills for breathing, and digestive and reproductive parts, all enclosed by a skinlike organ called the mantle.
What unique characteristics of Mollusca distinguish it from other phyla?
Molluscs have a mantle or mass of soft flesh that covers the soft body and encloses the internal organs. In many species, the mantle produces a hard shell. Not all molluscs produce a shell. Many molluscs have a radula, which, in most species, is a rasp-like scraping organ used in feeding (Fig.
What characteristics of Mollusca distinguish it from other phyla?
Mollusks all have a mantle, a shell secreted by the mantle, a visceral hump, a foot, and a radula. Mollusks are different from other phyla because they have these things, most of which are unique to the phylum Mollusca. Describe the valve of a clam. The valve of a clam is also known as each half of the clam’s shell.
Which of these class is phylum Mollusca?
Classes in Phylum Mollusca This phylum can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda.
Which of the following is included in phylum Mollusca?
The animals belonging to the phylum Mollusca are apple snail, pearl oyster, devil fish, tusk shell, etc. Hence correct answer is option A. Note: The alimentary canal of Mollusca is straight or u-shaped or coiled. They have both internal or external fertilization.
What are some examples of Mollusca?
Mollusca Examples. Following are a few examples of the animals belonging to phylum Mollusca: Pila (Apple snail) Limax (Slug) Unio (Freshwater mussel) Turbinella (Shankha) Helix (Garden snail) Octopus (Devilfish) Loligo (Squid) Key Points on Mollusca. Phylum Mollusca is the second largest phylum.
What are the features of the body structure of molluscs?
The most universal features of the body structure of molluscs are a mantle with a significant cavity used for breathing and excretion, and the organization of the nervous system.
Do mollusks have intracellular digestion?
In advanced levels either intracellular or extracellular digestion appears to be exclusively elaborated— e.g., advanced crystalline style and intracellular. Mollusks possess an open circulatory system in which body fluid ( hemolymph) is transported largely within sinuses devoid of distinct epithelial walls.
What is the feeding system of a Mollusca?
Mollusca. The “generalized” mollusc’s feeding system consists of a rasping “tongue”, the radula, and a complex digestive system in which exuded mucus and microscopic, muscle-powered “hairs” called cilia play various important roles. The generalized mollusc has two paired nerve cords, or three in bivalves.