- 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 characteristics do all mollusks share that separate this phylum from other phyla in the kingdom Animalia? Mollusks all have
a mantle
, a shell secreted by the mantle, a visceral hump, a foot, and a radula.
What are the 3 main parts that all mollusks have in common?
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 structure is found only in molluscs?
There are also two unusual organs that are found exclusively in mollusks:
the mantle and the radula
. These organs do not persist in higher organisms, but they were important adaptations to the environments inhabited by mollusks.
What are 3 characteristics of 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.
Do mollusks have a digestive system?
Clams (and all mollusks)
have a complete digestive system
. It consists of a mouth where food is ingested, a short connecting tube called the esophogus, a stomach which temporarily holds food, and an intestine where food digestion and absorption takes place. … Food is distributed to the cells of the body by blood.
What makes mollusks unique?
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
. … The buccal cavity, at the anterior of the mollusc, contains a radula (lost in bivalves) — a ribbon of teeth supported by an odontophore, a muscular structure.
Do all molluscs have a mantle?
All mollusks have
a thin layer of tissue
called a mantle which covers their internal organs. The mantle produces the mollusk’s shell. Clams, oysters, snails, and octopuses are all mollusks.
- 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).
Do mollusks have brains?
Molluscs, with the exception of the most highly developed cephalopods,
have no brain in the strict sense of the word
. Instead, the cell bodies (pericarya) of nerve cells are concentrated in nerve knots (ganglia) in important parts of the body. … In gastropods, the ganglia originally have been dispersed over the body.
Is a jellyfish a mollusc?
question_answer Answers(2)
Ans:
Phylum mollusca
include soft bodied animals with hard shell Eg: snails, octopus, mussels, oysters. Phylum Coelenterata contain special structure called coelenteron where the food digested.It include jelly fish and sea anemones.
Do mollusks have organs?
Most mollusk have two organs that are unique to this phylum: a
specialized feeding organ called a radula and a dorsal layer of tissue called a mantle
. … The excretory system of mollusks is made up of tubular organs called nephridia that filter waste from internal body fluids.
What are 5 characteristics of mollusks?
- 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.
How do you classify molluscs?
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.
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) …
Do squids have a complete digestive system?
Digestive System The organs of digestion in squid include the jaws, radula,
salivary glands, esophagus, liver, stomach, intestine, and anus
.
