The phylum Mollusca is the second-largest animal phylum, with over 100,000 species. The molluscs include many familiar animals, including clams, snails, slugs, and squid, as well as some less familiar animals, like tusk shells and chitons (Fig.
What are the membrane proteins and their functions? what is the function of membrane proteins.


What are the 5 main classes of Mollusca?

Class Major organisms
Gastropoda all snails and slugs including abalone, limpets, conch, nudibranchs, sea hares, sea butterflies
Bivalvia clams, oysters, scallops, geoducks, mussels, rudists†
Polyplacophora chitons
Cephalopoda squid, octopuses, cuttlefish, nautiluses, Spirula, belemnites†, ammonites†
What are the 8 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) …

What are the 6 molluscs?

Class Gastropoda – snails, slugs, limpets, whelks, conchs, periwinkles, etc. Class Bivalvia – clams, oysters, mussels, scallops, cockles, shipworms, etc. The Class Scaphopoda contains about 400 species of molluscs called tooth or tusk shells, all of which are marine.

What are the 3 classes of phylum Mollusca?

  • Gastropods. Gastropods include snails and slugs. They use their foot to crawl. …
  • Bivalves. Bivalves include clams, scallops, oysters, and mussels. …
  • Cephalopods. Cephalopods include the octopus and squid.
What are five characteristics of phylum Mollusca?

Molluscs (also know as mollusks) are soft-bodied, bilaterally symmetrical, segmented, coelomate animals; usually shelled having a mantle, ventral foot, anterior head, and a dorsal visceral mass.

How many mollusks are there?

Along with the insects and vertebrates, mollusks are one of the most diverse groups in the animal kingdom, with nearly 100,000 (possibly as many as 150,000) described species. This is a list of notable mollusks, ordered alphabetically by class.

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 belong to phylum Mollusca?

The animals belonging to the phylum Mollusca are apple snail, pearl oyster, devil fish, tusk shell, etc.

What is the order of Mollusca?

  • GASTROPODA (single shelled cowries, cones etc)
  • BIVALVIA ( two shelled like clams, mussels etc)
  • APLACOPHORA (solenogasters)
  • MONOPLACOPHORA (segmented limpets)
  • POLYPLACOPHORA ( or Amphineura as it was earlier called- Chitons)
  • SCAPHOPODA (tusk shells)
Do Mollusca have appendages?

Arthropoda Mollusca
Arthropods have wings to fly with jointed legs usually to their abdominal segments. Molluscs have a muscular foot that helps in locomotion.
What are the three body parts that all molluscs share?

Despite their diversity, mollusks share in common a three-part body plan that includes a head, a foot and a visceral mass.

What are the 3 classes of mollusk What do they all share how are they each different?

The three main types of mollusks are gastropods, bivalves, and cephalopods. Gastropods, like slugs and snails, can live on land or in the water. Many gastropods have beautiful spiral shells, which make them attractive to seashell hunters.

What are the characters of Arthropoda?

  • They possess an exoskeleton.
  • They have jointed appendages.
  • Their body is segmented.
  • They are bilaterally symmetrical.
  • They possess an open circulatory system.
What are 8 general characteristics of all molluscs?

  • 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:
How the members of phylum Mollusca are different from the members of phylum Annelida?

Mollusks have a coelom and several organ systems. Most also have a shell, head, foot, and radula, which is a feeding organ. Mollusks are either free-living heterotrophs or parasites. Annelids are segmented invertebrates in Phylum Annelida.

What is the common name for Mollusca?

Common Name(s):mollusques [French]molusco [Portuguese]molluscs [English]mollusks [English]Taxonomic Status:

What are 3 facts about mollusks?

  • Discover Interesting Facts About Mollusks.
  • Second largest phylum of invertebrates.
  • Some have shells, but others do not.
  • Some can live in the water, yet others are terrestrial.
  • Mollusks with shells can produce pearls.
  • Some mollusk shells were used as currency.
  • Some mollusks sting or bite.
  • Mollusks have a mantle.
Which one is representative of phylum Arthropoda?

Phylum Arthropoda is the largest phylum of Kingdom Animalia which includes insects. Examples include Apis, silkworm, Laccifer, silver fish (Lepisma), locust, etc. Puffer fish and flying fish (Exocoetus) are examples of Pisces, while cuttle fish (Sepia) belongs to Mollusca.

Which of the following animal belongs to the phylum Arthropoda?

Many familiar species belong to the phylum Arthropoda—insects, spiders, scorpions, centipedes, and millipedes on land; crabs, crayfish, shrimp, lobsters, and barnacles in water (Fig. 3.72). Arthropods are considered the most successful animals on Earth.

What is Mollusca and Arthropoda?

Mollusks are the soft-bodied invertebrates with one or two shells, whereas arthropods are the invertebrates with segmented bodies, jointed legs and appendages. … Furthermore, mollusks have mantles that secrete calcareous outer or inner shell while arthropods have an exoskeleton made up chitin.

Do phylum Mollusca have Cephalization?

most molluscs have a well developed cephalization. … most others ( think clam ) are grazers, scavengers, or cephalization.

What mollusks belong to Gastropoda?

The Class Gastropoda (in Phylum Mollusca) includes the groups pertaining to snails and slugs. The majority of gastropods have a single, usually spirally, coiled shell into which the body can be withdrawn. The shell of these creatures is often what is recovered in a fossil dig.

What are the 3 body parts that are found in every mollusk in some form what is the function of each of these body parts?

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.

What are the main parts of a mollusk In addition please define them?

Some of the qualities that define a mollusk are definite organs (mainly heart, gonads, and kidneys), a complete digestive tract, and a muscular foot. Although their bodies are not segmented, they do have two definable parts: the head and the foot. Their shells are made of calcium carbonate.

What three characteristics do all molluscs share that make them molluscs?

There are only three characteristics shared by all living mollusks: the presence of a mantle (the rear covering of the body) that secretes calcareous (e.g., calcium-containing) structures; the genitals and anus opening into the mantle cavity; and paired nerve cords.

How many classes are there in phylum Mollusca?

This phylum can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda. Class Aplacophora (“bearing no plates”) includes worm-like animals primarily found in benthic marine habitats.

What are the 4 major molluscs?

The four major groups of mollusks (phyla Mollusca) are: 1) chitons; 2) gastropods, including snails, slugs (mostly marine, but some freshwater), and nudibranches.

What are 4 characteristics of a mollusk?

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.

How many species are in phylum Arthropoda?

The Arthropoda include such familiar forms as insects, spiders, scorpions, millipedes, crabs, lobsters, shrimp, and a number of extinct groups, including the trilobites. These comprise the most diverse phylum on our planet, and there are well over one million described species.

What are the sub Phylums of phylum Arthropoda?

The phylum Arthropoda is commonly divided into four subphyla of extant forms: Chelicerata (arachnids), Crustacea (crustaceans), Hexapoda (insects and springtails), and Myriapoda (millipedes and centipedes).

What are the 4 main characteristics of arthropods?

  • A segmented body (Figure below) with a head, a thorax, and abdomen segments.
  • Appendages on at least one segment. …
  • A nervous system.
  • A hard exoskeleton made of chitin, which gives them physical protection and resistance to drying out.