What are the membrane proteins and their functions? what is the function of membrane proteins.
Contents
| 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† |
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) …
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.
- 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.
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.
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.
Classes in Phylum Mollusca This phylum can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda.
The animals belonging to the phylum Mollusca are apple snail, pearl oyster, devil fish, tusk shell, etc.
- 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)
| Arthropoda | Mollusca |
|---|---|
| Arthropods have wings to fly with jointed legs usually to their abdominal segments. | Molluscs have a muscular foot that helps in locomotion. |
Despite their diversity, mollusks share in common a three-part body plan that includes a head, a foot and a visceral mass.
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.
- They possess an exoskeleton.
- They have jointed appendages.
- Their body is segmented.
- They are bilaterally symmetrical.
- They possess an open circulatory system.
- 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:
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.
Common Name(s):mollusques [French]molusco [Portuguese]molluscs [English]mollusks [English]Taxonomic Status:
- 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.
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.
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.
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.
most molluscs have a well developed cephalization. … most others ( think clam ) are grazers, scavengers, or cephalization.
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.
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.
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.
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.
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.
The four major groups of mollusks (phyla Mollusca) are: 1) chitons; 2) gastropods, including snails, slugs (mostly marine, but some freshwater), and nudibranches.
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.
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.
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).
- 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.