the three main body parts of the phylum mollusca are a
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Molluscs A ll modern mollusks have the same fundamental body plan. There are three distinct body zones: a head-foot, a visceral mass and a mantle. Some common features are 1  : Unsegmented soft body with bilateral symmetry.
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Definitions &Translations The molluscs or mollusks /ˈmɒləsks/ compose the large phylum of invertebrate animals known as the Mollusca. Around 85,000 extant species of molluscs are recognized. Molluscs are the largest marine phylum, comprising about 23% of all the named marine organisms.Numerous molluscs also live in freshwater and terrestrial habitats.They are highly diverse, not just in size and in anatomical structure, but also in behaviour and in habitat. The phylum is typically divided into 9 or 10 taxonomic classes, of which two are entirely extinct.he brain, in species that have one, encircles the esophagus. Most molluscs have eyes, and all have sensors to detect chemicals, vibrations, and touch. The simplest type of molluscan reproductive system relies on external fertilization, but more complex variations occur.
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- This extremely diverse animal phylum is thought to contain well over 100,000 species, which include animals in the taxonomic classes Polyplacophora (chitons), Gastropoda (animals with one shell, including snails, limpets, and sea slugs/nudibranchs), Bivalvia (animals with two shells - clams, mussels and oysters) and Cephalopoda (octopuses and squids ...
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- Mollusks (Mollusca) are a group of invertebrates that includes squid, octopuses, cuttlefish, nudibranchs, snails, slugs, limpets, sea hares, mussels, clams, oysters, scallops, as well as many less well-known animals.his hypothetical mollusk has a mantle, shell, foot and visceral mass. The mantle is a layer of tissue that covers the visceral mass and in many mollusks it contains glands which secrete a hard shell. The foot is muscular structure located on the underside of the body.
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- Many mollusks have their mantle produce a calcium carbonate external shell and their gill extracts oxygen from the water and disposes waste. All species of the phylum Mollusca have a complete digestive tract that starts from the mouth to the anus.Many have a feeding structure, the radula, mostly composed of chitin.he appendages of a starfish are called arms. Starfish typically  have five arms (also called rays) but depending on the species they  can have as few as three or as many as … fifty.
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- Octopus Body Plan. ­The octopus belongs to the phylum mollusca, where you will also find its slimy next of kin, the clams, snails and slugs. But octopuses are separated from the mollusks into the class cephalopoda, which includes the most advanced animals of the phylum.
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All about the name John The meaning of the name John is God Is Gracious. The origin of the name John is Hebrew. This is the culture in which the name originated, or in the case of a word, the language. John F. Kennedy, 35th U.S. President. John Travolta, actor.
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- Mollusca. (məlŭs`kə) , taxonomic name for the one of the largest phyla of invertebrate animals (Arthropoda is the largest) comprising more than 50,000 living mollusk species and about 35,000 fossil species dating back to the Cambrian period. Mollusks are soft-bodied, and most have a prominent shell.he Mollusca constitute a successful phylum; there are probably over 110,000 living species of mollusks, a number second only to that of the phylum Arthropoda, and more than double the number of vertebrate species.
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Bivalves: Phylum Mollusca, Class Bivalvia Bivalves: Phylum Mollusca, Class Bivalvia. Clams, mussels, oysters, and scallops are members to the class Bivalvia (or Pelecypodia). Bivalves have two shells, connected by a flexible ligament, which encase and shield the soft vulnerable parts of the creature.ivalves: Phylum Mollusca, Class Bivalvia. Clams, mussels, oysters, and scallops are members to the class Bivalvia (or Pelecypodia). Bivalves have two shells, connected by a flexible ligament, which encase and shield the soft vulnerable parts of the creature.
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- The phylum Mollusca is divided into seven distinct extant classes, three of which (Gastropoda, Bivalvia, and Cephalopoda) are of major significance in terms both of species numbers and of ecological bioenergetics, and one extinct class.
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Mollusca The molluscs or mollusks /ˈmɒləsks/ compose the large phylum of invertebrate animals known as the Mollusca. Around 85,000 extant species of molluscs are recognized. Molluscs are the largest marine phylum, comprising about 23% of all the named marine organisms.Numerous molluscs also live in freshwater and terrestrial habitats.They are highly diverse, not just in size and in anatomical structure, but also in behaviour and in habitat. The phylum is typically divided into 9 or 10 taxonomic classes, of which two are entirely extinct.ost molluscs have only one pair of gills, or even only one gill. Generally, the gills are rather like feathers in shape, although some species have gills with filaments on only one side. They divide the mantle cavity so water enters near the bottom and exits near the top.
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- At the seashore animals will be from the Animal Kingdom in these phyla. 1  Phylum: Mollusks (Soft-bodied animals that sometimes have a hard shell. 2  Includes: snails, octopus, squid, clams, oysters, and mussels.). 3  Phylum: Echinoderms (Often spiny animals, with several arms reaching out from the center of its body.
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Mollusca The following are present in all modern molluscs: 1  The dorsal part of the body wall is a mantle (or pallium) which secretes calcareous spicules, plates or shells. 2  The anus and genitals open into the mantle cavity. 3  There are two pairs of main nerve cords.
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- Scientists estimate that there are more than 100,000 species of mollusks alive today. This makes them the second largest phylum of animals, having fewer species than only the arthropods. Mollusks have soft bodies that consist of three basic parts: a foot, a visceral mass and a mantle.his hypothetical mollusk has a mantle, shell, foot and visceral mass. The mantle is a layer of tissue that covers the visceral mass and in many mollusks it contains glands which secrete a hard shell. The foot is muscular structure located on the underside of the body.
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Mollusca Phylum: <b>Mollusca</b><br /><br /> Mollusca <br /><br /> A major phylum of the animal kingdom comprising an extreme diversity of external body forms (oysters, clams, chitons, snails, slugs, squid, and octopuses among others), all based on a remarkably uniform basic plan of structure and function.
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- Phylum AnnelidaSegmented WormsCharacteristics-Segmentation-Chaetae (Hairs made of Chitin- 3 Cell Layers-True Coelom-Head develops first (Protostomal) Annelida Has 3 Major Classes1.Polychaeta (Poly – keet-a) a. Poly = Many, Chaetae = hairs 2.Oligochaeta (Oligo – keet – a)a. Oligo = few 3. Hirudinea a.hylum AnnelidaSegmented WormsCharacteristics-Segmentation-Chaetae (Hairs made of Chitin- 3 Cell Layers-True Coelom-Head develops first (Protostomal) Annelida Has 3 Major Classes1.
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- All these animals are characterised by a tough outer body-shell or exoskeleton, with flexible joints between the skeletal plates to allow the animal to move. The main external body features which distinguish each of the four major Classes of living arthropods, Crustacea, Myriapoda, Arachnida and Insecta, are shown below (with those that separate the insects from all other groups highlighted in red).
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- Most molluscan species are readily recognizable as such. The Mollusca constitute a successful phylum; there are probably over 110,000 living species of mollusks, a number second only to that of the phylum Arthropoda, and more than double the number of vertebrate species.More than 99% of living molluscan species belong to two classes: Gastropoda (snails) and Bivalvia.ost molluscan species are readily recognizable as such. The Mollusca constitute a successful phylum; there are probably over 110,000 living species of mollusks, a number second only to that of the phylum Arthropoda, and more than double the number of vertebrate species.
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- Molluscs include such familiar creatures as clams, oysters, snails, and octopi. They share a distant common ancestor with the annelid worms, an evolutionary heritage suggested by their larval form, called a trochophore larva, found in all molluscs and in certain marine annelids called polychaete worms.rotostomes like molluscs, annelids, and arthropods develop by spiral cleavage, and their embryonic cells are determinate, the fate of the embryonic cells is fixed very early on in development. The protostome coelom forms from a split within the mesoderm tissue, so they are sometimes refereed to as schizocoels.
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- In general, mollusks have a soft body with a discernible head and foot region, and a hard exoskeleton in the form of a shell or plate. Mollusks are ubiquitous in both marine and terrestrial environments, and range in size from smaller than one millimeter to twenty meters long. There are eight classes in the phylum Mollusca. The focus of this discussion is on three of the five classes in the subphylum Conchifera, or shell-bearing mollusks. Three classes in Conchifera with an important presence in the Gulf of Mexico are Gastropoda, Cephalopoda, and Bivalvia.
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- The molluscs or mollusks /ˈmɒləsks/ compose the large phylum of invertebrate animals known as the Mollusca. Around 85,000 extant species of molluscs are recognized. Molluscs are the largest marine phylum, comprising about 23% of all the named marine organisms.he molluscs or mollusks /ˈmɒləsks/ compose the large phylum of invertebrate animals known as the Mollusca. Around 85,000 extant species of molluscs are recognized. Molluscs are the largest marine phylum, comprising about 23% of all the named marine organisms.
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What Is the Meaning of Mollusca? Mollusca, meaning “soft-bodied,” is one of the largest phylums in the animal kingdom. The word mollusc (or mollusk) derives from the Latin word “mollis,” which means “soft.” There are an estimated 200,000 species of mollusk worldwide accounting for nearly a quarter of all marine life.
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Annelid Annelids are considered members of the Lophotrochozoa, a super-phylum of protostomes that also includes molluscs, brachiopods, flatworms and nemerteans. The basic annelid form consists of multiple segments.Each segment has the same sets of organs and, in most polychaetes, has a pair of parapodia that many species use for locomotion.nnelids are considered members of the Lophotrochozoa, a super-phylum of protostomes that also includes molluscs, brachiopods, flatworms and nemerteans. The basic annelid form consists of multiple segments.
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- We will examine fourclasses of mollusks as representatives of the phylum: (1)Polyplacophora—chitons; (2) Gastropoda—snails, slugs,limpets, and their relatives; (3) Bivalvia—clams, oysters,scallops, and their relatives; and (4) Cephalopoda—squids,octopuses, cuttlefishes, and nautilus.
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3 Main Classes of Phylum Porifera The following points highlight the three main classes of Phylum Porifera. The three classes are: 1. Calcarea or Calcispongiae— (Calcareous Sponges) 2. Hexactinellida or Triaxonida or Hyalospongiae—(Glass Sponge) 3. Demospongiae. Phylum Porifera: Class # 1. Calcarea or Calcispongiae— (Calcareous Sponges):