Phylum mollusca caracteristicas pdf

Itis taxonomy is based on the latest scientific consensus available, and is provided as a general reference source for interested parties. Many organisms belonging to this phylum have a calciferous shell. Along with the insects and vertebrates, it is one of the most diverse groups in the animal kingdom, with nearly 100,000 possibly as many as 150,000 described species. Wormlike marine surface dwellers class polyplacophora950 sp. Flattened with dorsal segmented shell class monoplacophora25 sp. Mollusca caudofoveates, solanogastres, chitons, monoplacophorans, scaphopods, bivalves, gastropods, cephalopods common name. Morphological hypotheses generally placed the caudofoveata and solenogastres as plesiomorphic based on their simple wormlike body plan and lack of a shell kocot et al. 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. The body is divided into head, muscular foot and visceral mass. Cuttlefish meaning of the name unique characteristics the meaning of phyllum mollusca comes from the latin word mollusk which means soft of body.

Wormlike marine burrowers class solenogastres250 sp. Synopsis of phylum mollusca molluscs identifying characteristics of phylum. Phylum mollusca is a very diverse 85,000 species group of mostly marine species. Mollusca is the secondlargest phylum of invertebrate animals after the arthropoda. Descargue como pdf, txt o lea en linea desde scribd. Ruppert and barnes 1994, meglitsch and schram 1991 divided molusca into 7 classes, while parker and haswell 1972, morton and yonge 1964 have clubbed class. Nov 14, 2016 zoology phylum mollusca hillary wilson. In this article we will discuss about the general characters and classification of phylum mollusca. Caracteristicas generales del phylum mollusca moluscos. It includes such familiar organisms as snails, octopuses, squid, clams, scallops, oysters, and chitons. Prothero, 1998, bringing fossils to life, mcgrawhill, p. Caracteristicas generales del phylum mollusca moluscos branquia.

Mollusca is the second largest phylum of invertebrate animals. Mollusk, also spelled mollusc, any softbodied invertebrate of the phylum mollusca, usually wholly or partly enclosed in a calcium carbonate shell secreted by a soft mantle covering the body. They can be found in terrestrial regions as well as in the depths of the seas. Most gastropod shells, especially from the paleozoic, are preserved as internal. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Some people use the term mollusk for a member of phylum mollusca, whereas others use the term mollusc. The latter, because it is more like the spelling of the formal name of the phylum, is easier to remember. Hours to centuriesthe oldest is known to have lived over 500 years diet. Mollusk, any softbodied invertebrate of the phylum mollusca, usually wholly or partly enclosed in a calcium carbonate shell secreted by a soft mantle covering the body.

Over 50,000 of these species belong to the mostly marine and freshwater caenogastropoda while another 20,000 species belong to the subclass pulmonata, of which most are terrestrial. Home interesting facts contact reproduction and circulatory system body plan and symmetry shells jokes for the folks interesting facts 1. Oysters radula tounge like organ with rows of teeth. The phylum mollusca consists of over 100,000 marine, freshwater, and terrestrial species. Mollusca is one of the most diverse groups of animals on the planet, with at least 50,000 living species and more likely around 200,000. Relationships of mollusca evolutionary hypotheses for the major groups of molluscs are controversial largely because of the extreme diversity in the phylum. You will be amazed to know that the size of the molluscans can range from 20 metres to one millimetre, with a few microscopic animals too. Brusca and others published phylum mollusca find, read and cite all the research you need on researchgate.

In any case, both terms are pronounced the same way. Flattened with dorsal complete shell class gastropoda35 000 sp. Structure soft bodied animals name from latin word mollus meaning soft most are protected by a hard shell made of calcium carbonate have a reduced internal cell or have lost the shell completely during evolution. Some also serve as intermediate hosts for parasitic trematodes, and. Consist of three basic parts, a foot, a visceral mass, and a mantle bilaterally symmetrical. However, it is not a legal authority for statutory or regulatory purposes. A few molluscs such as unio possess green glands which mimic the liver in vertebrates. There are six classes of which three are more prominent.

Mollusks are the largest marine phylum, comprising about 23% of all the named marine organisms. Phylum mollusca article about phylum mollusca by the free. Mollusks better known as snails,clams, and other relatives all mollusks have soft bodies their name is derived from the latin word mollus meaning soft. Zhiqiang 2011 estima 117 358 especies descritas en una clasificacion evolutivadescriptiva.

The word mollusc comes from the latin word mollis, which means soft. Today well be looking at a wellknown, large phylum of invertebrate animals, called mollusca whose members are most often referred to as molluscs, of which around 85,000 extant species are recognised. Page designed through the cooperative efforts of interagency itis teams. 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.

The body of molluscs is unsegmented with a distinct head, muscular foot and visceral hump. Gastropods are the most diverse class of the phylum mollusca, comprising almost three quarters of the 110,000 or so species of molluscs known. Introductionmollusca is the latinfor softincludes snails, squids,nautilus, octopus,clams, etc. Phylum mollusca bio 2215 oklahoma city community college dennis anderson phylum mollusca numbers of species molluscs 50,000 100,000 living species 35,000 extinct species largest pounds 80% less than 5 cm soft body most have a shell most marine snails terrestrial most habitat phylum mollusca ventral foot locomotion mantle encloses mantle cavity shell radula coelom eucoelomate. What are the four most common and diverse classes of molluscs. Molluscs are found in nearly all freshwater and marine.

Animales protostomos celomados, con simetria bilateral o secundariamente asimetricos y no. The proportion of undescribed species is very high. Phylum mollusca characteristics, classification and examples. Some also serve as intermediate hosts for parasitic trematodes, and others e. Around 85,000 extant species of molluscs are recognized. Spiny skinned greek marine animals with 5 point radial pentaradial symmetry as adults. Many, however, occur in fresh water and some even in damp soil. Echinoderms have an endoskeleton of calcite plates ossicles, each of which is a single stereom crystal. Along with the insects and vertebrates, it is one of the most diverse groups in the animal kingdom, with nearly 100,000 possibly. Phylum mollusca bio 2215 oklahoma city community college dennis anderson phylum mollusca numbers of species molluscs 50,000 100,000 living species 35,000 extinct species largest pounds 80% less than 5 cm soft body most have a shell most marine snails terrestrial most habitat phylum mollusca ventral foot locomotion mantle encloses mantle cavity shell radula coelom. Phylum mollusca has been classified differently by different authors depending upon the characters of foot, mantle, shell, muscles, radula, nervous system and respiratory organs. Jun 11, 2017 the body is divided into head, muscular foot and visceral mass.

They possess osphradia to test the chemical nature of water. Currently there are an estimated 75 thousand species, plus 35 thousand species in the fossil record. The phylum mollusca is the secondlargest animal phylum, with over 100,000 species. To view subspecies, varieties and populations select the species. While every effort has been made to provide the most reliable and uptodate information available, ultimate legal requirements with respect to species are contained in. Mollusks live in marine, freshwater and terrestrial. Mollusks are the second largest phylum in the animal kingdom after the phylum arthropoda. Phylum mollusca and biological diversity and evolution through time. The number of fossil species is estimated between 60,000 and 100,000 additional species. Mollusca medical definition merriamwebster medical. Other than worm like classes, all descended from ham. Mollusks have a dramatic variety of form, ranging from large predatory squids and octopus, some of which show a high degree of intelligence, to grazing forms with elaborately sculpted and colored shells. Hosted by the usgs core science analytics and synthesis. The bodies are generally very soft and are covered by the hard exoskeleton.