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Encyclopedia > Metazoa
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Metazoan Animals
Aphthona flava flea beetle.
Aphthona flava - flea beetle
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Subkingdom: Metazoa
Phyla

Metazoa usually refers to the animals with numerous cells which are arranged in layers or groups resulting in the formation of organs, fully differentiated tissues, including nerves and muscles. Different cells here can follow different lines of specialization to perform various functions. Characteristic of metazoa is the process of embryonic development by which the fertilized egg passes through a series of changes culminating in the formation of the adult. This includes all the animal phyla except the sponges, Trichoplax, and certain parasites. In older texts, Metazoa is often taken to be synonymous with our Animalia, excluding only the protozoa. It may be formalized as a subkingdom, but its treatment varies considerably. Metazoa are distinguished from other Animalia in that they can perform apoptosis. This is a biological recognition that cell differentation is essential to these organisms. Image File history File links Information_icon. ... Download high resolution version (640x953, 86 KB)Aphthona flava flea beetle feeding on leafy spurge. ... For other uses, see Scientific classification (disambiguation). ... Kingdoms Animalia - Animals Fungi Plantae - Plants Protista A eukaryote (IPA: ) is an organism with a complex cell or cells, in which the genetic material is organized into a membrane-bound nucleus or nuclei. ... Animalia redirects here. ... Scientific classification or biological classification refers to how biologists group and categorize extinct and living species of organisms. ... Phyla Cnidaria Ctenophora The Radiata are the radially symmetric animals of the Eumetazoa subregnum. ... Classes Anthozoa - Corals and sea anemones Scyphozoa - Jellyfish Staurozoa - Stalked jellyfish Cubozoa - Sea wasps or box jellyfish Polypodiozoa Hydrozoa - Hydroids, hydra-like animals Cnidaria (silent c - pronounced // from New Latin cnida, fr. ... Classes Tentaculata Nuda Ctenophores are jellyfish-like animals commonly called comb jellies, sea gooseberries, sea walnuts, or Venus girdles. ... Illustration of the different types of symmetry of Life Forms On Earth. ... Phyla Mollusca Arthropoda Annelida Protostomes (from the Greek: first the mouth) are a superphylum of animals in the taxonomic group bilateria, and include animals such as arthropods, mollusks, and nematodes. ... The Acoelomorpha are a phylum of animals formerly considered flatworms, but now known to be a separate group, basal among the Bilateria. ... Classes Monogenea Trematoda Cestoda Turbellaria The flatworms (Platyhelminthes, Greek platy: flat; helminth: worm) are a phylum of relatively simple soft-bodied invertebrate animals. ... Orders Anopla Enopla The phylum Nemertina (or Nemertea, occasionally Nemertini) contains the ribbon worms or proboscis worms, which are a group of unsegmented marine invertebrates. ... The gastrotrichs are a phylum of microscopic animals, found in fresh water and marine environments. ... Gnathostomulids, or jaw worms, are a small phylum of microscopic marine animals. ... Binomial name Limnognathia maerski Kristensen & Funch, 2000 Limnognathia maerski is a microscopic animal, discovered in Greenland in 2000, that is given its own phylum, Micrognathozoa. ... Classes Seisonoidea Bdelloidea Monogononta The rotifers make up a phylum of microscopic, pseudocoelomate animals. ... Classes Archiacanthocephala Palaeacanthocephala Eoacanthocephala The Acanthocephala (gr. ... Priapulida (priapulid worms, or penis worms) are a phylum of marine worms with an extensible spiny proboscis. ... Orders Cyclorhagida Homalorhagida Kinorhyncha (Gr. ... Loricifera is a small phylum of marine sediment-dwelling animals with about a dozen known species. ... Orders Barentsiidae (Urnatellidae) Loxokalypodidae Loxosomatidae Pedicellinidae Entoprocta (Gr. ... Classes Adenophora    Subclass Enoplia    Subclass Chromadoria Secernentea    Subclass Rhabditia    Subclass Spiruria    Subclass Diplogasteria The roundworms (Phylum Nematoda) are one of the most common phyla of animals, with over 20,000 different described species. ... Classes Nectonematoida Gordioidea Nematomorpha (sometimes called Gordiacea, and commonly known as horsehair worms or Gordian worms) are a phylum of parasitic animals which are morphologically and ecologically similar to nematode worms, hence the name. ... Binomial name Symbion pandora Funch & Kristensen, 1995 Symbion is a genus of peculiar animals, with a single species, . It was discovered in 1995 by Reinhardt Kristensen and Peter Funch on the mouthparts of the Norwegian lobster Nephrops norvegicus. ... Classes Caudofoveata Aplacophora Polyplacophora Monoplacophora Bivalvia Scaphopoda Gastropoda Cephalopoda † Rostroconchia The mollusks or molluscs are the large and diverse phylum Mollusca, which includes a variety of familiar creatures well-known for their decorative shells or as seafood. ... The Sipuncula, sipunculid worms or peanut worms, are a phylum of marine worms with a tentacle surrounded mouth on a completely invertible head end. ... Classes and subclasses Class Polychaeta (paraphyletic?) Class Clitellata    Oligochaeta - Earthworms and others    Acanthobdellida    Branchiobdellida    Hirudinea - Leeches Class Myzostomida Class Archiannelida (polyphyletic) Class Echiura *Some authors consider the subclasses under Clitellata to be classes The annelids, collectively called Annelida, are a large phylum of animals, comprising the segmented worms, with about... Classes Heterotardigrada Mesotardigrada Eutardigrada Tardigrades (Tardigrada), or water bears, are a phylum of small, segmented animals, similar and related to the Arthropods. ... Genera Peripatus . ... Subphyla and Classes Subphylum Trilobitomorpha Trilobita - trilobites (extinct) Subphylum Chelicerata Arachnida - spiders,scorpions, etc. ... Genera Phoronis Phoronopsis Phoronids (Phoronida) are a relatively small animal phylum: twelve species are known, in two genera, Phoronis and Phoronopsis. ... Classes Phylactolaemata Stenolaemata Gymnolaemata The Ectoprocta are a phylum of lophophorate animals. ... Classes Lingulata Paterinata (extinct) Craniforma Chileata (extinct) Obolellata (extinct) Kutorginata (extinct) Strophomenata (extinct) Rhynchonellata Brachiopods (from Latin bracchium, arm + New Latin -poda, foot) make up one of the major animal phyla, Brachiopoda. ... Phyla Chaetognatha Echinodermata Hemichordata Chordata Deuterostomes (from the Greek: second the mouth) are one of the two superphyla of animals in the taxonomic branch bilateria, the other being the protostomes. ... Classes Asteroidea Concentricycloidea Crinoidea Echinoidea Holothuroidea Ophiuroidea Echinoderms (Echinodermata) is a phylum of marine animals found in the ocean at all depths. ... Classes Archisagittoidea Sagittoidea Chaetognatha is a phylum of predatory marine worms that are a major component of plankton worldwide. ... Classes Enterepneusta Pterobranchia Planctosphaeroidea Hemichordata is a phylum of worm-shaped marine deuterostome animals, generally considered the sister group of our own, the chordates. ... {{{subdivision_ranks}}} See below Chordates (phylum Chordata) are a group of animals that includes the vertebrates, together with several closely related invertebrates. ... Classes Calcarea Hexactinellida Demospongiae The sponges or poriferans (from the Greek poros pore and ferro to bear) are animals of the phylum Porifera. ... Binomial name Trichoplax adhaerens F.E. von Schultze, 1883 Trichoplax adhaerens is a simple balloon-like marine animal with a body cavity filled with pressurized fluid. ... Wikisource has an original article from the 1911 Encyclopædia Britannica about: Protozoa Protozoa (in Greek proto = first and zoa = animals) are single-celled eukaryotes (organisms whose cells have nuclei) that commonly show characteristics usually associated with animals, most notably mobility and heterotrophy. ... Phyla Subkingdom Parazoa Porifera (sponges) Subkingdom Agnotozoa Placozoa Orthonectida Rhombozoa Subkingdom Metazoa Radiata Cnidaria Ctenophora - Comb jellies Bilateria Protostomia Acoelomorpha Platyhelminthes - Flatworms Nemertina - Ribbon worms Gastrotricha Gnathostomulida - Jawed worms Micrognathozoa Rotifera - Rotifers Acanthocephala Priapulida Kinorhyncha Loricifera Entoprocta Nematoda - Roundworms Nematomorpha - Horsehair worms Cycliophora Mollusca - Mollusks Sipuncula - Peanut worms Annelida - Segmented... A cell undergoing apoptosis. ...


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VI The Cambrian explosion (2953 words)
Metazoa Cambrian radiation constitutes one of the history of the live most significant events with the apparition of most of the plans of organization associated with the most essential innovations with the living organisms (mineralized skeletons, intestines, jaws, gills, etc...)..
a) Intrinsic causes: genetic flexibility, metazoa Hox genes complexification (1 in the sponges, 6 in the flies, 8 in the arthropods, 38 in the mammals...
The influence of the level of stimulus molecular free oxygen in atmosphere or dissolved in the oceans is of primary importance in the living organisms physiology and morphology and in particular of the metazoa.
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