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 Bedford's Flatworm, Pseudobiceros bedfordi
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The Platyzoa (pronounced /ˌplætɨˈzoʊə/) are a group of protostome animals proposed by Thomas Cavalier-Smith in 1998. Eumetazoa is a Clade comprising all major Animal groups except sponges Characteristics of eumetazoans include true tissues organized into The Bilateria (ˌbaɪləˈtɪəriə are all animals having a bilateral symmetry, i Professor Thomas (Tom Cavalier-Smith (born October 21 1942) FRS, FRSC, NERC Professorial Fellow is a Professor of The flatworms (Phylum Platyhelminthes from the Greek πλατύ platy, meaning "flat" and ἕλμινς (root ἑλμινθ- helminth- The gastrotrichs (from Greek γαστερ gaster "stomach" and θριξ thrix "hair" are a phylum of microscopic (0 The rotifers make up a Phylum of microscopic and near-microscopic pseudocoelomate Animals They were first described by Rev The Acanthocephala ( Greek ακανθος akanthos, thorn + κεφαλη kephale, head is a phylum of Parasitic worms known as Gnathostomulids, or jaw worms, are a small phylum of nearly microscopic marine Animals Most measure between 0 Limnognathia maerski is a microscopic animal discovered living in homothermic springs on Disko Island, Greenland in 1994 that was given Symbion is the name of a Genus of aquatic animals less than ½ mm wide found living attached to the bodies of cold-water lobsters Protostomia (from the Greek: mouth first) are a Taxon of Animals Together with the Deuterostomes and a few smaller phyla Professor Thomas (Tom Cavalier-Smith (born October 21 1942) FRS, FRSC, NERC Professorial Fellow is a Professor of Cavalier-Smith included in Platyzoa the Phylum Platyhelminthes or flatworms, and a new phylum, Acanthognatha, into which he gathered several previously described phyla of microscopic animals. A phylum ( Plural: phyla) is a Taxonomic rank between Kingdom and above Class. The flatworms (Phylum Platyhelminthes from the Greek πλατύ platy, meaning "flat" and ἕλμινς (root ἑλμινθ- helminth- The flatworms (Phylum Platyhelminthes from the Greek πλατύ platy, meaning "flat" and ἕλμινς (root ἑλμινθ- helminth- Subsequent studies have supported Platyzoa as a clade, a monophyletic group of organisms with a common ancestor, while differing on the phyla included and on relationships within Platyzoa. A clade is a taxonomic group comprising a single Common ancestor and all the descendants of that ancestor A clade is a taxonomic group comprising a single Common ancestor and all the descendants of that ancestor
One current scheme places the following traditional phyla in Platyzoa:
The Platyhelminthes and Gastrotricha are acoelomate. The flatworms (Phylum Platyhelminthes from the Greek πλατύ platy, meaning "flat" and ἕλμινς (root ἑλμινθ- helminth- The gastrotrichs (from Greek γαστερ gaster "stomach" and θριξ thrix "hair" are a phylum of microscopic (0 The rotifers make up a Phylum of microscopic and near-microscopic pseudocoelomate Animals They were first described by Rev The Acanthocephala ( Greek ακανθος akanthos, thorn + κεφαλη kephale, head is a phylum of Parasitic worms known as Gnathostomulids, or jaw worms, are a small phylum of nearly microscopic marine Animals Most measure between 0 Limnognathia maerski is a microscopic animal discovered living in homothermic springs on Disko Island, Greenland in 1994 that was given Symbion is the name of a Genus of aquatic animals less than ½ mm wide found living attached to the bodies of cold-water lobsters By the broadest definition a body cavity is any fluid filled space in a Multicellular organism. The other phyla have a pseudocoel, and share characteristics such as the structure of their jaws and pharynx, although these have been secondarily lost in the parasitic Acanthocephala. By the broadest definition a body cavity is any fluid filled space in a Multicellular organism. The pharynx (plural pharynges) is the part of the Neck and Throat situated immediately Posterior to (behind the Mouth and Nasal Parasitism is a type of symbiotic relationship between Organisms of different Species. They form a monophyletic subgroup called the Gnathifera.
The Platyzoa are close relatives of the Lophotrochozoa, and are sometimes included in that group. The Lophotrochozoa (ləˌfɒtroʊkəˈzoʊə "crest-bearing animals" are one of three major groupings of Protostome animals Together the two make up the Spiralia.
References
- The Taxonomicon - Taxon: Infrakingdom Platyzoa Cavalier-Smith, 1998 - retrieved January 31, 2006
- The interrelationships of metazoan parasites: a review of phylum- and higher-level hypotheses from recent morphological and molecular phylogenetic analyses - retrieved January 31, 2006
- Triploblastic Relationships with Emphasis on the Acoelomates and the Position of Gnathostomulida, Cycliophora, Plathelminthes, and Chaetognatha: A Combined Approach of 18S rDNA Sequences and Morphology - retrieved January 31, 2006
- Myzostomida Are Not Annelids: Molecular and Morphological Support for a Clade of Animals with Anterior Sperm Flagella - retrieved January 31, 2006
- Current advances in the phylogenetic reconstruction of metazoan evolution. A new paradigm for the Cambrian explosion? - retrieved January 31, 2006
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