Cuvier (1817) included the flatworms within Zoophyta or Radiata. Possesses a blind gut (i.e. Some may also be found in freshwater and in temperate and tropical terrestrial habitats. Phylum Platyhelminthes (Flatworms) Etymology:- From the Greek platy for flat and helminthes for worms (Hence Flat Worms) Characteristics of Platyhelminthes: Bilaterally symmetrical. ... class of flatworms containing flukes. Lamarck (1816) separated between the flatworms and roundworms. Class Turbellaria (flatworms) This group of stygobiotic flatworms includes 33 species representing 5 families and 6 genera. suckers. outermost cell layer of worm. Yes. Learn vocabulary, terms, and more with flashcards, games, and other study tools. These animals are quite literally, flat. Flatworms have bilateral symmetry Bilateral symmetry means that the animal can be divided in one plane into two, mirror images fa right and left side.) Body having 3 layers of tissues with organs and organelles. mesoderm. ... lower body surface of worm. Phylum Platyhelminthes is divided into three classes: The following classification done by Hymen based on Platyhelminthes characteristics. The largest genus, Spalloplana, is presented by 18 species found in caves, springs, seeps, and wells, primarily in the Appalachians and ILP karst regions. Mostly extinct (Lower Cambrian to Devonian), a few living species. Do class Monogenea have hooks? CLASSIII-CESTODA CLASS I: TURBELLARIA : 1. 2. ... Scheme of Classification of Phylum Platyhelminthes: ... upper with disc or branches and lower with 4 suckers. ectoderm. All members of this class have dorso-ventrally compressed bodies with high surface area to volume ratios. CLASS II-TERMATODA. Class 4. 2. The gills, skin or fins of fishes and lower aquatic invertebrates. CLASS I-TURBELLARIA . Flatworms are small, literally flat worms, which “breathe” through diffusion across the outer membrane (Figure 1). External. Mostly free - living forms found in fresh or sea waters or on land. Geographical distribution: Deep waters of Pacific and the North and South Atlantic and the Indian Ocean. Intestinal parasites of elasmobranch fishes. Vogt (1851) called flatworms as Platyelmia. Examples: 19 species have already described and included in a single family. The seven categories of biological taxonomy are Kingdom, Phylum, Class, Order, Family, Genus and Species. middle cell layer of worm. This class contains about 3000 species. Most of the flatworms in class Turbellaria are marine and benthic. Animals with bilateral symmetry have dorsal (upper and ventral (lower) sides, as well as anterior (forward or head end) and posterior (tail or hind) ends. Neopilinidae (Pechenik, 2000). Internal. Where are Monogenea commonly found? It the class Trematoda interanal or external? All living organisms belong to specific groups within these categories, most of which have already been established, and earthworms are no exception. Body contains no internal cavity. CLASSIFICATION OF PHYLUM PLATYHELMINTHES. In general, classifications with probability values of ≥0.54 tended to be correct, whereas those with lower probability values tended to be incorrect. ... Is the class Monogenea internal or external? Flatworms have one hole or a mouth which food and waste passes. A flatworm. Platyhelminthes are the flatworms, animals that are rather simple in scope but much more complex than some of the phyla that existed before them. found at the end of flukes to attach to host. Neopilina, Vema, Micropilina, Rokopella, Laevipilina. Start studying flatworms, roundworms, & rotifers. it has a mouth but no anus) Has Protonephridial excretory organs instead of an anus. The flat shape of these organisms increases the surface area for diffusion, ensuring that each cell within the body is close to the outer membrane surface and has access to oxygen.
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