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