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