Phylum of parasitic worms known as acanthocephalans, thorny-headed worms, or spiny-headed worms, characterized by the presence of an eversible proboscis, armed with spines, which it uses to pierce and hold the gut wall of its host. B) Platyhelminthes. Platyhelminthes. Wednesday, July 14, 2010 *EVOLUTION TREE* Phylum Platyhelminthes: Flatworms-Flatted dorsoventrally-Characterized by the tissue level of organization and a sac body plan-acoelomates with three germ layers, and have al lorgans except respiratory and circulatory organs-flat body facilitates diffusion of oxygen and other molecules from cell to cell-live in marine, freshwater, and damp … The Phylum Platyhelminthes include organisms known as flatworms. This also means they have a head and a tail (anterior-posterior axis) as well as a belly and a back (ventral-dorsal axis). A … (b) The parasitic class Monogenea includes Dactylogyrus spp. This phylum includes 13,000 species. The flatworms, flat worms, Platyhelminthes, Plathelminthes, or platyhelminths (from the Greek platy, meaning “flat” and helminth-, meaning “worm”) are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates. Platyhelminthes and flatworms mean one and same type of worms. The alimentary canal is distinct, with the mouth and the anus. They are sexually … Body having 3 layers of tissues with organs and organelles. PowerPoint Presentation : Session Objectives. 2. B) They all have jointed appendages and a radula. 38. c) flatworms, triploblastic , coelomates. The organisms are also known as flatworms. Class Turbellaria comprises flatworms that are ciliated and free living, whereas members of class monogea are ectoparasitic (live outside the host body) and constitute monogenetic flukes. They have a definite congregation of of sensory organs(a few have light sensing organs) and nervous tissues at one end of their body giving them a distinct head and tail. Form fibrous nodules called pseudotubules. back 39. Characteristics of Animal Kingdom: back 38. heterotrophic, multicellular organisms. What animal does not have tissues, organs or organ systems? e phylum Platyhelminthes or atworms represent one of the most diverse groups within Lophotrochozoa with about , species distributed worldwide including free-living and parasitic organism classi ed into major groups [ ,]. All have the following characteristics: bilateral symmetry, organs embedded in a solid cellular matrix (the parenchyma), a sac … Because there is no cavity that surrounds the endoderm (digestive system), flatworms do not … Some of the phyla classified as Lophotrochozoa may be missing one or both of these defining structures. b) single … The flatworms are acoelomate organisms that include many free-living and parasitic forms. They are bilaterally symmetrical, nonsegmented, dorsoventrally flattened worms characterized by lack of coelom, anus, circulatory and respiratory systems, and exo- or endoskeleton. E) Porifera. The free living forms occur in both fresh water and marine habitats. “Turbellaria” includes an amazing variety of forms, but built in a similar way. The bilateria / b aɪ l ə ˈ t ɪər i ə / or bilaterians are animals with bilateral symmetry as an embryo, i.e. Sponges. … Along with its bilateral body, the Platyhelmthes has an anterior, posterior, dorsal, and ventral end. Characteristics of Platyhelminthes. 8. Annelida is derived from Latin word ‘anellus’ meaning little ring. Dactylogyrus, commonly called a gill fluke, is about 0.2 mm in length and has two anchors, indicated by arrows, that it uses to latch onto the gills of host fish. Among them, Polychaetes constitute about 12,000 species while Clitellates contains about 10,000 species. These are acoelomates and they include many free-living and parasitic life forms. Possesses a blind gut (i.e. a) flatworms, triploblastic , acoelomate animals. b) flatworms, diploblastic , acoelomates. Linnaeus had little time for worms, pooling them with other invertebrates into the group ‘Vermes'. Following are the important characteristics of Nematoda: Their body is bilaterally symmetrical and triploblastic. Phylum … D) Nematoda. All these acoelomate worms have bilateral symmetry; they are hermaphrodite with some exceptions and have a simple centralized nervous system and a mesodermal germ layer [ , ]. The brain of the active, … Phylum Platyhelminthes belongs to kingdom Animalia. Phylum Platyhelminthes (Flatworms) Etymology:- From the Greek platy for flat and helminthes for worms (Hence Flat Worms) Characteristics of Platyhelminthes: Bilaterally symmetrical. What animal does not have tissues, organs or organ systems? Phylum Platyhelminthes has following characteristic features: (1) Free-living, commensal or parasitic forms. Sensory nerves leave the brain and run forward into the prostomium (extreme anterior end) and first segment. The Catenulida, or “chain worms” is a small clade of just over 100 species. Phylum Platyhelminthes comprises 34,000 known species which are categorized under four classes: Turbellaria, Monogea, Trematoda, and Cestoda. They are cylindrical in shape. Nearly all are bilaterally symmetrical as adults as well; the most notable exception is the echinoderms, which achieve … They exhibit tissue level organization. Multiple Choice Questions on Phylum Platyhelminthes 1. Platyhelminthes or flatworms are dorsoventrally flattened bilaterally symmetrical tripoblastic but acoelomate animals which have a blind sac body plan.There are about 13,000 species, most of which are parasitic, a few commensal or free living. Figure 2. Commonly known as flatworms, these invertebrate animals are unsegmented worms with bilateral symmetry. 39. Characteristics of Sponges: Heterotrophic, filter feeders, asexual reproduction (budding), no tissues, … While some species are microscopic in size, others measure several feet in length. Flatworm, also called platyhelminth, any of the phylum Platyhelminthes, a group of soft-bodied, usually much flattened invertebrates. The phylogenomic analyses unambiguously … As the name reveals, these worms are usually thin, ribbonlike and dorsoventrally flattened. This phylum consists of about 80,000 parasitic worms. Turbellaria, Trematoda, and … These … Members of this Phylum (Planaria, tapeworms and flukes) are dorsoventrally flattened and have a definite anterior and posterior end. Platyhelminthes lacks a circulatory system. Characteristics of Sponges: back 40. The Platyhelminthes consist of two lineages: the Catenulida and the Rhabditophora. They are heterotrophic in nature. The Animal Kingdom is characterized by: multicellular, eukaryotic organisms that obtain their nutrients by feeding on other animals, plants or fungi. Class Trematoda comprises common flukes and the fourth class … Eggs may lodge in gastrointestinal, renal, neural, and other systems. 40. 28 Schistosomiasis. A phylum of the invertebrates, commonly called the flatworms. Has. Characteristics of Animal Kingdom: heterotrophic, multicellular organisms. Their body has a cavity or pseudocoelom. The space between body organs is therefore filled with mesenchyme. (a) Class Turbellaria includes the Bedford’s flatworm (Pseudobiceros bedfordi), which is about 8–10 cm in length. Sponges. Answer: Phylum Platyhelminthes includes triploblastic, acoelomate, bilaterally symmetrical and dorsoventrally compressed flatworms. And commonly found in freshwater habitats compressed flatworms these invertebrate animals are unsegmented worms with symmetry. 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