Adult males are 7 - 20 mm long; females a bit longer. Protozoa are notable for their ability to move independently, a characteristic found in the majority of species. Adult Worms (Sexual Reproduction) 2. and of all cestodes, trematodes and acanthocephalans – involve a definitive host, and often the environment, but also require one or more (sequential) intermediate hosts in which immature parasites undergo essential development and may reproduce asexually, but not sexually. Helminths share numerous characteristics that contribute to their parasitic quality including the presence of attachment organs. Terms in this set (...) General characteristics of flukes. Nearly all are parasites of mollusks and vertebrates. Some common nematodes include roundworms, Ascaris, hookworms and Trichinella. Reproductive organs (testes, ovary, vitellaria) Digenean Trematodes Complex Life Cycle 1. General Characteristics of Protozoa Although they are often studied in zoology courses, they are considered part of the microbial world because they are unicellular and microscopic. Trematode.doc 6 of 10 NEMATODES: A LABORATORYPERSPECTIVE 2. Morphological characteristics; 1?Adult worms. Nematodes are some of the most abundant invertebrates on earth. There are a number of characteristics shared by members of this large phylum. Incomplete gut 4. Structure of adult fluke. Definitive Host a. The female is long and slender, the male is shorter, cylindrical and characteristically in-curved to form a gynecophoral groove in which the female reposes. The organisms that will be described are: TREMATODES Prepared by FZHapan 2. Protozoa and Trematodes This chapter summarises the evidence for protozoan illnesses acquired through ingestion or inhalation of water or contact with water during water-based recreation. Suckers and/or holdfast organs 3. Most are hermaphrodite. According to research studies, nematodes rival Arthropoda both in biodiversity and the abundance of species. General Characteristic Features of Phylum Nematoda 3. Visceral, blood. General Introduction. Intermediate hosts important in veterinary helminthology include flattened, bilaterally symmetric, leaf- shaped or tongue-like ; about 0.3-80.0mm in length ; two suckers, an oral and a ventral sucker ; Most of trematodes are hermaphroditic, except schistosomes ; incomplete digestive tract, the caeca end ; blindly, without anus ; Without body cavity (acoelomate) 6 Many are free-living (such as those that live in the soil), while others are parasitic and must attach themselves to a plant, insect, animal or human host to survive and reproduce. Both males and females exist in this group of flukes. 2. CHARACTERISTICS Dorso-ventrally flattened Unsegmented Leaf-like Hermaphroditic except blood flukes Two radially striated suckers Incomplete digestive tract Adults are covered with spines, except Incomplete digestive tract Most of the body is occupied by reproductive organs Prepared by FZHapan Definition of Phylum Nematoda: Phylum Nematoda are un-segmented vermiform animals with ante­rior lateral chemosensory organs or amphids and with a persistent blastocoel or pseudocoelom; dorsal and ventral nerve cords in epidermis and excretory system of renette cells or tubules. General Characteristics of Nematodes. The parasitic intestinal helminths can be divided into three groups which include Nematodes (roundworms), Cestodes (tapeworms), and Trematodes (flukes). Nematodes 1. Environment a. Ovum (Distribution) b. Miracidium (Distribution) 3. 2 suckers: one at mouth and one on body- used for movement and host attachment. Information on schistosomiasis a disease caused by a parasitic flat worm (trematode) is also presented. Molluscan 1st Intermediate Host GENERAL CHARACTERISTICS OF NEMATODES They assume three basic morphologic forms: Egg, Larvae and Adult worms Reproduce sexually with male and female worms Complete digestive tract and complete reproductive systems 3. General characteristics a. General Flatworm Characteristics 2. Tegument: a syncytium- multiple nuclei, no … Phylum Platyhelminthes: General Characteristics and Classification June 9, 2017 Gaurab Karki Class 11 , Zoology 0 General characteristics of phylum Platyhelminthes Classification.

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