Phylum platyhelminthes phylum nematoda phylum annelida phylum mollusca phylum arthropoda phylum echinodermata phylum chordata conclusion phylum platyhelminthes characteristics. Mastigophora definition, classification and characteristics. It is a phylum of triploblastic, haemocoelomic, segmented invertebrates having head, thorax and abdomen, a chitinous exoskeleton and jointed legs and appendages. Body dorsoventrally flattened and bilaterally symmetrical. Scientifically speaking, they all come under the animal kingdom under phylum arthropoda the success of the arthropods can mainly be attributed to the presence of exoskeleton, which. A few of these live as parasites on humans and other animals. The word arthropoda comes from two greek words arthron and podos, where arthron means joint, and podos means foot, which together mean jointed feet. Arthropods include the insects, arachnids, crustaceans, and others. Some prominent ones include insects, spiders, ants, bees, crabs, shrimps, millipedes, centipedes etc. Flatworms definition, examples, classification and. Phylum platyhelminthes turbellaria planaria general. Most of the flatworms are classified in the superphylum lophotrochozoa, which also includes the mollusks and annelids. Phylum platyhelminthes characteristics flashcards quizlet.
The phylum name platyhelminthes literally means flatworms. It is because of this parasitic nature that they do cause some amount of trouble for the host animal. Phylum annelida is divided into four main classes, primarly on the basis of setae, parapodia, metameres and other morphological features. Jun 10, 2017 phylum annelida is divided into four main classes, primarly on the basis of setae, parapodia, metameres and other morphological features. Phylum cnidaria or coelenterate includes diverse animals like jelly fish, sea anemones, corals and the more familiar hydra. Animalia phylum platyhelminthes general characteristic structure of planaria describe the picture turbellaria planaria. Some of the general characters of phylum aschelminthes or nemathelminthes are as follows. Members of this phylum range in size from a singlecelled organism to around 23 feet long. Over twothirds of all named species on earth are arthropods figure 4. Most platyhelminthes are parasites on other animals, only the turbellarians are mostly nonparasitic. Phylum platyhelminthes acoelomate animals the diversity. The remaining platyhelminthes form a monophyletic group, one that contains all and only descendants of a common ancestor that is itself a member of the group. These are mostly endoparasites found in animals including human beings.
Study 42 terms phylum platyhelminthes flashcards quizlet. In this article we will discuss about the general characters and classification of phylum aschelminthes. Platyhelminthes biology encyclopedia body, human, animal. In this article we will discuss about the general characters and classification of phylum platyhelminthes. The simplest animals to have 3 germ layers, bilateral symmetry, and cephalization. Nov 25, 2015 general characteristics of phylum nemathelminthes nemathelminthes or aschelminthes nematos thread askos bladder, helminthes worm they are commonly called thread worm or round worm. Phylum platyhelminthes characteristics, classification and examples. Currently, about 100 species of the group have been identified. The word platyhelminthes is derived from the greek word, platy meaning flat and helminth meaning worm. In body form they are small and have a mouth but no gastrovascular cavity or excretory system. Unlike other bilaterians, they are acoelomates having no body cavity, and have no specialized circulatory and.
Cephalization head concentration of nervous tissue aceolomate no coelom body cavity tripoblastic 3 cell layers. The branch of biology study of helminthes is known as helminthology. Porifera authors touiek samaai 1, robyn payne2, seshnee maduray, and liesl janson citation samaai t, payne rp, maduray s and janson l. In the evolutionary process, the evolving of mesoderm, a third layer between ectoderm and endoderm has further resulted in struc. This group includes free living or parasitic forms. Planarians, tapeworms, flukes some are free living and some are parasitic. The following classification done by hymen based on platyhelminthes characteristics.
The conventional scheme followed by hyman 1940, hickman 1961 and storer 1965, etc. They are triploblastic, acoelomate, and bilaterally symmetrical. Minot 1876 separated nemertines from flatworms and group them as phylum. Dec 01, 2015 general characteristics and classification of arthropoda arthropoda arthon jointed. Flatworms are bilaterally symmetrical, triploblastic and acoelomate animals with organ. Atkinson lj and sink kj eds field guide to the ofshore marine invertebrates of south africa.
Soft, flattened worms with tissues and internal organ systems. The simplest animals that are bilaterally symmetrical and triploblastic composed of three fundamental cell layers are the platyhelminthes, the flatworms. They are found in places like marine water, freshwater, and damp soil. Platyhelminthes very commonly known as flatworms or tapeworms, these animals are softbodied invertebrate animals. Bilateral symmetry, a defined head and tail region and cephalization a concentration of nerve tissue in. The cnidarians are characterized by the presence of cnidocytes, polyp and medusa forms. Flatworms kingdom animalia phylum platyhelminthes ex. The representatives of the phylum platyhelminthes are commonly known as the flatworms or tapeworms. In general, tapeworm infections are not as medically serious as trematode. They are simple softbodied, bilaterian, unsegmented invertebrate animals. Platyhilmenthes are the flatworms, and are triploblastic acoelomates, which display bilateral symmetry. Start studying phylum platyhelminthes characteristics. The redefined platyhelminthes is part of the lophotrochozoa, one of the three main groups of more complex bilaterians. Learn vocabulary, terms, and more with flashcards, games, and other study tools.
There are 3 classes of flatworms, the planarians, flukes and tapeworms. The classical characteristics defining the phylum platyhelminthes are. It is a phylum of unsegmented, triploblastic, pseudocoelomic, cylindrical or threadlike worms which are covered by a body wall having cuticle and epidermis. Mostly free living forms found in fresh or sea waters or on land. Phylum platyhelminthes belongs to kingdom animalia. Introduction to the platyhelminthes life in two dimensions. Platyhelminthes flatworms 1 phylum platyhelminthes flatworms greek platy flat helminth worm. The phylum platyhelminthes makes up the 4th largest phylum among the animal kingdom. It displays the long series of proglottid subunits characteristic of the species. General characteristics and classification of arthropoda. Oct 09, 2015 biology animalia part platyhelminthes. Flatworms have no body cavity other than the gut and the smallest freeliving forms may even lack that. The phylum platyhelminthes comprises dorsoventrally flattened worms commonly known as flatworms from the greek platys, meaning flat, and helminthos, meaning worm for a general overview of this. Characteristics 3 cell layers ectoderm, mesoderm, and endoderm this becomes an organ level of development eg reproductive, muscular, and excretory organs.
Arthropods are jointlegged animals and you must have come across a few of these animals. General characteristics and classification of arthropoda arthropoda arthon jointed. The phylum platyhelminthes includes about,000 species. Gagenbaur 1859 coined the word platyhelminthes for the flat worms which are considered as the most primitive of all helminthes. Platyhelminthes have the following important characteristics. Many roundworms live as parasites in plants and animals. In fact, molecular evidence suggests that acoels should not be placed in phylum platyhelminthes and that they represent the earliest divergent bilateria. General characteristics of phylum nemathelminthes nemathelminthes or aschelminthes nematos thread askos bladder, helminthes worm they are commonly called thread worm or round worm. 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. Phylum platyhelminthes characteristics, classification. Some defining characteristics of the phylum are that flatworms are acoelomate.
Helpful for class ix, x, xi and xii cbse and all state boards, neet preparation, csir net life sciences. Catenulida is an order of the phylum platyhelminthes consisting of turbellarian worms. These are acoelomates and they include many freeliving and parasitic life forms. Classification of phylum protozoa phylum protozoa is a large and varied group and possess a complication in its classification. The platyhelminthes are a successful phylum with around 25,000 known species divided into four classes.
Dactylogyrus, commonly called a gill fluke, is about 0. Members of this phylum are soft, thinbodied, leaf or ribbonlike worms, including the familiar planaria of ponds and streams, as well as the flukes and tapeworms parasitic in human and other animal bodies. A few species belonging to this phylum can be a major cause of. Platyhelminthes flat worms the majority are parasitic on two hosts and the few are free living, it has a head and it is flatened, so, they are called flat worms, it is composed of three layers triploblastic and is bilaterally symmetrical, the majority are hermaphrodites, from examples of flat worms. Some defining characteristics of the phylum are that flatworms are acoelomate they.
Freeliving flatworms, parasitic flatworms, and parasitic flukes. Phylum platyhelminthes the flatworms include more than,000 species of freeliving and parasitic species. Phylum platyhelminthes is divided into three classes. In this article we will discuss about the phylum platyhelminthes. Phylum platyhelminthes and examples, habit or habitat. Phylum platyhelminthes is divided into four classes. The flatworms, flat worms, platyhelminthes, plathelminthes, or platyhelminths from the greek, platy, meaning flat and root. They are still very primitive, still not displaying a complete. They are bilaterally symmetrical, triploblastic, segmented and coelomate animals. Jun 09, 2017 phylum platyhelminthes is divided into three classes on the basis of body shape, mouth position and habitat.
Chapter 10 phylum platyhelminthes 183 ecology and general biology, fourth edition, 2015, 181203 the body shape is variable, spindlelike, vermiform or leaf shaped covered with the characteristic multiciliated epi thelium. General characteristics of kingdom animalia phylum. Platyhelminthes is a very interesting phylum that contains nearly 20,000 species. Scientifically speaking, they all come under the animal kingdom under phylum arthropoda. Phylum platyhelminthes is composed of the flatworms. This means that they can only be cut them lengthwise to produce two mirrorimage halves. A few species are commensalists living in harmony, or mutual benefit with another, normally larger organism.
Phylum platyhelminthes comprises 34,000 known species which are categorized under four classes. They are diploblastic eumetazoans with tissue grade of organization. These organisms are generally hermaphrodites, meaning they can have. Protozoa definition, characteristics, classification.
1072 1231 105 1252 80 603 425 775 1293 336 508 1517 415 1095 34 215 124 922 1137 926 431 1113 370 1158 915 373 962 604 1386 905 853 1469 379 1009 384 518 166 725 499 1216 1136 733 137 1127 1348 1283