21. Acoelomates - Definition And More From The Free Merriam-Webster Dictionary Definition of word from the MerriamWebster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. http://www.merriam-webster.com/medical/acoelomates

22. Answers.com - Are Flatworms Acoelomates Microbiology question Are flatworms acoelomates? yes Why are flatworms called acoelomates? probably latin name or different laungage http://wiki.answers.com/Q/Are_flatworms_acoelomates

23. Acoelomates (Science/Biology/Flora_and_Fauna/Animalia/Acoelomates) The term acoelomates means without coeloms , the coelom being a body space surrounded by an extra layer of cells, the http://www.robtex.com/dmoz/Science/Biology/Flora_and_Fauna/Animalia/Acoelomates/

powered by dmoz Science Biology Animalia ... Acoelomates Share on twitter digg delicious Swiss Army Knife ... FAQ Acoelomates (Science/Biology/Flora_and_Fauna/Animalia/Acoelomates) up Acoelomates The term acoelomates means "without coeloms", the coelom being a body space surrounded by an extra layer of cells, the mesoderm. The most important acoelomates are the flat worms contained in the phylum Platyhelminthes, including the free-living Turbellaria, the Trematoda or liver flukes and the Cestoda or parasitic tapeworms. Other phyla included are Nemertina, the ribbon worms, Orthonectida, Rhombozoa and Gnathostomulida, members of which are typically worm-like creatures sometimes classed together as polychaetes, or bristly worms. Classification in this area of the animal kingdom is unclear. Entries Reefkeeper’s Guide to Invertebrate Zoology: Flat and Ribbon Worms http://www.reefs.org/library/aquarium_net/0297/0297_5.html Article outlining the biology of the Platyhelminthes and Nemertea. Related categories Gnathostomulida Members of this phylum are marine worms less than 1mm long. They have no body cavity but do have a pair of jaws which gives them their name (gnathos is Greek for jaws) and a blind gut with a mouth but (more...)

24. Answers.com - What Is Acoelomate Are acoelomates have fluid? Is rotifer an acoelomate? Is a hydra a acoelomate? Are ehinodrms acoelomates? Is a bird a acoelomates? Are frogs acoelomates? http://wiki.answers.com/Q/What_is_acoelomate

25. Introduction To Animal Evolution (a) The most primitive of eumetazoa (the radiata and the acoelomates) possess a single opening into their digestive cavity, one that serves as both a mouth and an http://www.mansfield.ohio-state.edu/~sabedon/campbl32.htm

26. Platyhelminthes (Acoelomates) Phylum Platyhelminthes. General Characteristics. 1) Triploblastic (applies all three phyla of acoelomates). 2) Bilateral symmetry (applies all three). http://www.hbwbiology.net/taxonomy-platyhelminthes.htm

Phylum Platyhelminthes General Characteristics ) Triploblastic (applies all three phyla of acoelomates). ) Bilateral symmetry (applies all three). ) Body is flattened dorsoventrally (compressed dorsoventrally). ) Ectoderm is very specialized w/ distinct epidermis in all three phyla. *Note: specialized "flatworm" characteristics associated externally w/ epidermis. a ) some spp. epidermis is syncitial ) Having one/few epidermal cells having many nucleus. Usually elaborating cilia in many spp. Aid in locomotion and protection. b ) rhabdites - specialized epidermal cells and extracellular structures of many flukes, which aid in locomotion. c ) Syncytial tegument - extraepidermal layer of one/few multinucleated cell(s) w/ protective covering. In many flukes. d ) Same cellular extraepidermal structures and epidermis. One nucleus/cell. Multicellular arrangement of epidermis and sometimes ciliated structures. ) Muscular development and arrangement into simple body wall muscles used mainly for locomotion. ) No body cavity ( acoelomate ) Digestive tract is incomplete: a ) No mouth (oral opening directly into pharynx).

27. Body Cavity - New World Encyclopedia Side view of a flatworm. The flatworm's ribbonshaped, flattened dorso-ventally body has no true body cavity (coelom) except the gut and thus flatworms are acoelomates. http://www.newworldencyclopedia.org/entry/Body_cavity

Body cavity From New World Encyclopedia Jump to: navigation search Previous (Bodhisattva) Next (Boer Wars) Side view of a flatworm. The flatworm's ribbon-shaped, flattened dorso-ventally body has no true body cavity (coelom) except the gut and thus flatworms are acoelomates. In zoology body cavity generally refers to the space, or cavity, located between an animal ’s outer covering (epidermis) and the outer lining of the gut cavity—a fluid-filled space where internal organs develop. However, the term sometimes is used synonymously with the coelom or "secondary body cavity," which is more specifically that fluid-filled body cavity between the digestive tract and the outer body wall that is completely enclosed by cells derived from mesoderm tissue in the embryo . The broadest definition of the term body cavity is any fluid-filled space in a multicellular organism, including the digestive tract. The concept of body cavity has been important in comparative studies of the body plans used by different taxonomic groups , ranging from simple organisms with two germ layers (ectoderm and endoderm) that lack a body cavity, to organisms with three germ layers (a mesoderm also) that lack a body cavity, to those with a cavity forming between the mesoderm and endoderm and not completely lined with mesoderm, to those with a true coelom completely lined with mesoderm. Contents Overview Primary and secondary body cavities, acoelomates, pseudocoelomates, and coelomates

28. Flatworm - New World Encyclopedia acoelomates are invertebrates that do not have a coelom, or body cavity. With about 25,000 known species, flatworms are the largest phylum of acoelomates. http://www.newworldencyclopedia.org/entry/Flatworm

Flatworm From New World Encyclopedia Jump to: navigation search Previous (Flannery O'Connor) Next (Flavian dynasty) Flatworms "Platodes" from Ernst Haeckel 's Kunstformen der Natur Scientific classification Kingdom: Animalia Phylum: Platyhelminthes Classes Monogenea Trematoda Cestoda Turbellaria The flatworms are a phylum, Platyhelminthes, of relatively simple, soft-bodied, bilaterially symmetrical invertebrate animals . The name of the phylum comes from the Greek platy, meaning "flat," and helminth, meaning "worm," which is indicative of their ribbon-shaped, flattened appearance. They include the flukes and tapeworms, among others. Flatworms are acoelomates that are characterized by having three germ layers (ectoderm, mesoderm, and endoderm) and lacking respiratory and circulatory systems. Acoelomates are invertebrates that do not have a coelom, or body cavity. With about 25,000 known species , flatworms are the largest phylum of acoelomates. Platyhelminths are thought to be the first invertebrates to have a third germ layer, the mesoderm (Towle 1989). Flatworms are found in marine, freshwater, and even damp terrestrial environments. They generally are placed into four classes: Trematoda (

29. General Biology/Animal Evolution - Wikibooks, Collection Of Open-content Textboo We will consider three conditions with respect to the body cavity acoelomates. These animals lack an enclosed body cavity; the only body cavity is the lumen of the digestive tube http://en.wikibooks.org/wiki/General_Biology/Animal_Evolution

General Biology/Animal Evolution From Wikibooks, the open-content textbooks collection General Biology This page may need to be reviewed for quality. Jump to: navigation search General Biology Getting Started ... Additional Material Contents The Evolutionary Tree in Animals Support for the "Tuning Fork" Model Body Symmetry Asymmetry ... edit The Evolutionary Tree in Animals There are many competing hypotheses for the form of the evolutionary tree of animals. A traditional hypothesis is that the tree resembles a tuning fork: it has a short base and two main branches. However, there is recent molecular evidence that challenges part of this traditional hypothesis. Under the tuning fork model, the "base" of the tree includes structurally simple animals like sponges, corals, and their relatives. One main branch includes arthropods molluscs annelids , and nematodes . This branch, or a large part of it, usually is called the protostomes The second main branch includes vertebrates ( phylum Chordata ), and starfish, sea urchins, and their relatives ( phylum Echinodermata ). This branch usually is called the

30. ACOELOMATES These next guys caused a laugh in the video… (Ooh, yes their going to do it………….. Yes, Yes, YES! Oh wow! That was great!) It was violent and yet the participants were quite http://bio.fsu.edu/~bsc2011l/pdfs/4-2011L_2005_Fall_Acoelomates.pdf

31. Acoelomate (biology) -- Britannica Online Encyclopedia circulatory system (in circulation (anatomy and physiology) acoelomates and pseudocoelomates) to these problems; most but not all involve the development of a circulatory http://www.britannica.com/EBchecked/topic/3909/acoelomate

document.write(''); Search Site: Advanced Search With all of these words With the exact phrase With any of these words Without these words Home SHOP BROWSE BLOG ... HELP Username: Password: Remember me Forgot your password? Help Email " is the e-mail address you used when you registered. Password " is case sensitive. If you need additional assistance, please contact customer support Enter the e-mail address you used when enrolling for Britannica Premium Service and we will e-mail your password to you. acoelomate My Britannica CREATE MY acoelomate NEW ARTICLE ... SAVE acoelomate Table of Contents: acoelomate Article Article Related Articles Related Articles Citations Article Related Articles Citations LINKS Related Articles Aspects of the topic acoelomate are discussed in the following places at Britannica. Assorted References anatomy in animal (biology): Acoelomates Flatworms (phyla Platyhelminthes, Nemertea, and Mesozoa) lack a coelom, although nemerteans have a fluid-filled cavity at their anterior, or head, end, which is used to eject the proboscis rapidly. The lack of a fluid-filled cavity adjacent to the muscles reduces the extent to which the muscles can contract and the force they exert (see below Support and movement). Because most also lack a... circulatory system in circulation (anatomy and physiology): Acoelomates and pseudocoelomates ...to these problems; most but not all involve the development of a circulatory system: as described above, sponges and cnidarians permit all cells direct access to environmental water. Among the acoelomate phyla, the members of Platyhelminthes (flatworms) have no body cavity, and the space between the gut and the body wall, when present, is filled with a spongy organ tissue of mesodermal...

32. Acoelomates Definition Of Acoelomates In The Free Online Encyclopedia. body cavity ′b d ē ‚kav əd ē (anatomy) The peritoneal, pleural, or pericardial cavities, or the cavity of the tunica vaginalis testis. http://encyclopedia2.thefreedictionary.com/Acoelomates

33. Platyhelminthes Kingdom Animalia PHYLUM PLATYHELMINTHES triploblastic acoelomates. INTRODUCTION The Platyhelminthes include free-living flatworms, like the planarians, and the parasitic http://www.esu.edu/~milewski/intro_biol_two/lab__10_platy_nemat/Platyhelminthes.

Kingdom Animalia PHYLUM PLATYHELMINTHES - triploblastic acoelomates INTRODUCTION: The Platyhelminthes include free-living flatworms, like the planarians, and the parasitic tapeworms and flukes. The term flatworm refers to the fact that the body is dorsoventrally flattened. Flatworms are the first organisms to have tissues organized into organs and the first to demonstrate bilateral symmetry. Bilateral symmetry means that one plane passing through the longitudinal axis of an organism divides it into right and left halves that are mirror images. It is characteristic of active, crawling, or swimming organisms and usually results in the formation of a distinct head ( cephalization ) where accumulation of nervous tissue and sensory structures occurs. This reflects the importance to the organism of monitoring the environment it is meeting - rather than that through which it has just passed - and results in the presence of definite anterior and posterior ends. The Platyhelminthes and all phyla above them on the evolutionary tree are bilaterally symmetrical or have evolved from bilaterally symmetrical ancestors. In the Platyhelminthes, different tissues cooperate in any given function. This results in the organ level of organization. Three major sets of organs characterize the phylum. The excretory system consists of flame cells and their associated ducts. The nervous system consists of a pair of anterior ganglia, usually with two nerve cords winning the length of the organism. Nerve cords are interconnected by transverse nerves to form a ladder-like structure. The digestive tract is incomplete (a single opening serves for ingestion of food and elimination of wastes).

34. Coeloms And Pseudocoeloms Acoelomate animals are called acoelomates and they have no true body cavity. The acoelomate phyla are Placozoa , Porifera , Cnidaria , Ctenophora , Platyhelminthes, Mesozoa http://www.earthlife.net/inverts/coelom.html

Coeloms and Pseudocoeloms Throughout these invertebrate pages you will find reference to animals as being Coelomate, Pseudocoelomate and Acoelomate. All these terms, and others explained below are to do with the nature of the body cavity of the animal. Simple animals do not have a body cavity but higher animals like mammals do. In mammals the body cavity is called a Coelom and it is the area that contains all heart and lungs as well as the gut which is a cavity in its own rite. The words used to define different body cavities relate to how the cavity comes into being during the development of the embryo as well as to its final observable structure. Below university level education it is not terribly important to understand the differences but I have put these explanations up separately from the glossary to make it easier to use. Also because of the length of this explanation I am only typing it out once here rather than each time I have used such a term. Acoelomate animals are called acoelomates and they have no true body cavity. The acoelomate phyla are Placozoa , Porifera , Cnidaria , Ctenophora , Platyhelminthes, Mesozoa, Nemertina, Gnathostomulida. Pseudocoelomate animals have a pseudocoelom. They have a body cavity but it is not lined with mesodermal cells. It exists between the mesoderm and the endoderm that makes up the walls of the gut. It does not have supportive mesodermal mesenteries. The pseudocoelomate phyla are Gastrotricha, Rotifera, Nematoda, Nematomorpha, Kinorhyncha, Loricifera, Acanthocephala.

35. Adventist Youth Honors Answer Book/Nature/Worms - Advanced - Wikibooks, Collecti Distinguish between the following body structures coelomates, pseudocoelomates, and acoelomates. All of the following body structures contain bilateral symmetry. http://en.wikibooks.org/wiki/Adventist_Youth_Honors_Answer_Book/Nature/Worms_-_A

Adventist Youth Honors Answer Book/Nature/Worms - Advanced From Wikibooks, the open-content textbooks collection Adventist Youth Honors Answer Book Nature Jump to: navigation search Worms - Advanced Nature North American Division Skill Level 2 Year of Introduction: 2006 Contents Contents 1. What are the 3 major classes of platyhelminthes and describe them. 2. Name an example of a nematoda and describe its lifecycle. 3. What are the three major classes of annelida and how do they move? 4. Answer the following: ... edit 1. What are the 3 major classes of platyhelminthes and describe them. The Monogenea, Trematoda, and Cestoda are the three major classes of parasitic flatworms, though the Turbellaria used to be considered a part of this class* Monogeneans are largely ectoparasites on vertebrates like fishes; trematodes are the flukes, most of which live inside the organs of a variety of vertebrates as adults; and cestodes are the tapeworms, living in the intestines of a variety of vertebrates as adults (this is why your pets get annual shots—so that they don’t experience cestodes or trematodes—otherwise, pets could die as a result of an infestation of these worms.) All Platyhelminthes are hermaphroditic in nature, meaning they can fertilize themselves.

36. Acoelomates Lecture Outline 2003 L. Holmstrand. Chapter 8 Acoelomate Animals Flatworms, Ribbon Worms and Jaw Worms. NEW FEATURES Triploblastic with three well-defined germ layers http://www.d.umn.edu/biology/courses/bio3701/acoelomates.htm

Lecture Outline 2003�� L. Holmstrand Chapter 8 �Acoelomate Animals�� - Flatworms, Ribbon Worms and Jaw Worms NEW �FEATURES: Triploblastic with three well-defined germ layers � but no coelom (acoelomate) Review Fig. 3.9 on p 61 for phylogenetic placement Bilateral symmetry with Cephalization Organ-System Level of Organization Centralized Nervous System Have Excretory Systems Muscle fibers from mesodermi Unique and special features in each Phylum A. Phylum Platyhelminthes � Flatworms Characteristics: Bilateral symmetry Dorsoventrally flattened Epidermis cellular or syncytial Muscular system arising from mesoderm Incomplete digestive system (gastrovascular cavity) Nervous system - Anterior ganglia and lateral nerve cords Excretory system - lateral canals with flame cells (protonephridia) Free living or parasitic Monecious or diecious, - complex reproductive cycles Respiration - diffusion 1. Class Turbellaria� free- living flatworms � freshwater, marine and terrestrial variable in size and shape Morpholgy � External surface usually ciliated Mucus glands (Adhesive and Releaser) Rhabdites - ����epidermal cells - release protective mucus sheath Epridermis cellular or synctial Dorsal Ventral Feeding and Digestion ��- �Protrusible proboscis and Gastrovascular cavity Sensory Structures - auricles and eyespots Nervous System - ladder type Excretion and Water Balance - lateral canals with flame cells; Diffusion

37. Biology: Acoelomates, Pseudocoelomates, Coelomates | MindBites.com Taught by Professor George Wolfe, this lesson was selected from a broader, comprehensive course, Biology. This course and others are available from Th http://www.mindbites.com/lesson/4263-biology-acoelomates-pseudocoelomates-coelom

utmx_section("New herobox test") utmx_section("Auto play test") MindBites how-to videos Learn with how-to videos Sell your videos online How-to video community ... Biology Videos Biology: Acoelomates, Pseudocoelomates, Coelomates Browse Categories Featured Free Recent Technology Hardware Computers Programming Flash HTML ActionScript PHP Software Microsoft Excel Adobe Illustrator Adobe Photoshop Gimp Joomla Microsoft SharePoint 3ds Max Video Production Video Editing Social Media Baby Sign Language Education Sciences Biology Chemistry Organic Chemistry Physics English Grammar Public Speaking Math Algebra Basic Math Calculus Geometry Trigonometry Social Sciences Government History Economics Self-Help Drawing Jewelry Making Painting Paper Arts Pottery Sewing Photography Dance Business Seminars Motivational Speakers Training Seminars Martial Arts Tips From MindBites Click here to read more about IE6 and why it makes sense to upgrade. Biology: Acoelomates, Pseudocoelomates, Coelomates by Thinkwell Preview Like what you see?

38. General Features 10/6/08 2  acoelomates  Typical acoelomates have only one internal space, the digestive cavity  Region between the epidermis and digestive cavity is filled with http://www.mccd.edu/faculty/estrellac/zoology/LectureOutlines/chapt14_Acoelomate

39. Ch. 10 Ch. 10 acoelomates - Miller and Harley _ I. Evolutionary perspective http://www.ltcconline.net/kloss/bio212/ch__10.htm

Ch. 10 - Acoelomates - Miller and Harley I. Evolutionary perspective A. Phyla Platyhelminthes, Gastrotricha and Nemertea were the first to exhibit bilateral symmetry and more complex body organizations than Cnidarians. B. All these are triploblastic acoelomates C. Platyhelminthes - 1. flatworms 2. tapeworms 3. flukes D. Nemertea - small group of elongate, unsegmented soft bodied worms, mostly marine and freeliving E. Phylum Gastrotricha includes members that inhabit space between bottom sediments II. Phylum Platyhelminthes A. Characteristics: 2. Range in size from 1 mm to 25 m. 3. ectoderm becomes epidermis, endoderm becomes gv cavity 4. mesodermal tissues include parenchyma - filler tissue a. skeletal support b. nutrient storage c. motility d. reserves of regenerative cells e. transport of materials f. O2 storage, etc 5. First phylum we�ve looked at w/ organ level system of organization 6. Characteristics of Phylum Platyhelminthes a. usually flattened dorsoventrally , triploblastic, acoelomate, bilateral symmetry b. unsegmented

40. Flatworm The flatworms are a phylum of relatively simple softbodied invertebrate animals. With about 25,000 known species they are the largest phylum of acoelomates. Flatworms are http://www.sciencedaily.com/articles/f/flatworm.htm

Science Reference Share Blog Print Email Bookmark Flatworm The flatworms are a phylum of relatively simple soft-bodied invertebrate animals. See also: Life Sciences Wild Animals With about 25,000 known species they are the largest phylum of acoelomates. Flatworms are found in marine, freshwater, and even damp terrestrial environments. Most are free-living forms, but many are parasitic on other animals. There are four classes: Trematoda (Flukes), Cestoda (Tapeworms), Monogenea, and Turbellaria. For more information about the topic Flatworm , read the full article at Wikipedia.org , or see the following related articles: Tapeworm read more Animal read more ... read more Note: This page refers to an article that is licensed under the GNU Free Documentation License . It uses material from the article Flatworm at Wikipedia.org. See the page for more details. Editor's Note : This article is not intended to provide medical advice, diagnosis or treatment. Related Stories Flatworms Are Oldest Living Ancestors To Those Of Us With Right And Left Sides, Researchers Report In Science (March 22, 1999) read more New Areas Of High Biological Diversity Discovered (May 21, 1999)

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