1. AccessScience | Acoela Phylogeny And Systematics acoelomates are triploblastic animals that lack an internal body cavity. Included in this group are the Acoela (acoel flatworms), which represent the http://www.accessscience.com/search.aspx?rootID=800253

2. Acoelomates THE TRIPLOBLASTIC, ACOELOMATE BODY PLAN Bilateria. The acoelomates, pseudocoelomates, and eucoelomates; Characteristics . bilateral symmetry; cephalization http://users.tamuk.edu/kfjab02/Biology/BIOLOGY II/Taxa/b1313_ch19.htm

THE TRIPLOBLASTIC, ACOELOMATE BODY PLAN Bilateria The acoelomates, pseudocoelomates, and eucoelomates Characteristics bilateral symmetry cephalization triploblastic acoelomates Characteristics no body cavity [fig. 16.11a]; body solid, double-walled sac surrounding digestive cavity; tissue-organ grade: organs are aggregates of specialized tissues Taxa Phylum Platyhelminthes - flatworms Phylum Nemertea - ribbon (or proboscis) worms Phylum Gastrotricha - jaw worms, marine, live between sand grains PHYLUM PLATYHELMINTHES - flatworms; 20,000 spp. characteristics dorsoventrally flattened unsegmented definite head carnivorous, freeliving and parasites Learn about flatworms from the University of California Museum of Paleontology website Learn about flatworms from the University of Michigan Museum of Zoology website Class Turbellaria planarians [fig. 19.1] Characteristics free living, mainly marine, but freshwater and terrestrial locomotion via cilia [Fig. 19.3] and muscular contractions for swimming gastrovascular cavity [Fig. 19.4] pharynx [Fig. 19.5]

3. Acoelomates Phylum Platyhelminthes And Nemertea And acoelomates Phylum Platyhelminthes and Nemertea and Pseudocoelomates Phyla Nematoda and Rotifera Parasitism 7.1 Lab 7 Biological Sciences 102 - Animal Biology This lab http://www.biosciweb.net/animal/pdf/pdf labs/102pdflabss10/7acpseduocoelwormlab7

4. The Platyhelminthes And The Acoela Illustrated article by Seth Tyler discussing the difficulty in correctly classifying the flatworms and the acoelomates. http://devbio.umesci.maine.edu/styler/globalworming/platyhelm.htm

Platyhelminthes and Acoelomorpha-phyla of controversy University of Maine Representative worms from the three major monophyletic groups of flatworms: the Acoelomorpha (represented by an acoel turbellarian), the Catenulida (represented by a retronectid turbellarian), and the Rhabditophora (represented by a digenetic trematode) The relatively small worms that are commonly called flatworms are classified in the phyla Platyhelminthes, whose Greek roots mean, in fact, "flat worm," and the Acoelomorpha, recently removed from the Platyhelminthes into its own phylum. In general, the flatworms are softbodied (lacking cuticle or other rigid skeletal support), have a solid body form (lacking the fluid-filled space, such as coelom, pseudocoel, or hemocoel, between body wall and gut that is seen in other animals), are hermaphroditic (individuals have both male and female reproductive organs and mutually inseminate in sexual reproduction), have spermatozoa with two tails (a pair of flagella arise from the paired centrioles of the developing sperm cell), have a sack-like gut (the only opening to the digestive tissue being the mouth)

5. 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/dictionary/acoelomates

6. A Is For Acoelomates A is for acoelomates The acoelomates are animals without a gut cavity. They are the primitive flat worms. This group includes the three classes of the phylum http://mythicmind.com/files/Coelo.doc

7. Animal (biology) :: Acoelomates -- Britannica Online Encyclopedia animal (biology), acoelomates, Britannica Online Encyclopedia, Flatworms (phyla Platyhelminthes, Nemertea, and Mesozoa) lack a coelom, although nemerteans have a fluidfilled http://www.britannica.com/EBchecked/topic/25501/animal/31736/Acoelomates

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. animal My Britannica CREATE MY animal NEW ARTICLE ... SAVE animal Table of Contents: animal Article Article The animal kingdom The animal kingdom - A definition of animals A definition of animals - History of classification History of classification Animal diversity Animal diversity - Parazoa: a cellular level of organiza... Parazoa: a cellular level of organization - Radiata: a tissue level of organizati... Radiata: a tissue level of organization - Bilateria: an organ level of organiza... Bilateria: an organ level of organization - - Acoelomates Acoelomates - - Pseudocoelomates, or aschelminths

8. ACŒLOMATES - Encyclopédie Universalis Is the phylum mollusca acoelomates, pseudocoelomates or coelomates? ChaCha has the answer The acoelomate phyla are Placozoa , Porifera , Cnidaria , Ctenop http://www.universalis.fr/encyclopedie/acoelomates/

Encyclopædia Universalis, le portail de la connaissance Accueil Boutique Contact Assistance J'ai oublié mon mot de passe Zone de recherche Saisir un mot clef ACOELOMATES Ce sujet est traité dans les articles suivants : CNIDAIRES Auteur :  Andrée TÉTRY Dans le chapitre " Caractères généraux  : … cavité, la cavité gastrovasculaire qui communique avec l'extérieur par un seul orifice, la bouche.* Ils ne possèdent donc pas de cavité générale, ou cœlome ; ce sont des  acœlomates.  Ils sont dépourvus d'une région céphalique ou tête bien définie, peut-être parce que le système nerveux diffus forme des réseaux et ne comporte pas de centres… Lire la suite Auteur :  Odette TUZET …  matière gélatineuse anhiste contenant des cellules émigrées provenant généralement de l'ectoderme.* Les Cœlentérés n'ayant pas de mésoderme n'ont pas de cœlome, celui-ci étant une cavité limitée par le mésoderme ; ce sont des  acœlomates . Les  Cténaires  ou  Cténophores  sont donc, comme les Cnidaires, des diploblastiques,…

9. Invert_5.html [acoelomates] Notes acoelomates and Pseudocoelomates To Pseudocoelomates. acoelomates Platyhelminthes. These are flatworms, flukes and tapeworms. They have a gastrovascular http://library.thinkquest.org/C006669/data/Biol/invert_5.html

Notes: Acoelomates and Pseudocoelomates To Pseudocoelomates Acoelomates Platyhelminthes These are flatworms, flukes and tapeworms. They have a gastrovascular cavity (no body cavity), true muscle tissue, and moderate levels of cephalization. Turbellaria. This class of acoelomates includes free-living marine organisms. The most well-known example of this class is Planaria Planaria is one of the few aquatic turbellarians. In it, nitrogeneous waste diffuses through the ectoderm. Planaria lack gas exchange and circulation specialization. It has a fine-branching gastrovascular cavity, a simple excretory system that functions only when osmotic forces are balanced and a flat shape - so all the cells are close to water. Osmoregulation is regulated by ciliated cells called flame cells that move water in and out of the flatworm. Flatworms move via cilia on the ventral side where mucus is often secreted when not "swimming" (for a planarian to swim it undulates). Eyespots detect light and lateral flaps locate pheromones. Trematoda and Monogenea.

10. Acoelomates | Define Acoelomates At Dictionary.com –adjective 1. Also, a coe lom a tous / ˌeɪ siˈlɒm ə təs , ˈloʊ mə- / Show Spelled ey-see- lom - uh -t uh s , - loh -m uh - Show IPA , a coe lo mous http://dictionary.reference.com/browse/acoelomates

11. Natural History Collections: Evolution Of The Minor Phyla acoelomates lack a body cavity. In pseudocoelomates, the coelom is formed from a persistent embryonic cavity. In schizocoelous coelomates, the coelom is formed by splits in the http://www.nhc.ed.ac.uk/index.php?page=24.25.312.328.331

12. The Acoelomates Unit 4 Acoelomate Animals Phylum Platyhelminthes, Phylum Nemertea. 1. Discuss the current triploblastic acoelomate body plan. 2. Discuss the concept of the organ/system http://www.wncc.net/courses/dnash/zoology/acoelomates.htm

Unit 4:  Acoelomate Animals:  Phylum Platyhelminthes,  Phylum Nemertea 1.  Discuss the current triploblastic acoelomate body plan. 2.  Discuss the concept of the organ/system level of organization and apply this to the phylums to be studied in this unit. 3.  Define bilateral symmetry and cephalization. 4.  Compare the enbryo development in cnidarians and in the higher metazoa, including presence, formation and function of the mesoderm. 5.  Explain what excretion consists of and tell why excretory systems are necessary in the more complex animal groups. 6.  Describe flame cells and their function in general, and the excretory system of planaria in particular. 7.  Briefly describe these advances of the flatworms over previously studied phyla:  symmetry, nervous and sensory systems, mesoderm formation, muscle systems, excretory systems, digestive systems and reproductive systems. 8.  Explain the terms hermaphroditic, monoecious and dioecious, and state what animal types in general are hermaphroditic. 9.  List features which will be expected in higher phyla but are not possessed by the flatworms, and tell why these features are unnecessary in flatworms.

13. Section 27-1 Flatworms Why are flatworms known as acoelomates? 5. Is the following sentence true or false? Flatworms are the simplest animals to have three germ layers. http://www.pearsonschool.com/live/customer_central/microsite/cafreelearning/scie

14. Flatworm - Wikipedia, The Free Encyclopedia not have than by any particular series of bodily specializations. Unlike other bilaterians, platyhelminthes have no internal body cavity and are therefore described as acoelomates. http://en.wikipedia.org/wiki/Flatworm

Flatworm From Wikipedia, the free encyclopedia Jump to: navigation search Platyhelminthes PreЄ O S D ... N Bedford's flatworm, Pseudobiceros bedfordi Scientific classification Kingdom: Animalia Subkingdom: Eumetazoa Superphylum: Platyzoa Phylum: Platyhelminthes Gegenbaur Classes Monogenea Trematoda ... Turbellaria The flatworms , known in scientific literature as Platyhelminthes or Plathelminthes (from the Greek platy , meaning "flat" and ἕλμινς (root: ἑλμινθ-), helminth- , meaning worm) are a phylum of relatively simple bilaterian unsegmented , soft-bodied invertebrate animals . Unlike other bilaterians, they have no body cavity , and no specialized circulatory and respiratory organs , which restricts them to flattened shapes that allow oxygen and nutrients to pass through their bodies by diffusion In traditional zoology texts Platyhelminthes are divided into Turbellaria , which are mostly non- parasitic animals such as planarians , and three entirely parasitic groups: Cestoda Trematoda and Monogenea . Turbellarians are mostly predators, and live in water or in shaded, humid terrestrial environments such as leaf litter . Cestodes (tapeworms) and trematodes (flukes) have complex life-cycles, with mature stages that live as parasites in the digestive systems of fish or land

15. Www.csus.edu Possible Essay Questions Bio 11 Exam 3 Avery. acoelomates. Describe two evolutionary advancements found in Phylum Platyhelminthes that were not present in Phylum Cnidaria. http://www.csus.edu/indiv/a/averyw/bio11/exam3essays.htm

Possible Essay Questions Bio 11 Exam 3 Avery Acoelomates Describe two evolutionary advancements found in Phylum Platyhelminthes that were not present in Phylum Cnidaria. Describe the process called cephalization and explain why it might give an advantage to an animal over an "uncephalized" animal. Briefly explain a representative trematode (or cestode) life cycle. Include a name and description for each stage, host, location in host and means of entry (or movement) into that location within that host. Pseudocoelomates Describe two evolutionary advancements found in Phylum Nematoda that were not present in Phylum Platyhelminthes. Define a pseudocoelom and briefly explain two possible adaptive advantages in having a pseudocoelom over the acoelomate condition. Briefly explain the Ascaris or Enterobius ) life cycle. Include a name and description for each stage, host, location in host and means of entry (or movement) into that location within that host Mollusca Describe two evolutionary advancements found in Phylum Mollusca that were not present in Phylum Platyhelminthes or Phylum Nematoda. Describe the structure and function of the molluscan mantle (or radula or foot).

16. Acoelomate - Definition Of Acoelomate By The Free Online Dictionary, Thesaurus A a coe lo mate (s l-m t) n. An animal that lacks a coelom. acoelomates, which include the flatworm, fluke, tapeworm, and ribbon worm, exhibit bilateral symmetry and possess one http://www.thefreedictionary.com/acoelomate

17. Classification Of Organisms (Bill Crowe's Notes) acoelomates PSEUDOCOELOMATES (Bill Crowe's Notes) Eumetazoa Metazoans with organs, mouth, and digestive cavity. Bilateria Bilateral animals. http://staffweb.itsligo.ie/staff/bcrowe/bill/styles/frames/taxon/kingd/ankingd/a

18. Acoelomate: Definition From Answers.com n. An animal that lacks a coelom. acoelomates, which include the flatworm, fluke, tapeworm, and ribbon worm, exhibit bilateral symmetry and possess one internal space, the http://www.answers.com/topic/acoelomate

19. Acoelomates - Definition Of Acoelomates In The Medical Dictionary - By The Free body cavity, any of the spaces in the human body that contain organs. One major cavity, the thoracic cavity, is subdivided into a pericardial and two pleural cavities. http://medical-dictionary.thefreedictionary.com/Acoelomates

20. Kingdom Animalia- ACOELOMATES Kingdom Animalia acoelomates There are two acoelomate phyla. Phylum Platyhelminthes. Phylum Nemertina A copy of these images is available for copy on reserve at Dirac http://bio.fsu.edu/~bsc2011l/schrader/acoelomates.html

Kingdom Animalia - Acoelomates There are two acoelomate phyla. Phylum Platyhelminthes Phylum Nemertina A copy of these images is available for copy on reserve at Dirac Science Library. To print your own copy, you will need to have MS PowerPoint installed on your computer. Click here to download ( Acoelomates.ppt - 7.9MB back to Kingdom Animalia back to Laboratory Review main page

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