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Arts Business Computers Games ... ABOUT Options: Directory Entire Web Top Science Biology Animalia ... Acoelomates Acoelomates Gnathostomulida Nemertea Platyhelminthes Rhombozoa ... Reefkeeper’s Guide to Invertebrate Zoology: Flat and Ribbon Worms - Article outlining the biology of the Platyhelminthes and Nemertea. http://www.reefs.org/library/aquarium_net/0297/0297_5.html Platyhelminthes and Nemertea - Details of the classes and subclasses contained in these two phyla, with photographs of certain example species. http://www.emporia.edu/biosci/invert/lab3/ Last Updated: 2007-09-08 05:44:04 NoMoz.org About NoMoz Terms of Service Listing Rules ... Site Map

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28. Acoelomates acoelomates. Animals that do not have a coelom or body cavity; eg, sponges and flatworms. http://www.cartage.org.lb/en/themes/sciences/BotanicalSciences/AboutBotany/Gloss

Acoelomates Animals that do not have a coelom or body cavity; e.g., sponges and flatworms.

29. Acoelomates Chapter 8 Acoelomate Animals Flatworms. NEW FEATURES. Triploblastic with three welldefined germ layers – but no coelom (acoelomate) http://www.d.umn.edu/biology/courses/bio3701/acoelomates1.htm

Chapter 8 Acoelomate Animals: Flatworms NEW FEATURES Triploblastic with three well-defined germ layers – but no coelom (acoelomate) Bilateral symmetry with Cephalization Organ-System Level of Organization Centralized Nervous System Excretory Systems Muscle fibers from mesoderm 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 by diffusion 1. Class Turbellaria free - living flatworms – freshwater, marine and terrestrial Highly variable in size and shape; most are aquatic and marine Morpholgy Feeding and Digestion Sensory Structures Nervous System Excretion and Water Balance Significance of ability to osmoregulate?

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31. Acoelomate Introduction Although there are three phyla termed acoelomates because they lack a space (body cavity) between the endoderm and ectoderm, only one will be included in http://bioweb.uwlax.edu/zoolab/Table_of_Contents/Lab-4a/A/a.htm

Introduction to the acoelomates From this point on, all animals shown on the website have primary bilateral symmetry. For sessile or slow-moving forms, radial symmetry works fine but for animals that are active in seeking food, shelter, mates, etc. a new body plan is required. Bilateral symmetry (a sagittal plane passing thorough the body divides it into mirror images) coupled with cephalization (concentration of sense organs in the head region) solve these problems. The anterior (front) end moves forward and the posterior (tail) follows. The dorsal (top) side is kept facing up and the ventral (bottom) side is kept down and usually specialized for locomotion. Although there are three phyla termed acoelomates because they lack a space (body cavity) between the endoderm and ectoderm, only one will be included in the Zoo Lab website, the Phylum Platyhelminthes, which includes over 20,000 free-living and parasitic species of animals called flatworms. Note: the term "worm" has been loosely applied to a number of elongate, bilateral invertebrate animals without appendages; it is not a taxonomic term! This site was last modified July 22, 2002.

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34. Acoelomates - Wisebridge Interdisciplinary MCAT Supplement A page within the free MCAT Learning Program produced by Wisebridge Learning Systems. The topic under discussion here is acoelomates Wisebridge http://www.wisebridgelearning.com/interdisciplinary_course.php?code=040506030000

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Keywords: Both Web Directory News Top Science ... Animalia Acoelomates All Related Categories: Gnathostomulida Nemertea Platyhelminthes Rhombozoa See Also: Science: Biology: Microbiology: Parasites Web Pages: Acoelomates An introduction to the Platyhelminthes and Nemertea, with links to several images. http://users.tamuk.edu/kfjab02/Biology/Introzoology/b1313_ch19.htm Keywords: Both Web Directory News Help build the largest human-edited directory on the web. Submit a Site Open Directory Project Become an Editor

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