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Acoelomates:     more detail

Kingdom Animalia: Acoelomates and Pseudocoelomates: Separate from Laboratory Outlines in Biology VI by Peter Abramoff, Robert G. Thomson, 1995-01-01 Reproduction of Marine Invertebrates: Acoelomate and Pseudocoelomate Metazoans v. 1 The Invertebrates: Volume II, Platyhelminthes and Rhynchocoela. The Acoelomate Bilateria by L. H. Hyman, 1951-01-01

lists with details

41. The WhatUseek Directory - Acoelomates
    whatUseek offers a suite of online products and services including a web search utility, a web directory, siteLevel, changeAlarm, and more.  
    http://dir.whatuseek.com/Science/Biology/Zoology/Acoelomates

42. Chapter 25--Acoelomates And Pseudocoelomates
    Outline Ch. 25The Animals/Introducing the Invertebrates. I. What are animals? A. Eukaryotes B. multicellular, with specialized tissues C. heterotrophic  
    http://www.asms.net/facultymanaged/bmcph/courses/apbio/apbiofiles/apnotes/ch25in

43. Body Cavity - Wikipedia, The Free Encyclopedia
    By the broadest definition, a body cavity is any fluid filled space in a multicellular organism. However, the term usually refers to the space, located between an animal ’s outer  
    http://en.wikipedia.org/wiki/Body_cavity
    
    Extractions: From Wikipedia, the free encyclopedia Jump to: navigation search Picture of Human body cavities — dorsal body cavity to the left and ventral body cavity to the right. By the broadest definition, a body cavity is any fluid filled space in a multicellular organism . However, the term usually refers to the space, located between an animal ’s outer covering ( epidermis ) and the outer lining of the gut cavity, where internal organs develop. "The body cavity" of the human body cavities normally refers to the ventral body cavity , because it is by far the largest one in volume. The type of body cavity places an organism into one of three groups: Coelomates (also known as eucoelomates — "true coelom") have a fluid filled body cavity called a coelom (pronounced /ˈsiːləm/ ) with a complete lining called peritoneum derived from mesoderm (one of the three primary tissue layers ). The complete mesoderm lining allows organs to be attached to each other so that they can be suspended in a particular order while still being able to move freely within the cavity. Most bilateral animals, including all the vertebrates , are coelomates.

44. Reefs.org: Where Reefkeeping Begins On The Internet - Aquarium.Net Jan 97
    Article outlining the biology of the Platyhelminthes and Nemertea.  
    http://www.reefs.org/library/aquarium_net/0297/0297_5.html
    
    Extractions: Cnidarians (corals) Fish Invertebrates Sandbeds ... General Information This month Rob continues his series on invertebrate zoology with Ribbon worms (Platyhelminthes and Nemertea)Aquarium Net has numerous articles written by the leading authors for the advanced aquarist By Rob Toonen In the last article I tried to give a quick overview of some of the interesting and I think largely unknown details of Cnidarian biology. Notoplana sp. A flatworm about 3 cm long. There are eyespots visible near the anterior end. Photo by Ron Shimek This overview was far from comprehensive, but I tried to touch on some of the interesting research I have come across recently that I thought would be of general interest to hobbyists. Even though the article was longer than I intended, I still covered so little of the available information on cnidarians.

45. Coelomate Protostomes- Phylum Annelida
    Phylum Annelida  
    http://bio.rutgers.edu/~gb102/lab_2/306am-annelid.html

46. Www.gwu.edu
    Evolution of Coelomate Animals In the cnidarians, the space between the ectoderm and endoderm tissue layers is filled with an acellular mesoglea.  
    http://www.gwu.edu/~darwin/BiSc151/Coelom/Coelom.html
    
    Extractions: The advantage of the flatworm body plan, is the superior pull muscles can make using solid mesoderm as a lever, versus gel-like mesoglea. Problems: 1. Body organs cannot move freely but are embedded in solid mesoderm tissue. 2. It is more difficult for materials to move from the gut to the body wall. A solution to both problems is to have some sort of body cavity, called a coelom , in which the body organs lie bathed in body fluid. Movement of the body wall would not squeeze the organs, organs could grow without being pressed by the body wall, and diffusion of nutrients and wastes would be easier.

47. Department Of Wildlife And Fisheries Sciences
    Department of Wildlife and Fisheries Sciences,  
    http://www.sdstate.edu/wfs/

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