Rieger, Reinhard Institute of Zoology and Limnology, University of Innsbruck, Innsbruck, Austria.
- Additional Readings
More than 300 species of small (mostly 1 mm size) flatworms usually with a ventral mouth situated about one quarter distant from the rostral tip of the body. A ciliated tubular foregut leads into a ciliated gut. Except for the Haplopharyngida, an anus is lacking. A hindgut is never differentiated. Macrostomorpha are covered by a single-layered, ciliated epidermis; they move by ciliary gliding and have special duo-gland adhesive papillae, at least in the tail region, which they use for temporary adhesion to and quick release from the substrate (only the marine, pelagic microstomid Alaurina does not possess papillae). The space between epidermis and gut is filled with parenchymal cells and muscle cells among others. The animals are hermaphroditic; sexual reproduction is typical. Larval stages are not known. Many species are found in marine sand and mud, and in various freshwater habitats. These flatworms were formerly members of the Turbellaria-Rhabdocoela, but are now included in the Rhabditophora, which is one of three monophyletic taxa constituting the Platyhelminthes (Acoelomorpha, Catenulida, and Rhabditophora). See also: Platyhelminthes
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Its dedicated editorial team is led by Sagan Award winner John Rennie. Contributors include more than 9000 highly qualified scientists and 42 Nobel Prize winners.
MORE THAN 8500 articles and Research Reviews covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 17,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information