Lackey, James B. Department of Environmental Engineering, University of Florida, Gainesville, Florida.
- Additional Reading
An order of class Zoomastigophorea in the phylum Protozoa. These are colorless flagellate symbionts in the digestive tract of the roach Cryptocercus and of certain termites. They are xylophagous; that is, they ingest wood particles taken in by the host. Seven or more genera of medium or large size have been identified, with the organisms varying from pyriform to ovoid in shape. At the anterior end, a pliable necklike rostrum attaches the organism to the host intestinal wall, but the organisms are sometimes free (see illustration). They can be either uni- or multinucleate. These organisms are termed karyomastigonts and each gives rise to two pairs of flagella in the unattached cells, with two flagella to each blepharoplast. In the rostrum, there is an axostylar apparatus, fibrils which pass to, and emerge at the posterior part of, the body. The nuclei contain long threadlike persistent chromosomes which appear to pass at random onto an intranuclear spindle. Isogamous (union of similar gametes) sexual processes have been described for three genera. In some cases, at least, these parallel the molting of the host.
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. Contributors include more than 10,000 highly qualified scientists and 45 Nobel Prize winners.
MORE THAN 8700 articles 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 19,000 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