INVERTEBRATE ZOOLOGY IN THREE BOOKS - BOOK 1 - G.I. Shcherbak - 1995

SUBKINGDOM PROTOZOA (PROTISTA)

PHYLUM MICROSPORA

Microsporidians are minute (a few micrometers) intracellular parasites of various animals, ranging from Protozoans to vertebrates, including humans. The highest number of species is known in Arthropods. Several species parasitize other parasitic organisms (a phenomenon known as hyperparasitism), such as gregarines, trematodes, and parasitic nematodes.

A characteristic feature of the members of this phylum is the formation, at the end of their life cycle, of single-celled spores enclosed in a single envelope, containing a uninucleate or binucleate germ and an extrusion apparatus (for penetrating the host Cell, from the Latin extrudo meaning to thrust out), an essential component of which is the polar tube. At all Selection/3.html">Stages of development, microsporidians lack their own Mitochondria and Lysosomes. The phylum includes a single Class, Microsporea.



Last update: 13/08/2026

Editorial and Educational Adaptation: This material has been compiled based on the primary/original source text. The project team performed an editorial review, corrected technical inaccuracies, structured sections, and adapted the content for an educational format.

What was processed:

  • elimination of formatting defects (OCR errors, structural breaks, corrupted characters);
  • editorial organization of content;
  • standardization of terminology in accordance with academic sources;
  • verification of factual statements against the original source text.

All mentions of the author, publication year, and origin of the primary text have been preserved in accordance with the source.