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| Characteristics (Site not responding. Last check: 2007-10-25) |
 | | An outer layer of somatic cells surrounds an inner one of reproductive cell(s) (Br 173). |
 | | Orthonectida: parasites of various animals, Turbellaria, Nemertea, Gastropoda, Bivalvia, Polychaeta, Echinodermata, Ascidiacea, etc. Unlike Dicyemida, they have contractile cells (ME 51). |
 | | About 20 species known, but due to their widespread and sporadic occurrence in all kinds of invertebrates, there is no way to estimate the total number of species (ME 52). |
| nausicaa.phys.chuo-u.ac.jp /MDS/anima97/node64.html (146 words) |
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