Home > Metazoa > Annelida > Orthonectida > Heteronectidea > Pelmatosphaeridae
Pelmatosphaera polycirri


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Distribution
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Biology
Parasitizes in the coelom of the annelid Polycirrus haematodes. Forms round spheres that are surrounded by a solid membrane. Inside the spheres develop numerous multicellular stages (termed "cleavage stages") that mature into minute elongated and multiciliated stages. These larva-like stages comprise a central inner ("axial") row of cells surrounded by a layer of homogeneously ciliated epithelium. Between the outer epithelium and the inner axial cells there are 4 longitudinal strands that have been interpreted as muscle fibres. No gametes have been described, and therefore all hitherto known stages are believed to be immature stages. The mature stage is, thus, unknown.


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This page has been updated on December 22, 2013
This site is online since May 31, 2005
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