Transmission electron micrograph through the wall of the cyst of Actinophrys. The outermost layer is a loose mucoid material that attached to the substrate and engages debris. Below this is a layer of siliceous scales. This is followed by four discrete organic layers, the innermost of which is arranged helicoidally. This was added to the site by D. J. Patterson. Image copyright: D. J. Patterson, image used under license to MBL (micro*scope).
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From the collection
|Description of Actinophrys sol: Actinophrys is a spherically symmetrical heliozoon, body 15 - 60 microns, with a large central nucleus with peripheral nucleolar material. Often with about 40-50 arms, the arms taper from base to tip. A layer of peripheral vacuoles may be present especially after feeding. The axonemes terminate on the nucleus. Several species are known, mostly occuring in freshwater. The type-species A. sol is the most widely reported freshwater heliozoon. |