adoral zone of membranelles
Stentor amethystinus - a smallish brown member of the genus. The brown colour comes from a combination of dark red pigment granules which lie in rows between the kineties and may also lie within the cytoplasm., and endosymbiotic green algae. There is a single macronucleus, usually also surrounded by pigment granules and with up to 10 or so micronuclei are pressed against the surface of the macronucleus. Tends to adopt a somewhat shortened shape when attached. This image is of the adoral zone of membranelles (AZM) which curves around the apex of the cell and leads towards the cytostome. For more details on this organism and a comment about the identity, see Heep, T., Rohozinski, J., Simpson, A. and Patterson, D.J. 1998. Stentor amethuystinus (Protista: Ciliophora: Heterotrichida), a common protozoan member of the fresh-water plankton in Australia. Records Australian Museum, 50: 211-216. These images were taken of protozoa among marginal debris in the slow moving freshwater stream at Audley in New South Wales Australia by Feng Wie-Song and D. J. Patterson. Image copyright: Wie-Song Feng and D. J. Patterson, image used under license to MBL (micro*scope).
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From the collection
|Description of Stentor amethystinus: Extended cells 250-500 microns long, contracted cells 135-350 microns. In the center of the body more spherical macronucleus (in vivo 20-30 microns long) with many (>20) micronuclei. Cells look brown, with red pigment granules and green symbiotic algae. Contractile vacuole at the left wall of the mouth funnel. 90-110 longitudinal ciliary rows, the gap between which becomes larger in the clockwise direction. Peristomial region with 20-25 ciliary rows. About 200-300 adoral membranelles. Parallel to the adoral membrane zone. Common. |