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Analysis of Endocytosis and Food Plaquette Formation in the Ciliated Protozoan Hyalophysa.

Published online by Cambridge University Press:  02 July 2020

Stephen C. Landers  and
Rex A. Treadaway
Stephen C. Landers
Affiliation:
Department of Biological Sciences, Troy State University, Troy, AL36082
Rex A. Treadaway
Affiliation:
Department of Biological Sciences, Troy State University, Troy, AL36082
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Extract

The ciliated protozoan Hyalophysa is a symbiont of a variety of crustaceans, including grass shrimp, hermit crabs, and blue crabs. At the molting of the host, the attached protozoans excyst and swim into the exoskeleton to feed by pinocytosis on exuvial fluid. The feeding trophonts expand to many times their original size, transforming into cells that are little more than large food vacuoles with a rim of cytoplasm stretched around the perimeter. After feeding for the only time during their life cycle, they settle on the substrate to encyst and divide into daughter tomites, and in doing so they divide the food vacuole. The tomites then leave the cyst and attach to a crustacean for their next opportunity to feed at molting.

We have followed endocytosis in Hyalophysa using two dyes, nigrosin and congo red, in order to understand the digestive process.

Type
Biological Ultrastructure/Microbiology
Information
Microscopy and Microanalysis , Volume 4 , Issue S2: Proceedings: Microscopy & Microanalysis '98, Microscopy Society of America 56th Annual Meeting, Microbeam Analysis Society 32nd Annual Meeting, Atlanta, Georgia July 12-16, 1998 , July 1998 , pp. 1152 - 1153
Copyright
Copyright © Microscopy Society of America

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