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The Journal of Foraminiferal Research; October 2002; v. 32; no. 4; p. 440-447; DOI: 10.2113/0320440
© 2002 Cushman Foundation for Foraminiferal Research
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Article

RETICULOPODIA: STRUCTURAL AND BEHAVIORAL BASIS FOR THE SUPRAGENERIC PLACEMENT OF GRANULORETICULOSAN PROTISTS

Samuel S. Bowser1,2 and Jeffrey L. Travis3

1 Wadsworth Center, New York State Department of Health, P.O. Box 509, Albany, New York 12201.
2 School of Public Health, The University at Albany, State University of New York, Albany, New York 12222.
3 Department of Biological Sciences, The University at Albany, State University of New York, Albany, New York 12222.

A complex array of branching and anastomosing granular pseudopodia (reticulopodia) is thought to be a primary feature of the protistan phylum Granuloreticulosa. This essay summarizes the results of detailed structural and behavioral analyses of reticulopodia from representative species of "naked," "soft-shelled," and unilocular agglutinated Foraminifera. Promiscuous plasma membrane fusion, experimentally demonstrated here for the first time, together with the presence of tubulin polymorphs and a unique class of ellipsoid vesicles, form a suite of phenotypic characters that further define the suprageneric status of these protists. A theoretical framework for exploring the evolution of reticulopodia is also presented.




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[Abstract] [Full Text] [PDF]


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