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This is the top (spiral) surface of an A. parkinsoniana schizont. Image courtesy of Pamela Stephens, Midwestern State University.
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A cross section of most of the test, seen from the ventral side. This fossil foram was found in Lower Cuisian (Eocene) strata. Image courtesy of Carles Ferrandez-Canadell, University of Barcelona. This image first appeared in J. Foram. Res. 28: 135-140 and is used with permission.
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The umbilical surface of an A. parkinsoniana schizont. The "umbilical plug" which is found in many species in the genus Ammonia is prominent here. Image courtesy of Pamela Stephens, Midwestern State University.
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This tiny foram, only about 50 microns across, was collected of the Mediterranean coast of France. Image courtesy of Jan Pawlowski, University of Geneva. This image first appeared in J. Foram. Res 23:231-237, and is used with permission.
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Reophax species have a relatively simple, linear chamber arrangement. This specimen was harvested in Nueces Bay, South Texas. Image courtesy of Pamela Stephens, Midwestern State University.
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This sample was collected off the Mediterranean coast of France. Image courtesy of Jan Pawlowski, University of Geneva. This image first appeared in J. Foram. Res 23:231-237, and is used with permission.
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The large hole midway up the test is not formed by the foraminiferan; it is a break in the fragile test wall. Collected at Laguna Madre, Texas. Image courtesy of Pamela Stephens, Midwestern State University.
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This specimen was collected off Capo Colonna, in Southern Italy. The morphology of the umbilical face is somewhat different from ones collected at the Iles de Hyeres, of the French Mediterranean coast. Image courtesy of Jan Pawlowski, University of Geneva. This image first appeared in J. Foram. Res 23:231-237, and is used with permission.
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Individual collected in Saanich Inlet, Vancouver Island, British Columbia. Image courtesy of R. Timothy Patterson, Carleton University. This image first appeared in J. Foram. Res. 28:201-219 and is used with permission.
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Collected off the Ile de Porquerroles, France. Image courtesy of Jan Pawlowski, University of Geneva. This image first appeared in J. Foram. Res 23:231-237, and is used with permission.
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Collected along the South Texas coast. Image courtesy of Pamela Stephens, Midwestern State University.
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Collected off the Ile de Porquerroles, France. The test is about 40 microns across. Image courtesy of Jan Pawlowski, University of Geneva. This image first appeared in J. Foram. Res 23:231-237, and is used with permission.
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An umbilical (bottom) view of the test. Ammonia species are very tolerant of salinity changes and are common in estuarine environments. Sample collected at Hamble Estuary, Hampshire, England. Image courtesy of Elisabeth Alve, University of Oslo. Originally published in the Journal of Foraminiferal Research 31:1; used with permission.
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Collected off Capo Colonna, Italy. Image courtesy of Jan Pawlowski, University of Geneva. This image first appeared in J. Foram. Res 23:231-237, and is used with permission.
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This juvenile has only a few chambers, and is only beginning to show the distinctive coiled pattern of the adult. The genus is named after Ammon, the ram-headed Egyptian god. Sample collected at Hamble Estuary, Hampshire, England. Image courtesy of Elisabeth Alve, University of Oslo. Originally published in the Journal of Foraminiferal Research 31:1; used with permission.
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Part of the outer surface of the test is broken, showing the surface of an older chamber below. Image courtesy of Jan Pawlowski, University of Geneva. This image first appeared in J. Foram. Res 23:231-237, and is used with permission.
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After gametogenesis, there is very little left of the parent cell. In this image, remnant cytoplasm in the empty test (which has been decalcified to make it more transparent) is being scavenged by a ciliate (arrow). Image courtesy of Susan T. Goldstein, University of Georgia. This image first appeared in J. Foram Res. 23:213-220, and is used with permission.
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View of the holotype. Image courtesy of Jan Pawlowski, University of Geneva. This image first appeared in J. Foram. Res 23:231-237, and is used with permission.
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A closeup of biflagellated foraminiferal gametes leaving the aperture of the parent gamont. The gametes are about 2 um in diameter. Image courtesy of Susan T. Goldstein, University of Georgia. This image first appeared in J. Foram. Res. 23:213-220 and is used with permission.
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Collected off the Ile de Porquerroles, France. The test is about 70 microns across in its long dimension. Image courtesy of Jan Pawlowski, University of Geneva. This image first appeared in J. Foram. Res 23:231-237, and is used with permission.
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A light micrograph of a "vegetative" gamont; i.e., on that has not yet begun the process of producing gametes. The test is approximately 250 um in diameter. Image courtesy of Susan T. Goldstein, University of Georgia. This image first appeared in J. Foram. Res. 23:213-220 and is used with permission.
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Collected off the Ile de Porquerroles, France. Individuals from this area have, among other things, fewer and smaller denticles than is considered typical for the species. Image courtesy of Jan Pawlowski, University of Geneva. This image first appeared in J. Foram. Res 23:231-237, and is used with permission.
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A decalcified test after gamete release. The test is mostly empty; the dark spheres are the remnants of the cytoplasm. Image courtesy of Susan T. Goldstein, University of Georgia. This image first appeared in J. Foram. Res. 23:213-220 and is used with permission.
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This young foram has only a few chambers, and is 30 microns across. Collected off the Ile de Porquerroles, France. Image courtesy of Jan Pawlowski, University of Geneva. This image first appeared in J. Foram. Res 23:231-237, and is used with permission.