Biomineralization Within Vesicles: The Calcite of Coccoliths
Biomineralization Within Vesicles: The Calcite of Coccoliths
Biomineralization Within Vesicles: The Calcite of Coccoliths
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<strong>Biomineralization</strong> <strong>Within</strong> <strong>Vesicles</strong> 199Figure 6. Coccolith structure in representative genera. (A) Emiliania huxleyi, diagram <strong>of</strong> crystal units;cross-polarized light micrograph <strong>of</strong> a coccolith (N.B. this micrograph is <strong>of</strong> Pseudoemiliania lacunosa aclosely related fossil species with larger coccoliths); SEM <strong>of</strong> isolated coccolith in distal view. (B) Biscutummagnum, a fossil species from the Late Cretaceous: diagram <strong>of</strong> crystal units, cross-polarized lightmicrograph, and SEMs <strong>of</strong> distal and proximal surfaces. (C) Ophiaster hydroideus, an extant species from aplankton sample: diagram <strong>of</strong> crystal units and SEM <strong>of</strong> partially disintegrated coccolith. All scale bars onemicrometer, double headed arrow symbols indicate orientation <strong>of</strong> calcite c-axis.
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