Abstract: Several hundreds of carapaces and a few valves were picked under a Nikon SMZ645 stereomicroscope from a single sample. Selected specimens were mounted on stubs using carbon conductive adhesive tape, gold coated and scanned with a JEOL JSM-6360LV Scanning Electron Microscope (SEM) at the Servicio de Microscopía Electrónica del Museo de La Plata, La Plata city, Argentina. After examination under SEM, a total of 167 specimens were retained for study regarding their preservation, mainly those with undeformed dorsal and/or lateral outlines. Length...
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