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You are in: Home>>character sets>>Central, axial and hyaline areas>>Central area, shape
Central area, shape
Description
If central area reaches valve margin on one or both sides, see under 'hyaline areas'.
Comment: Note: central area sometimes reaches margin
State: Diamond
Brachysira vitrea |
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State: Butterfly
Sellaphora pupula deme 'blunt' |
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State: Rectangular
Synedra ulna |
Planothidium lanceolatum (raphe valve) |
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State: Transverse elliptical
Navicula radiosa |
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State: Longitudinal elliptical
Navicula cincta |
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State: Rounded
valve view brightfield Caloneis crassa raphe valve |
Raphe valve view Brightfield Cocconeis placentula raphe valve |
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State: Narrow (like axial area)
Fragilariforma virescens |
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State: No central area
Eunotia pectinalis |
Description
Applies to taxa with striae extending across the entire width of the valve
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