Velum occurs as a narrow, rounded ridge forming the valve margin in lateral view, continuous posteriorly as the dolon in females.
Source: wiktionary
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Velum occurs as a narrow, rounded ridge forming the valve margin in lateral view, continuous posteriorly as the dolon in females.
Source: wiktionary
Margin of dolon curling smoothly to distal margin of velum both anteriorly and posteriorly, but dolonal margins not in contact when valves closed.
Source: wiktionary