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Achnanthes: heterovalvular, one valve with and one without a raphe, flexed in girdle view, either solitary or in<br />
chains joined at the valvular surface, attached to substrate either by mucilage pad or by a stalk at the valve<br />
apex, valves ellipitical with rounded or protracted apices, striation and central area variable.<br />
http://craticula.ncl.ac.uk/EADiatomKey/html/Achnanthes.html<br />
Sometimes the striation and central areas of the raphed and<br />
rapheless valve can be different
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