Amphora Ehrenberg ex Kutzing


Frustules biraphid, asymmetrical to the apical axis, symmetrical to transapical axis. Valve mantle on dorsal margin deeper (= higher) that on ventral margin making the valve arched and not entirely in focus at one focal plane. Raphe not central, eccentric to strongly eccentric, straight, arched or slightly sigmoid. Striae on dorsal margin usually crossed by hyaline areas, striae on ventral margin short, sometimes difficult to see depending on the position of the valve. Stigmata lacking, terminal nodules indistinct.

Light Microscope Image(s)

Each image is accompanied by the genus and species, California Academy of Sciences slide number (ie. CAS 612010), location of the specimen on the slide, and dimension in microns.