SEM scalebar = 2 µm

Site ID: Iowa Lakeside Lab 2012 T_0_1

Site Name: Toolik Lake sediment, Alaska North Slope

Latitude: 68.63

Longitude: -149.60

Caption: detail, external valve face

Notes: The external expression of a rimoportula is in the bottom, center of the image. The simple opening is positioned near the end of a short stria. The striae are multi-seriate.

Contributor: William Daniels - June 2012