(Moore ex Ralfs) Crawford 1988 Category: Centric
BASIONYM: Melosira arenaria
SEM scalebar = 10 µm
Site ID: MDC 492301
Site Name: Giant Springs, Cascade County, MT
Caption: Mantles at junction between two sibling valves, intaglio valve at left and cameo valve at right
Notes: Note stepped mantle of cameo valve (right), external openings of fultoportulae, and crenulate junctions between mantles and valvocopulae.