Scale bar = 10 µm
S. elegans has large valves (110-400 µm in length, 35-90 µm in width) with coarse undulations (12-21/100 µm), and has previously been found in Alaska (Foged, 1981).
Valve arcuate to slightly reniform
Slight constricted central area
Parallel striae, rounded at apices
Strongly capitate apices
Break in fibulae with 4-6 striae
heteropolar valves
clavate to rhombic, widest at mid-valve
valves tumid at center
valves gradually narrow
rounded headpole and footpole
one isolated pore present close to central striae