Diatoms of North AmericaDiatoms of North America
Return to overview

Guide to Stephanodiscus hantzschii

Grunow in Cleve and Grunow 1880

Stephanodiscus Hantzschii Guide
Credit: David Burge
  1. Valve face flat
  2. Spines prominent
  3. Rimoportula present at face/mantle junction
  4. Annulus may be present
  5. Fascicles triseriate

Valves with a flat face. Central fultoportulae are absent. Prominent spines are present at each interfasicle (7-9 in 10 µm). A single rimoportula is located on an interfasicle near the valve face/mantle junction. In some specimens, an annulus is present. Fascicles are uniseriate in the center, becoming biseriate to triseriate. Areolae are easily resolved.