Figure 57: Glomerulus (coloured) in Glomalveolina lepidula (Schwager) from Tremp, Northern Spain, Ilerdian. Approximately equatorial section with small, ?microspheric proloculus and axial section with large, ?megalospheric proloculus. Incident light.
f: foramen; icf: intercalary foramen; pop: postseptal passage; prp: praeseptal passage; s: septum; sl: septulum; wsut: whorl suture (enlarged by slight deformation).