SEM images of Syracosphaera, Calciosolenia and stradnerlithids (Stradnerlithus and Truncatoscaphus). The Syracosphaeras include modern S. anthos (left) and Tanzanian specimens from the Early Miocene (TDP RAS outcrop sample), Late Eocene (TDP Site 12), Late Paleocene (TDP Site 19) and Turonian (TDP Site 36). Calciosolenia specimens are from the Turonian (TDP Site 31). Stradnerlithid specimens are from the Turonian (TDP Sites 31 and 36).