BOWN, Paul R., Jeremy R. YOUNG, & Jacqueline A. LEES 2017 (Mar. 31) On the Cretaceous origin of the Order Syracosphaerales and the genus Syracosphaera Journal of Micropalaeontology 36: 153-165, 8 figs. Syracosphaera antiqua, S. repagula, Pocillithus macleodii, P. crucifer, Stradnerlithus wendleri, S. haynesiae and Tortolithus foramen