Figure 11. Trilobatus sacculifer with incipient protuberances and intergradation with Globigerinoidesella fistulosa. A–J in Systematic taxonomy of the Trilobatus sacculifer plexus and descendant Globigerinoidesella fistulosa (planktonic foraminifera)

Figure 11. Trilobatus sacculifer with incipient protuberances and intergradation with Globigerinoidesella fistulosa. A–J, Trilobatus sacculifer (Brady, 1877); K–P, Globigerinoidesella fistulosa (Schubert, 1910). A–J, ODP Site 1115, Woodlark Basin, western Pacific; 10H/04/127–129 cm (A, D, J, umbilical view, in A note kummerform final sac-like chamber; B, C, H, I, spiral view, in B note kummerform final sac-like chamber); E–G, ODP Site 1115, Woodlark Basin, western Pacific; 11H/04/25–27 cm (E, umbilical view; F, G, spiral view). K, L, O, P, ODP Site 1115, Woodlark Basin, western Pacific; 10H/04/127–129 cm (K, spiral view; L, umbilical view; note multiple small protuberances and broad flattened final chamber; O, P, umbilical view); M, N, ODP Site 1115, Woodlark Basin, western Pacific; 11H/04/25–27 cm (umbilical view). Scale bars = 100 Lm.