Figure 8 in Systematic taxonomy of middle Miocene Sphaeroidinellopsis (planktonic foraminifera)

Figure 8. Sphaeroidinellopsis phylogeny. Sphaeroidinellopsis disjuncta appeared from Globoturborotalita woodi in the early Miocene, giving rise to two different lineages. With a progressive elongation of the last chamber, the transition to S. kochi took place at the end of the early Miocene. The second lineage arose from the three-chambered populations giving rise to S. seminulina, leading to the Sphaeroidinella lineage. Globoturborotalita woodi is provisionally retained as the ancestor according to the literature and in the absence of transitional individuals between G. druryi or G. labiacrassata and S. disjuncta.