The species names discussed below are combined because they include transitional forms, because their separation does not improve the biostratigraphy, or because there is no consensus about the species concept.
Globigerina ouachitensis Howe and Wallace, 1932 (including Globigerina ouachitensis gnaucki Blow and Banner, 1962, in Bolli and Saunders, 1985: fig. 13.16).
Globigerinoides elongatus/obliquus extremus. Globigerinoides elongatus (d'Orbigny, 1826) and Globigerinoides obliquus extremus Bolli and Bermudez, 1965 are not separated in this study.
Globigerinoides trilobus/immaturus. Globigerinoides trilobus (Reuss, 1850) and Globigerinoides immaturus Le Roy, 1939, are not separated.
Globigerinoides trilobus/sacculiferus transition. This is a transitional form between Globigerinoides trilobus (Reuss, 1850) and Globigerinoides sacculiferus (Brady, 1877).
Globorotalia cerroazulensis/cocoaensis transition (Toumarkine and Luterbacher, 1985: fig. 36.13-15).
Globorotalia cerroazulensis/pomeroli transition (Toumarkine and Luterbacher, 1985: fig. 35.1-3).
Globorotalia cocoaensis/cunialensis transition (Toumarkine and Luterbacher, 1985: fig. 36.7-9).
Globorotalia miozea/conoidea. Globorotalia miozea Finlay, 1939, and Globorotalia conoidea Walters, 1965, are not separated.
Globorotalia sp. cf. G. hirsuta. Our forms differ from Globorotalia hirsuta by having a flat or almost flat spiral side.
Globorotalia fohsi peripheroronda Blow and Banner, 1966. Small specimens of forms close to Globorotalia kugleri (also mentioned by Iaccarino and Premoli Silva, 1979, for Hole 398D, Leg 47B) were found in the upper Oligocene to lower Miocene of the studied samples. They are regarded as a variation of Globorotalia fohsi peripheroronda.
Globorotalia opima nana/opima opima transition (Bolli and Saunders, 1985: fig. 26.21-23).
Globorotalia tosaensis Takayanagi and Saito, 1962 (including Globorotalia tosaensis tenuitheca Blow, 1969, in Bolli and Saunders, 1985: fig. 37.7-9).
Globorotalia truncatulinoides (d'Orbigny, 1839), (including Globorotalia truncatulinoides pachytheca Blow, 1985, in Bolli and Saunders, 1985: fig. 37.6).
Neogloboquadrina humerosa Takayanagi and Saito, 1962, including Neogloboquadrina praehumerosa Natori, 1976, in Bolli and Saunders, 1985: fig. 27.9. Stainforth et al., 1975, show pictures of both five-chambered (considered to be N. praehumerosa) and six-chambered specimens of N. humerosa (considered to be N. humerosa) in fig. 170.1-6.
Neogloboquadrina pachyderma Ehrenberg, 1861 (including Globigerina borealis Brady, 1881, in Iaccarino, 1985: fig. 5.6).
Hantkenina alabamensis/primitiva. The species Hantkenina alabamensis Cushman, 1925, and Hantkenina primitiva Cushman and Jarvis, 1929, are not separated.
Pulleniatina obliquiloculata/inflata transition. This is a transitional form between Pulleniatina obliquiloculata Parker and Jones, 1865, and Globorotalia inflata (d'Orbigny, 1939).
Truncorotaloides rohri/topilensis transition. This is a transitional form between Truncorotaloides rohri Brönnimann and Bermudez, 1953, and Truncorotaloides topilensis (Cushman, 1925).