Chaisson & Pearson (1997):
D. altispira also varies greatly morphologically. In Sample 154-925B-26H-5, 65-67 cm, specimens are very compressed and nearly quadrate in umbilical view, while in Sample 154-925B-25H-5, 65-67 cm, D. altispira specimens
have a high trochospire and their chambers are more inflated.
Chaisson & Leckie (1993):
Remarks: This species exhibits a broad spectrum of morphologic
variation that has been demarcated into subspecies by some authors (Bolli,
1957; Kennett and Srinivasan, 1983; Bolli and Saunders, 1985). Very few
specimens of the Dentoglobigerina altispira globosa morphotype were
observed in Hole 806B; therefore, all specimens were assigned to D. altispira
(e.g., see Plate 9, Fig. 12). This taxon is characterized by its well-developed
apertural teeth, appressed chambers, deep umbilicus, and moderate
to high trochospire.
Similar species: Early forms of D. altispira are larger than Globoquadrina
cf. G. extans. In addition, D. altispira has a wider umbilicus and better
developed apertural teeth. |
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Berggren,W.A.; Hilgen,F.J.; Langereis,C.G.; Kent,D.V.; Obradovich,J.D.; Raffi,I.; Raymo,M.E. and Shackleton,N.J. (1995): Late Neogene chronology: New perspectives in high-resolution stratigraphy . Geological Society of America Bulletin Vol. 107(11)
Chaisson,W.P. and Pearson,P.N. (1997): Planktonic foraminifer biostratigraphy at Site 925: middle Miocene–Pleistocene. In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 154 Eds: Shackleton, N.J.Curry, W.B.Richter, C.Bralower, T.J.
Chaisson,W.P. and d'Hondt,S.L. (2000): Neogene planktonic foraminifer biostratigraphy at Site 999, Western Caribbean Sea. In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 165 Eds: Leckie, R.M.Sigurdsson, H.Acton, G.D.Draper, G. p. 19-56
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