CATALOG OF ORIGINAL DESCRIPTIONS: Subbotina kiersteadae Fleisher 1974
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Original Description "The large, compact, globigeriniform test contains at least eight chambers arranged in a low trochospire, with three and one-half to four in the final whorl. The test wall is coarsely perforate, but in some specimens secondary thicknening results in a crust-like appearance (figs. 7,8). The typically thick wall (fig.6) results from an accumulation of microcrystallites in interpore areas. Distinct pore pits are sometimes, but not consistently apparent. The dorsal side is flatteded but not planar. Dorsal sutures are straight to slightly curved, depressed, and distinct. The dorsal surfaces of the chambers are slightly inflated. The periphery is rounded and somewhat lobate. In ventral view, the test is subcircular to subquadrate, and the moderately inflated chambers are globular to subglobular. In some specimens, the last few chambers are distinctly compressed. The ventral sutures are deeply incised. The umbilical aperture is typically quadrate and is located within a broad umbilical depression. Wall thickening is commonly present around the margins of the umbilicus. Size: Maximum diameter of the holotype is 0.43 mm. Etymology: This species is named for Professor Caroline Kierstead, formerly Professor of Geology at Smith College, Northampton, Massachusetts. Extra details from original publication Remarks: Subbotina kiersteadae differs from S. eocaena in possessing a thicker wall, a larger, more quadrate aperture, a typically subquadrate outline, and a flattened dorsal surface. It has more chambers in the final whorl than S. finlayi (Brönnimann), and a larger, more open aperture, a more distinct umbilicus, and a flatter dorsal side than S. hornibrooki (Brönnimann). S. kiersteadae may be differentiated from S. achtschacujmensis (Chalilov) in having a more quadrate test with more closely appressed chambers and a greater dorso-ventral thickness. Some forms (Plate 16, Figure 4) possess more globular chambers and a less subquadrate outline than the holotype and resemble S. eocaena. An additional morphotype (Plate 16, Figures 8, 9), which intergrades with the forms represented by the holotype, includes small compact tests with a more spherical or subspherical shape and a less flattened dorsal surface, as well as a more restricted, somewhat slit-like aperture. This form is most common near the base of the range of S. kiersteadae, and probably gave rise to Globigerinatheka senni (Beckmann) by an additional lateral restriction of the aperture and an increase in the height of the trochospire.
Stratigraphic Range: Late P.8 to P.11 at Sites 219 and 220.
References:
Fleisher, R. L. (1974a). Cenozoic planktonic foraminifera and biostratigraphy, Arabian Sea, Deep Sea Drilling Project, Leg 23A. Initial Reports of the Deep Sea Drilling Project. 23: 1001-1072. gsO
Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (2006a). Taxonomy, biostratigraphy, and phylogeny of Eocene Globigerina, Globoturborotalita, Subbotina, and Turborotalita. In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 41(Chap 6): 111-168. gsO
Subbotina kiersteadae compiled by the pforams@mikrotax project teamviewed: 11-4-2026
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Eocene_Atlas_pl06-17_fig16.jpg
Eocene_Atlas_pl06-17_fig16.jpg
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