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Linked specimens: USNM-219457
Current identification/main database link: Tenuitella gemma (Jenkins 1966)
The very small-sized test is a spirally flat trochospire of about 12 chambers with 5 chambers in the last whorl which first slowly then rapidly increase in size as added. The early chambers of the trochospire are masked by secondary shell material and strong pustules. The cameral sutures on the spiral and umbilical sides are radial and broadly incised, recalling those of Globigerina ciperoensis angulisuturalis Bolli, 1957.
Between the ultimate and the penultimate chamber,the suture is about 8 microns wide. The outline, as seen in dorsal and ventral view, is lobate. The subglobular chambers are somewhat flattened on the dorsal and convex on the ventral side, and pointed toward the small umbilicus. The aperture is a very small, low, umbilical-extraumbilical arch, which does not reach the periphery of the test. It is similar to that of Globorotalia (T.) nkbrowni Brönnimann and Resig, n. sp. It is provided with a slightly protruding, small plate-like lip with coarsely pustulate margin. Aperture and lip are shown in detail by the scanning micrographs, Plate 42, Figures 4, 6, 7 and 9. The calcareous wall is perforate and the surface is strongly pustulate. The scanning micrograph of the umbilical side of the holotype exhibits relatively large pores of 2 to 3 microns in diameter which are surrounded by numerous minute pustules. From this minutely pustulate surface protrude irregularly distributed much larger, blunt to pointed pustules of 5 to 9 microns in diameter. These larger pustules are composite formations. Some of the larger pustules may fuse and develop short, more or less continuous ridges as shown by the scanning micrograph of a paratype, Plate 42, Figure 1.
Size: The maximum diameter of the holotype is 125 microns; its axial height about 75 microns. The specimen coils to the right. It is from Hole 64.1, Core 7, Section 2, Zone N. 3. The holotype is illustrated on Plate 42, Figures 2 and 3. The species is named for R. Cifelli, Smithsonian Institution, Washington, D. C, U.S.A.
Extra details from original publication
By its small, low, arched umbilical-extraumbilical aperture and its strongly pustulate surface, and by the wide sutural depressions, Globorotalia (T.) cifellii,n. sp., differs from all other small turborotaliids.
Paratypes from Hole 64.1, Core 7, Section 2 range in maximum diameter from about 100 to 175 microns.
Most of them coil to the right.
Globorotalia (Turborotalia) cifellii compiled by the pforams@mikrotax project team viewed: 30-7-2021
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