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Species Globigerina (Zeaglobigerina) nepenthes Todd 1957 |
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| Diagnosis / Definition: |
Kennett & Srinivasan (1983):
Test compactly coiled except for the last-formed protruding chamber, low to high spire, chambers indistinct, slightly inflated, four in the final whorl; sutures obscured on earlier chambers due to test thickening, radial to slightly curved on later chambers, slightly depressed. Surface cancellate with distinct pore pits and interpore ridges. Aperture a broad arch at the umbilical edge of the protruding final chamber, ordered by a thickened rim. |
| Discussion / Comments: |
Kennett & Srinivasan (1983):
Gg. (Zg.) nepenthes differs from its ancestor Gg. (Zg.) druryi primarily in its protruding thumb-shaped final chamber. The characteristic cancellate surface and apertural
rim suggest its placement within the subgenus Zeaglobigerina. Gg. (Zg.) nepenthes exhibits a wide range of variation in size and shape of the final chamber, and test thickening, which resulted in the erection of several new
species and subspecies such as Globigerina picassiana Perconig, 1968 and Globigerina nepenthes delicatula Bronnimann and Resig, 1971. They are here considered to be phenotypic variants of Gg. (Zg.) nepenthes. |
| Synonym list: |
Kennett & Srinivasan (1983):
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| References: |
Todd,R. (1957):
Smaller foraminifers.
In: Geology of Saipan, Mariana Islands (Pt. 3) Paleontology, US. Geological Survey Professional Papers280-H p. 265-320
Kennett,J. and Srinivasan,M.S. (1983):
Neogene Planktonic Foraminifera - A Phylogenetic Atlas.
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