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Species Globorotaloides hexagona Natland 1938 | ||||||
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| Diagnosis / Definition: | ||||||
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Kennett & Srinivasan (1983): Test very low trochospiral, spiral side almost flat; equatorial periphery lobulate, axial periphery broadly rounded; chambers spherical, five in the final whorl, increasing rapidly in size as added; sutures on both spiral and umbilical sides slightly curved to nearly radial, depressed; surface distinctly cancellate, with large pores set in deep hexagonal-funnel-like pore pits ; umbilicus fairly wide, partly covered by apertural plate; aperture interiomarginal, umbilical-extraumbilical, a very low arch bordered by a distinct apertural plate or thick rim. |
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| Discussion / Comments: | ||||||
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Kennett & Srinivasan (1983): Gd. hexagona exhibits a wide range of variation in the inflation and size of chambers and in apertural characters. It is usually distinguished by its five to six globular, inflated chambers in the final whorl, which are individually more distinct and less embracing than in Gd. variabilis. Srinivasan (1975): Globorotaloides suteri (Bolli) is probably synonymous with this species, as has been mentioned by Todd (1964) and Lipps (1964). The relative abundance of this species may be due to its solution-resistant test. A very close similarity in surface ultramicrostructure of G. hexagona and of Protentella (Clavatorella) bermudezi suggests a close phylogenetic relationship between the two taxa. Chaisson & Leckie (1993): Remarks: This is a relatively rare species in Hole 806B. The spiral side is nearly flat, and the sutures on the spiral side are radial or slightly curved. There are usually five chambers in the final whorl, but individuals with four were also found. Often the final chamber is much larger than the penultimate chamber. The aperture is arched slightly and bordered by a rim or a narrow plate. The wall is coarsely cancellate. Similar species: Neogloboquadrina dutertrei is not as distinctly cancellate, and the chambers do not increase as rapidly in size as those of Globorotaloides hexagona. Also see G. variabilis. |
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| Systematics: | ||||||
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3 Classis Foraminifera Genus Globorotaloides Species Globorotaloides hexagona |
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| Synonym list: | ||||||
| Kennett & Srinivasan (1983): 1938 Globigerina hexagona Natland. - Natland : p.149 pl 7 figs la-c
Srinivasan (1975): 1938 Globigerina hexagona Natland. - Natland : p.149 pl. 7; fig. 1
1975 Globorotaloides hexagona Natland. - Srinivasan : p.149 pl. 4; fig. 16
Vincent & Toumarkine (1990): 1938 Globigerina hexagona Natland. - Natland : p.149 pl.7, fig.1
1990 Globorotaloides hexagona Natland. - Vincent & Toumarkine : p.834 pl.5, figs.1-2
Chaisson & Leckie (1993): 1938 Globigerina hexagona Natland. - Natland : p.149 pl. 7; fig. 1a-c
1983 Globorotaloides hexagona Natland. - Kennett & Srinivasan : p.216 pl. 54; fig. 1, 3-5
1993 Globorotaloides hexagona Natland. - Chaisson & Leckie : p.177 pl. 9; fig. 4
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| References: | ||||||
Natland,M.L. (1938): Srinivasan,M.S. (1975): Kennett,J. and Srinivasan,M.S. (1983): Vincent,E. and Toumarkine,M. (1990): Chaisson,W.P. and Leckie,R.M. (1993): |
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| Anonymous: Unedited TaxonConcept data | ||||||
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