Globorotalia fohsi peripheroronda Blow & Banner 1966 from: Bolli, H.M.Saunders, J.B. (1985): Oligocene to Holocene low latitude planktic foraminifers. In: Plankton Stratigraphy Eds: Bolli, H.M.Saunders, J.B. p. 155-262 | . |
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Subspecies Globorotalia fohsi peripheroronda Blow & Banner 1966 |
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Bolli & Saunders (1985):
This is the earliest and most primitive subspecies of the fohsi lineage. It possesses 5-6 chambers in the last whorl, is slightly elongate in equatorial view, as is typical for all fohsi subspecies except for the end form robusta, which tends to be more circular in outline. Characteristic for the subspecies is the bluntly rounded periphery. Prior to the erection of peripheroronda, specimens of this kind were widely recorded under the name barisanensis, based on the description and holotype figure of its author LeRoy. In rechecking the holotype, Blow & Banner (1,966) determined its periphery, described by LeRoy as subrounded and lobulate, to be in fact fully carinate. This prompted Blow & Banner to erect the new taxon peripheroronda for specimens with a bluntly rounded periphery. The species with which the subspecies peripheroronda can most easily be mistaken are its direct descendant peripheroacuta, and also G. mayeri and G. kugleri. From peripheroacuta it differs in the rounded instead of acutely compressed periphery, in particular in the later chambers of the last whorl. G. mayeri, which is often larger in size, has a slower rate of growth of the chambers of the last whorl and therefore has a more circular equatorial outline. the intercameral sutures on the spiral side of G. mayeri are usually close to radial, not swept back as in peripheroronda. In peripheral view the spiral and umbilical sides are practically equally inflated in G. mayeri, whereas in peripheroronda the spiral side appears slightly more flattened compared with the umbilical side. G. fohsi peripheroronda differs from G. kugleri in possessing only 5-6 chambers in the last whorl against 7-8 in kugleri, and in the equatorial outline tending to be slightly more elongate, less circular. In size peripheroronda is often slightly larger than kugleri. |
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Bolli & Saunders (1985):
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| References: |
Blow,W.H. and Banner,F.T. (1966):
The morphology, taxonomy and biostratigraphy of Globorotalia barisanensis LeRoy, Globorotalia fohsi Cushman and Ellisor, and related taxa . Micropaleontology Vol. 12(3) p. 286-302
Bolli,H.M. and Saunders,J.B. (1985):
Oligocene to Holocene low latitude planktic foraminifers.
In: Plankton Stratigraphy Eds: Bolli, H.M.Saunders, J.B. p. 155-262
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