CATALOG OF ORIGINAL DESCRIPTIONS: Globigerinoides subquadratus praesubquadratus Ouda 1998

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> G -> Globigerinoides -> Globigerinoides subquadratus praesubquadratus
Other pages this level: << < G. rubriformis, G. sacculifer brachysacculifer, G. sacculifer minimus, G. sacculifer spinulosus, G. sacculifera subsacculifera, G. sacculiferoides, G. sacculiferus immatura, G. sacculiferus irregularis, G. semiinvoluta, G. semiinvolutus, G. sicanus, G. sicanus praesicanus, G. subconglobatus micra, G. subconglobatus subconglobata, G. subquadrata, G. subquadratus praesubquadratus, G. subquadratus subelongatus, G. suleki, G. tapiesi, G. tenella, G. transitoria, G. triloba altiapertura, G. triloba aspera, G. trilobus bullatus, G. tyrrhenicus

Globigerinoides subquadratus praesubquadratus

Citation: Globigerinoides subquadratus praesubquadratus Ouda 1998
Rank: sub-species
Type locality: Khalda SD-1, N. Western Desert, depth 1850-1800 feet
Type age (chronostrat): Late Oligocene
Type specimens: Pl. I, Figs. 7-13C, Pl. II, Fig. 6.
Described on page(s) : 18-19

Current identification:


Original Description
Globigerinoides praesubquadratus develops from Globigerina brazieri Jenkins by the rapid increase in the size of chambers of the last whorl as added and by the acquisition of a sutural supplementary aperture at the base of the dorsal side of the ultimate chamberis. It is distinguished from Gs. subquadratus by its possession of only one sutural supplementary aperture on the dorsal side of the adult test, and by having a very restricted stratigraphical occurrence. Globigerinoides subquadratus is stratigraphically younger and seems to represent a highly evolved member of the lineage Gg. brazieri-Gs. praesubquadratus. Globigerinoides praesubquadratus differs from Gs. primordius by having a fewer, more inflated, rapidly increasing chambers in the last whorl and in possessing a more highly arched primary aperture.

Extra details from original publication
Observed stratigraphic range: Late Oligocene, corresponding to Zone P22 as redefined by Berggren & Miller (1988).

References:

Ouda, K. (1998). Primitive Globigerinoides in the Late Oligocene of the Northern Western Desert, Egypt: a contribution to the orgin and evolution of the genus Globigerinoides. Bulletin of Faculty of Science, Assiut University. 27: 13-40. gs


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Globigerinoides subquadratus praesubquadratus compiled by the pforams@mikrotax project team viewed: 14-5-2021

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