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Specimens which cannot be assigned to established species
Taxonomy
Blowiella Krechmar and Gorbachik [according to Verga & Premoli Silva 2003]
Original description: Test planispiral, in the early stages similar to Globigerinella, in the adult becoming somewhat loosely coiled, the earlier coils all visible in side view; chambers globular in the earlier stages, in the adult with lateral prolongations reaching to and slightly over the preceding coil; wall calcareous, perforate; aperture at the base of the last-formed chamber in the median line.- Upper Cretaceous.
Entries in the Catalog of original descriptions: Globigerinelloides
Distinguishing features: Test planispirally enrolled, biumbilicate, involute to evolute, lobulate in outline, chambers globular to somewhat elongate in partially evolute species, sutures depressed; wall calcareous, perforate, optically radial; aperture equatorial and interiomarginal, bordered by a narrow imperforate lip, broad and low to moderately arched, the lateral portions remaining open as relict supplementary apertures around the umbilicus when new chambers are added.
Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): within Valanginian Stage (133.88-139.39Ma, base in Valanginian stage). Data source: Total of range of species in this database
Plot of range and occurrence data:
Loeblich, A. R. & Tappan, H. (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York. 1-1059. gs Moullade, M., Bellier, J. -P. & Tronchetti, G. (2002). Hierarchy of criteria, evolutionary processes and taxonomic simplification in the classification of Lower Cretaceous planktonic foraminifera. Cretaceous Research. 23(1): 111-148. gs Smith, C. C. & Pessagno, E. A. (1973). Planktonic foraminifera and stratigraphy of the Corsicana formation (Maestrichtian) North-central Texas. Cushman Foundation for Foraminiferal Research, Special Publication. 12: 1-67. gs Verga, D. & Premoli Silva, I. (2003a). Early Cretaceous planktonic foraminifera from the Tethys: The large many-chambered representatives of the genus Globigerinelloides. Cretaceous Research. 24: 661-690. gs Verga, D. & Premoli Silva, I. (2003b). Early Cretaceous planktonic foraminifera from the Tethys: The small few-chambered representatives of the genus Globigerinelloides. Cretaceous Research. 24: 305-334. gsReferences:
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Globigerinelloides compiled by the pforams@mikrotax project team viewed: 25-10-2020
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