Catalog - Globigerinita naparimaensis

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Globigerinita naparimaensis

Citation: Globigerinita naparimaensis Brönnimann 1951

Type locality: Naparima area, South Trinidad, BWI.

Type age (chronostrat): Globorotalia menardii and G. mayeri zone, lower Miocene

Type sample (& lithostrat): Lengua Beds, Cruse Formation

Type specimens: Text figures 1-14.

Original Description
Test rather small, distinctly trochoidal, spire with two to three whorls. Chambers subglobular, gradually increasing in size, non-enveloping. Adult with three to four usually fairly large and well separated subglobular chambers. Initial chamber very small and normally not visible. Umbilical region of adult covered with a single, irregularly shaped and frequently inflated supplementary chamber, branching out into the sutural grooves. Multiple aperture of the adult consists of small semicircular openings, with minute lips, along the sutures of the supplementary chamber. Openings frequently at the end of short, lateral processes as in some types of Globigerinatella insueta (1950, pl. 14, fig. 9). Globigerina chambers formed prior to the supplementary growth possess single, large, broad semicircular apertures, with minute lips. No multiple apertures are developed as in the final Globigerina stage of Globigerinatella insueta. Walls are finely perforate and vary somewhat in thickness. Wall of supplementary chamber may be very thin, glass-like and transparent, but in general it is of much the same texture as that of the adult Globigerina chambers.

Size: The largest diameters measured across the umbilical side range from 157 µm to 330 µm

Extra details from original publication
Occurence: Globigerinita naparimaensis occurs in the Globorotalia menardii and G. mayeri zone, Lengua Beds, Cruse Formation, lower Miocene, Naparima area, South Trinidad, BWI.

References:

Bolli, H. M., Loeblich, A. R. & Tappan, H. (1957). Planktonic foraminiferal families Hantkeninidae, Orbulinidae, Globorotaliidae and Globotruncanidae. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin. 215: 3-50. gs V O

Brönnimann, P. (1951a). Globigerinita naparimaensis n. gen., n. sp., from the Miocene of Trinidad, B. W. I. Contributions from the Cushman Foundation for Foraminiferal Research. 2(1): 16-18. gs V O

CATALOG OF ORIGINAL DESCRIPTIONS: Globigerinita naparimaensis Brönnimann 1951

Globigerinita naparimaensis

References:

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