CATALOG OF ORIGINAL DESCRIPTIONS: Turborotalia (Turborotalia) vincentae Fleisher 1974

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 -> T -> Turborotalia (Turborotalia) -> Turborotalia (Turborotalia) vincentae
Other pages this level: T. (Turborotalia) nigriniae, T. (Turborotalia) vincentae

Turborotalia (Turborotalia) vincentae

Citation: Turborotalia (Turborotalia) vincentae Fleisher 1974
Rank: species
Type age (chronostrat): N.18 (Early Pliocene)
Type sample (& lithostrat): Hole 219, Core 7, Section 2, 73-75 cm.

Linked specimens: USNM-211520 USNM-211518 USNM-211519 USNM-211517

Current identification:


Original Description
The test is large for species of this genus and consists of nine or more chambers arranged in a low trochospire. The final whorl consists of four or rarely five chambers, which increase slowly in size. The surface texture is cancellate, but wall thickening tends to produce a relatively smooth, regularly perforate appearance. The primary cancellate structure can be observed, on the holotype, in the wall of the penultimate chamber near the spiral suture. The chambers are much inflated, subglobular, and closely appressed, producing, particularly in four-chambered forms, a highly compact test. Dorsal sutures are straight, radial, and moderately depressed. The early chambers in the trochospire are obscured by secondary wall thickening, particularly over the initial whorl. The periphery is very broadly rounded and moderately lobate. Ventral sutures are distinct and deeply depressed. The final chamber, which is somewhat larger and more inflated than those immediately preceding it, projects slightly toward the umbilicus, out of the plane of coiling. The most distinctive feature of this species is an elongate and imperforate flap or flange, commonly bordered along part orall of its length by a thickened rim, which covers the umbilical region and extends in an anterior direction part or all of the way to the periphery. In specimens from which this flange has been removed (Plate 21, Figure 4), the umbilicus is seen to be a broad, deep depression, and the aperture is a low, elongate, extraumbilical to peripheral arch bordered by an imperforate region on the laterally directed apertural face.

Size: Maximum diameter of the holotype is 0.45 mm; the axial elevation is 0.30 mm

Etymology: This species is named for Dr. Edith Vincent, currently of the University of Southern California.  

Extra details from original publication
Remarks: This species most clearly resembles T. (T.) pseudopima Blow, to which it is probably related. T. (T.) pseudopima differs from T. (T.) vincentae in having a flatter dorsal side and a much less open umbilicus and in lacking the apertural-umbilical flange. T. vincentae differs from other species which possess a similar flange, notably T. (T.) humerosa humerosa (Takayanagi and Saito) and T. (T.) acostaensis tegiliata (Brönnimann and Resig) in typically having fewer but much more inflated and closely appressed chambers in the final whorl.

Stratigraphic Range: Middle N.17 to late N.18, 7N.21. The questionable occurrences may be reworked.

References:

Fleisher, R. L. (1974a). Cenozoic planktonic foraminifera and biostratigraphy, Arabian Sea, Deep Sea Drilling Project, Leg 23A. Initial Reports of the Deep Sea Drilling Project. 23: 1001-1072. gs V O


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Turborotalia (Turborotalia) vincentae compiled by the pforams@mikrotax project team viewed: 30-7-2021

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