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.
Linked specimens: USNM-170540 USNM-170541
Current identification/main database link: Contusotruncana plicata (White 1928, emended by Solakius and Salaj, 1985)
Original Description
Size:
Etymology:
Extra details from original publication
Remarks.-Globotruncana navarroensis exhibits variation in shape of the periphery, convexity of the spiral surface as observed in axial view, surface ornamentation, and width of the umbilicus. Diagnostic characters of this species are (1) the strongly spiroconvex test, (2) the three ultimate chambers which increase rapidly in width, resulting in the initial spire being asymmetric and offset toward the peripheral margin, and (3) the strongly curved, depressed spiral sutures and radial, depressed umbilical sutures.
Globotruncana navarroensis was derived from G. plummerae Gandolfi through an increase in convexity spirally and the restriction of the double keel to the initial portion of the final whorl. It differs from G. plummerae (1) by being strongly spiroconvex rather than biconvex, (2) in the asymmetric initial spire offset toward the peripheral margin, and (3) by the possession of a double keel (when present) restricted to the initial portion of the final whorl.
Globotruncana navarroensis differs from G. patelliformis Gandolfi (1) by generally having a more lobate equatorial periphery, (2) by having an asymmetrically placed initial spire, and (3) by having chambers in the final whorl which spirally are crescentic to somewhat petaloid and wide, rather than crescentic and narrow.
Range: G. contusa-stuartiformis Assemblage Zone, G. gansseri Subzone, G. aegyptiaca Zonule, to upper part of R. fructicosa Zonule.
Occurrence: Globotruncana navarroensis n. sp., has been observed only from the Corsicana Formation of Texas. The specimen figured by EI-Naggar (1971a, pI. 6, fig. i) as Globotruncana sp. from the Maestrichtian Men dez Shale of Tampico, Mexico, is included herein, although no specimens of G. navarroensis, n. sp., were observed from the Mendez during the course of this investigation. Examination of both biostratigraphically older and younger stratigraphic units in the western Gulf Coastal Plain indicates that G. navarroensis is restricted, insofar known, to the middle Maestrichtian (G. gansseri Subzone).
Smith, C. C. & Pessagno, E. A. (1973). 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. Cushman Foundation for Foraminiferal Research, Special Publication. 12: 1-67. gs OReferences:
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Globotruncana navarroensis compiled by the pforams@mikrotax project team viewed: 20-6-2025
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