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Linked specimens: USNM-237348 USNM-185034 USNM-237349 USNM-185033
Current identification/main database link: Abathomphalus intermedius (Bolli, 1951)
Original Description
Etymology:
Extra details from original publication
The origin of Globotruncana pessagnoi, n. sp., is uncertain. It could have been derived from a Globotruncanella-like ancestor similar to Globotruncanella havanensis (Voorwijk) during the late Campanian, or it could have originated from an Archaeoglobigerina-like ancestor. The former phylogeny seems more likely to be the correct one. G. pessagnoi, n. sp., exhibits radial, depressed sutures on the umbilical side. This is a common characteristic in members of the Abathomphalidae, cf. Globotruncanella havanensis (Voorwijk) and Abathomphalus intermedius (Bolli). On the other hand, in vertical section (text-figure 1) Globotruncana pessagnoi shows great similarity to G. arca (Cushman). Both species have the same keel structure and G. pessagnoi n. sp. is morphologically comparable with the second whorl of G. arca (cf. Pessagno, 1967; pl. 96, figs. 7-8, 17).
Globotruncana pessagnoi, n. sp., is similar to Abathomphalus intermedius (Bolli), from which it differs in the less globular nature of its chambers on both spiral and umbilical sides and by having subtrapezoidal chambers rather than subpetaloidal ones on the umbilical side. It also resembles G. arca (Cushman), from which it can be distinguished by being smaller in size and having subtrapezoidal chambers on the umbilical side.
Range: Uppermost Campanian to lowermost Maestrichtian. Upper part of Globotruncana calcarata Zonule to lower part of Globotruncana lapparenti Zonule.
Occurrence: In Texas Globotruncana pessagnoi, n. sp., is abundant in the " Upper Taylor Marl" of Travis and Limestone Counties. In Mexico it is common in the Mendez Shale. It also has been observed in samples of JOIDES Leg 1, Site 4A, Section 1.
Longoria, J. F. (1973b). Longoria, J. F. (1973b). A New Species of Globotruncana from the Upper Cretaceous of Texas and Mexico. Micropaleontology. 19(1): -. Micropaleontology. 19(1): -. gsReferences:
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Globotruncana pessagnoi compiled by the pforams@mikrotax project team viewed: 23-6-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=131474 Go to Archive.is to create a permanent copy of this page - citation notes |
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Comments (2)
Correct ref : original description Longoria, J. F. (1973). A New Species of Globotruncana from the Upper Cretaceous of Texas and Mexico. Micropaleontology. 19(1): 97-100., available online at https://doi.org/10.2307/1484969
thanks added to our ref list now, Jeremy