The Late Cretaceous (late Campanian-Maastrichtian) planktonic foraminiferal genus Rugotruncana Bronnimann and Brown, 1956 is thoroughly revised. The genus is monospecific, with Rugotruncana circumnodifer (Finlay, 1940) being the only species included within it. Taxonomic revision of the genus was made by examination of type specimens of all species assigned to Rugotruncana in the past. The genus is characterized by the presence of an imperforate band and a weakly to strongly developed double keel along the test periphery. In addition, detailed scanning electron microscope observations reveal that the test ornamentation is asymmetrical, with variably developed rugae and costellae being parallel to the periphery on the spiral side and meridional on the umbilical side. These features serve to distinguish Rugotruncana from Rugoglobigerina and GLOBOTRUNCANA: Based on the morphological features revealed by the detailed test ultrastructure and ornamentation observations, Rugotruncana is included within Family Rugoglobigerinidae. A new paleontological species concept is proposed to accommodate Rugotruncana circumnodifer and other species of Cretaceous planktonic foraminifera.

West: -33.0558 East: 178.1300 North: -16.4413 South: -65.0938

Expedition: 113

Site: 113-689

Site: 113-690

Expedition: 114

Site: 114-698

Site: 114-700

Expedition: 119

Site: 119-738

Expedition: 122

Site: 122-761

Site: 122-762

Provider: SEDIS Publication Catalogue

Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=10.2113/gsjfr.37.2.150 (c.f. for more detailed metadata)

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