Taxonomic revision of the late Campanian-Maastrichtian (Late Cretaceous) planktonic foraminiferal genus Rugotruncana Brönnimann and Brown, 1956, and a new paleontological species concept for planktonic Foraminifera

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doi: 10.2113/gsjfr.37.2.150
Author(s): Georgescu, Marius D.; Huber, Brian T.
Author Affiliation(s): Primary:
University of Saskatchewan, Department of Geological Sciences, Saskatoon, SK, Canada
Smithsonian Institution National Museum of Natural History, United States
Volume Title: Journal of Foraminiferal Research
Source: Journal of Foraminiferal Research, 37(2), p.150-159. Publisher: Cushman Foundation for Foraminiferal Research, Ithaca, NY, United States. ISSN: 0096-1191 CODEN: JFARAH
Note: In English. 36 refs.; illus., incl. 5 plates
Summary: 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.
Year of Publication: 2007
Research Program: ODP Ocean Drilling Program
Key Words: 10 Paleontology, Invertebrate; Atlantic Ocean; Australasia; Cretaceous; Exmouth Plateau; Foraminifera; Holotypes; Indian Ocean; Invertebrata; Kerguelen Plateau; Leg 113; Leg 114; Leg 119; Leg 122; Maud Rise; Mesozoic; Microfossils; Morphology; New Zealand; North Island; ODP Site 689; ODP Site 690; ODP Site 698; ODP Site 700; ODP Site 738; ODP Site 761; ODP Site 762; Ocean Drilling Program; Ornamentation; Paratypes; Phylogeny; Planktonic taxa; Protista; Ruboglobigerinidae; Rugotruncana circumnodifer; SEM data; South Atlantic; Southern Ocean; Taxonomy; Upper Cretaceous; Weddell Sea; Whangara New Zealand
Coordinates: S643101 S643100 E0030600 E0030559
S650938 S650937 E0011218 E0011218
S513200 S512730 W0301641 W0330558
S624233 S624232 E0824715 E0824714
S164414 S164413 E1153206 E1153206
S195315 S195314 E1121515 E1121514
S383400 S383400 E1781300 E1781300
Record ID: 2007037439
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Abstract, Copyright, Cushman Foundation for Foraminiferal Research, Reference includes data from GeoScienceWorld, Alexandria, VA, United States