New insights into skeletal morphology of the oldest known silicoflagellates; Variramus, Cornua and Gleserocha gen. nov.

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doi: 10.1016/j.revmic.2014.05.001
Author(s): McCartney, Kevin; Witkowski, Jakub; Harwood, David M.
Author Affiliation(s): Primary:
University of Maine at Presque Isle, Department of Environmental Studies, Presque Isle, ME, United States
Other:
University of Szczecin, Poland
University of Nebraska at Lincoln, United States
Volume Title: Revue de Micropaléontologie
Source: Revue de Micropaléontologie, 57(2), p.75-91. Publisher: Elsevier, Paris, France. ISSN: 0035-1598 CODEN: RMCPAM
Note: In English with French summary. 33 refs.; illus., incl. 6 plates, sketch map
Summary: Two of the oldest known silicoflagellate-bearing sediments, lower Albian at Ocean Drilling Program Site 693 in the Weddell Sea of Antarctica and Santonian in the Devon Island sequence of the Canadian Archipelago, are re-examined with a focus on silicoflagellate genera Variramus, Cornua, and Gleserocha that lack basal rings, a feature appearing during late Santonian/early Campanian time within the genus Corbisema. The extraordinary variability of Variramus aculeifera is studied, and a new genus Gleserocha is proposed for taxa with apical structures made of three struts, but without pikes. This new genus includes previously described Variramus wisei and Cornua tapiae and new species G. harrisonii, and is here proposed as a genus transitional between Variramus and Cornua. Two unusual new species of Cornua, C. deflandrei and C. witkowskiana, are also described and a revised terminology is proposed for the skeletal components of Cornua and closely related genera. Abstract Copyright (2014) Elsevier, B.V.
Year of Publication: 2014
Research Program: ODP Ocean Drilling Program
Key Words: 10 Paleontology, Invertebrate; Albian; Arctic Archipelago; Canada; Cornua; Cretaceous; Devon Island; Dictyochaceae; Electron microscopy data; Gleserocha harrisonii; Invertebrata; Kanguk Formation; Leg 113; Lower Albian; Lower Cretaceous; Mesozoic; Microfossils; Morphology; New taxa; Nunavut; ODP Site 693; Ocean Drilling Program; Ochrophyta; Protista; Queen Elizabeth Islands; SEM data; Santonian; Silicoflagellata; Southern Ocean; Taxonomy; Upper Cretaceous; Variramus; Weddell Sea
Coordinates: S704954 S704953 W0143424 W0143425
Record ID: 2015011140
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands