Taxonomy and evolution of Paleogene Antarctic and tropical Lophocyrtid radiolarians

Investigation of three-segmented theoperids through successive stratigraphic levels in antarctic Paleogene sediment sequences, and a tropical reference section, resulted in recognition of four groups characterized by different cephalic structures taxonomically treated as the new genera Aphetocyrtis...

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Bibliographic Details
Published in:Micropaleontology 1998, Vol.44 (1), p.1-43
Main Authors: Sanfilippo, Annika, Caulet, Jean-Pierre
Format: Article
Language:English
Subjects:
Abdomen
Antarctica
biogeography
biologic evolution
Biological taxonomies
Cenozoic
Drilling
Evolution
Invertebrata
invertebrate
Lophocyrtis
microfossils
Oceans
Paleogene
Paleogene period
Paleontology
Protista
Radiolaria
Seas
Sediments
Strictures
taxonomy
Tertiary
Thorax
tropical environment
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Summary:Investigation of three-segmented theoperids through successive stratigraphic levels in antarctic Paleogene sediment sequences, and a tropical reference section, resulted in recognition of four groups characterized by different cephalic structures taxonomically treated as the new genera Aphetocyrtis and Clinorhabdus, the new subgenus Lophocyrtis (Apoplanius), and the previously described subgenus Lophocyrtis (Lophocyrtis). All four lineages are represented in Middle Eocene sediments from the Antarctic. (Auth. mod.)
ISSN:0026-2803
1937-2795
DOI:10.2307/1486083