Portal de Periódicos da CAPES

New insights on the Paleogene dinoflagellate cyst genera Enneadocysta and Licracysta gen. nov. based on material from offshore eastern Canada and southern Argentina

2006; Micropaleontology Press; Volume: 52; Issue: 5 Linguagem: Inglês

10.2113/gsmicropal.52.5.385

1937-2795

R A Fensome, G. Raquel Guerstein, G. L. Williams,

Marine and coastal ecosystems

Research Article| December 01, 2006 New insights on the Paleogene dinoflagellate cyst genera Enneadocysta and Licracysta gen. nov. based on material from offshore eastern Canada and southern Argentina Robert A. Fensome; Robert A. Fensome 1Natural Resources Canada, Geological Survey of Canada (Atlantic), P.O. Box 1006, Dartmouth, Nova Scotia, Canada B2Y 4A2 Search for other works by this author on: GSW Google Scholar G. Raquel Guerstein; G. Raquel Guerstein 2Lab de Palinología, Depart. de Geología, Universidad Nacional del Sur, San Juan 670 8000, Bahía Blanca, Argentina email: rfensome@nrcan.gc.ca Search for other works by this author on: GSW Google Scholar Graham L. Williams Graham L. Williams 1Natural Resources Canada, Geological Survey of Canada (Atlantic), P.O. Box 1006, Dartmouth, Nova Scotia, Canada B2Y 4A2 Search for other works by this author on: GSW Google Scholar Author and Article Information Robert A. Fensome 1Natural Resources Canada, Geological Survey of Canada (Atlantic), P.O. Box 1006, Dartmouth, Nova Scotia, Canada B2Y 4A2 G. Raquel Guerstein 2Lab de Palinología, Depart. de Geología, Universidad Nacional del Sur, San Juan 670 8000, Bahía Blanca, Argentina email: rfensome@nrcan.gc.ca Graham L. Williams 1Natural Resources Canada, Geological Survey of Canada (Atlantic), P.O. Box 1006, Dartmouth, Nova Scotia, Canada B2Y 4A2 Publisher: Micropaleontology Press Received: 06 Jan 2006 Accepted: 02 Dec 2006 First Online: 06 Mar 2017 Online ISSN: 0026-2803 Print ISSN: 1937-2795 © 2006 The Micropaleontology Project, Inc. Micropaleontology (2006) 52 (5): 385–410. https://doi.org/10.2113/gsmicropal.52.5.385 Article history Received: 06 Jan 2006 Accepted: 02 Dec 2006 First Online: 06 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Search Site Citation Robert A. Fensome, G. Raquel Guerstein, Graham L. Williams; New insights on the Paleogene dinoflagellate cyst genera Enneadocysta and Licracysta gen. nov. based on material from offshore eastern Canada and southern Argentina. Micropaleontology 2006;; 52 (5): 385–410. doi: https://doi.org/10.2113/gsmicropal.52.5.385 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyMicropaleontology Search Advanced Search Abstract Enneadocysta is a biostratigraphically important Paleogene dinoflagellate cyst genus. Its original interpretation as a partiform gonyaulacoid (thus belonging to the gonyaulacalean suborder Cladopyxiineae) was based on the presence of two antapical processes. Another Paleogene genus, Areosphaeridium, is similar, at least superficially, to Enneadocysta, but has a single antapical process, placing it in the sexiform gonyaulacalean suborder Gonyaulacineae. The morphology of a new species of Enneadocysta from offshore eastern Canada, Enneadocysta magna, shows that the two antapical processes of the genus (unlike processes reflecting other plate series) are penitabular, not mesotabular, and indicates that the genus is gonyaulacinean, not cladopyxiinean. This new interpretation, as well as new material from southern Argentina, confirms the generic assignment of the Southern Hemisphere species Enneadocysta dictyostila (emended) and a new species, Enneadocysta brevistila. A new genus and species, Licracysta corymbus, from offshore eastern Canada is intermediate in morphology between Enneadocysta and Cleistosphaeridium and strongly suggests an assignment for all three genera to the gonyaulacinean family Areoligeraceae. The new combination Licracysta? semicirculata is questionably proposed, and the descriptive terms licrate, dolabrate, entire clypeate, ragged clypeate, intratabular, mesotabular, obtabular, contabular and nontabular are either proposed as new or reviewed. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.