Some new species of<i>Corrudinium</i>Stover &amp; Evitt 1978 (Dinophyceae) from the Eocene of New Zealand

Clowes, Christopher D.; Wilson, Graeme J.

doi:10.1080/00288306.2006.9515176

Cited by 5 publications

(9 citation statements)

References 5 publications

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“…The Eocene endemic dinocysts in the Southern Ocean were originally referred to as the “transantarctic flora,” a name derived from their presumed affinity to the inferred Trans‐Antarctic Seaway [ Wrenn and Beckman , 1982]. Later studies reported elements of the transantarctic flora from other Southern Ocean sectors [ Wrenn and Hart , 1988; Mao and Mohr , 1995; Levy and Harwood , 2000; Brinkhuis et al , 2003; Macphail and Truswell , 2004; Clowes and Wilson , 2006; Sluijs et al , 2009]. Some of these reports also described new species, but did not place those within the transantarctic flora.…”

Section: Methodsmentioning

confidence: 99%

Environmental forcings of Paleogene Southern Ocean dinoflagellate biogeography

et al. 2011

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[1] Despite warm polar climates and low meridional temperature gradients, a number of different high-latitude plankton assemblages were, to varying extents, dominated by endemic species during most of the Paleogene. To better understand the evolution of Paleogene plankton endemism in the high southern latitudes, we investigate the spatiotemporal distribution of the fossil remains of dinoflagellates, i.e., organic-walled cysts (dinocysts), and their response to changes in regional sea surface temperature (SST). We show that Paleocene and early Eocene (∼65-50 Ma) Southern Ocean dinocyst assemblages were largely cosmopolitan in nature but that a distinct switch from cosmopolitan-dominated to endemic-dominated assemblages (the so-called "transantarctic flora") occurred around the early-middle Eocene boundary (∼50 Ma). The spatial distribution and relative abundance patterns of this transantarctic flora correspond well with surface water circulation patterns as reconstructed through general circulation model experiments throughout the Eocene. We quantitatively compare dinocyst assemblages with previously published TEX 86 -based SST reconstructions through the early and middle Eocene from a key locality in the southwest Pacific Ocean, ODP Leg 189 Site 1172 on the East Tasman Plateau. We conclude that the middle Eocene onset of the proliferation of the transantarctic flora is not linearly correlated with regional SST records and that only after the transantarctic flora became fully established later in the middle Eocene, possibly triggered by large-scale changes in surface-ocean nutrient availability, were abundances of endemic dinocysts modulated by regional SST variations.

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Section: Methodsmentioning

confidence: 99%

Environmental forcings of Paleogene Southern Ocean dinoflagellate biogeography

et al. 2011

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“…Dinocyst taxonomy follows that cited by Fensome and Williams (2004), Fensome et al (2007Fensome et al ( , 2008, Clowes and Wilson (2006), Pross et al (2010).…”

Section: Abundance Preservation and Taxonomymentioning

confidence: 99%

Methods

2011

Proceedings of the IODP

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Information assembled in this chapter will help the reader understand the basis for our shipboard observations and preliminary conclusions. It will also enable the interested investigator to identify data and select samples for further analysis. Information presented here concerns only shipboard operations and analyses described in the site chapters. Methods used by various investigators for shore-based analyses of Expedition 318 data will be described in individual publications in various professional journals. This introductory section provides an overview of operations, curatorial conventions, and general core handling and analysis. Site locationsAt all Expedition 318 sites, Global Positioning System (GPS) coordinates from precruise site surveys were used to position the vessel on site. The only seismic system used during the cruise was the Syquest Bathy 2010 CHIRP subbottom profiler, which was monitored on the approach to each site to reconfirm the seafloor depths with those from the precruise survey. Once the vessel was positioned at a site, the thrusters were lowered and a positioning beacon was dropped to the seafloor. The dynamic positioning control of the vessel uses navigational input from the GPS and triangulation to the seafloor beacon, weighted by the estimated positional accuracy (Fig. F1). The final hole position was the mean position calculated from the GPS data collected over the time that the hole was occupied.

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“…Previous accounts of Paleogene dinoflagellate cysts from mainland and near-shore New Zealand include Deflandre 1933, Couper 1960, Wilson 1967c, 1982aand 1982c, Clowes & Morgans 1984, Wilson 1985, Clowes 1985, Wilson 1988, Beggs et al 1992, Strong et al 1995, Edbrooke et al 1998, Crouch 2001, Willumsen 2003, Morgans et al 2004, Willumsen 2004, Hollis et al 2005and Clowes & Wilson 2006. The majority of the publications describe material from localities in eastern New Zealand ranging from Hawkes Bay to Otago, although Beggs et al 1992 deals exclusively with material from petroleum exploration wells in the offshore Taranaki Basin west of North Island.…”

Section: Previous Workmentioning

confidence: 99%

“…Acritarchs encountered in the study are described, also, and the phenetic taxonomy of the Acritarcha provides an interesting contrast to the present 'mixed' state of dinoflagellate taxonomy: phylogenetic above the genus rank, and arguably below it, but predominantly phenetic at the genus rank.Extensive single mount collections were harvested from a number of samples which were found to be especially rich, well preserved, or which contained new taxa. The outcome has included descriptions of 25 new species, in addition to two (Corrudinium regulare and Corrudinium otagoense) published in an earlier paper (Clowes & Wilson 2006…”

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Dinoflagellate Taxonomy and Biostratigraphy of the Mid- to Late Eocene and Early Oligocene of New Zealand

Clowes¹

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<p>This document presents results from a study of the Mid- to Late Eocene and earliest Oligocene marine palynomorphs from on-shore and near-shore New Zealand. Eighty samples of appropriate age from across mainland New Zealand were examined for fossil dinoflagellates. Acritarchs encountered in the study are described, also, and the phenetic taxonomy of the Acritarcha provides an interesting contrast to the present 'mixed' state of dinoflagellate taxonomy: phylogenetic above the genus rank, and arguably below it, but predominantly phenetic at the genus rank. Extensive single mount collections were harvested from a number of samples which were found to be especially rich, well preserved, or which contained new taxa. The outcome has included descriptions of 25 new species, in addition to two (Corrudinium regulare and Corrudinium otagoense) published in an earlier paper (Clowes & Wilson 2006), namely: Achilleodinium echinatum, Achilleodinium improcerum, ?Areoligera hampdenensis, Batiacasphaera perforata, Chlamydophorella neopilata, Chlamydophorella pilata, Corrudinium bujakii, Deflandrea totara, Disphaerogena morgansii, Graptodinium inconditum, Graptodinium reticulatum, Nummus inornatus, Operculodinium crouchii, Operculodinium schioleri, Operculodinium pulcher, Operculodinium vulgare, Phthanoperidinium aculeatum, Phthanoperidinium australe, Phthanoperidinium dentatum, Phthanoperidinium granulatum, Phthanoperidinium spumosum, Phthanoperidinium tenuimurum, Pyxidinopsis mundus, Pyxidinopsis teuriensis, Samlandia tenuis. Although there remain some difficulties where the adopted suprageneric phylogeny meets the traditionally phenetic generic constructs, adopting an explicitly phylogenetic approach to dinoflagellate taxonomy was found to be a fruitful approach. Investigation into some of the new taxa described herein was first prompted by geographic or temporal occurrence criteria which hinted that relationships might be other than those immediately suggested by gross morphology. Only upon closer inspection were subtler morphological distinctions noticed. To adopt a wholly phylogenetic approach almost certainly requires the abandonment of taxa, particularly genera, which are uniquely defined by mutually exclusive morphological criteria. Other clues to phylogeny, such as stratigraphic and regional occurrence data, may also have to be recognised. Notwithstanding, all taxa described herein are, in fact, defined by means of conventional morphological distinctions. This study does not take the bold step to suggest a new taxon based wholly on geographical and temporal criteria. Doing so, however, is clearly a rational extension to the ideas presented herein, and is thought worthy of further investigation. A subordinate goal of this study was to further refine the younger part of Wilson's dinoflagellate biozonation for New Zealand (Wilson 1984d, 1987, 1988; Morgans et al. 2004), to: improve resolution, if possible; clarify an ambiguous boundary remaining in the literature, between the Wetzeliella hampdenensis and Wilsonidium tabulatum zones; incorporate more common taxa, which are not restricted to particular ecological settings. This has been progressed by a number of measures, including adopting a consistent approach to defining zone boundaries; replacement of the Wilsonidium echinosuturatum and Wilsonidium lineidentatum Zones with three new zones, Deflandrea convexa (early Porangan - late Porangan), Graptodinium inconditum (late Porangan - early Bortonian), and Impagidinium elegans (early Bortonian - late Bortonian); and the establishment of an additional new zone, the Stoveracysta kakanuiensis Zone, straddling the Eocene-Oligocene boundary.</p>

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Some new species ofCorrudiniumStover & Evitt 1978 (Dinophyceae) from the Eocene of New Zealand

Cited by 5 publications

References 5 publications

Environmental forcings of Paleogene Southern Ocean dinoflagellate biogeography

Environmental forcings of Paleogene Southern Ocean dinoflagellate biogeography

Methods

Dinoflagellate Taxonomy and Biostratigraphy of the Mid- to Late Eocene and Early Oligocene of New Zealand

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