Taxonomy and Evolution of Paleogene Antarctic and Tropical Lophocyrtid Radiolarians

Sanfilippo, Annika; Caulet, J.

doi:10.2307/1486083

Cited by 36 publications

(37 citation statements)

References 38 publications

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“…(up to ∼ 10 %). Lophocyrtis jacchia hapsis is considered to be a high-latitude variant of L. jacchia jacchia and has a short stratigraphic range in the middle to late Eocene in the Southern Ocean (Sanfilippo and Caulet, 1998). In our study this taxon has a common appearance only during the MECO and in the upper Eocene (Fig.…”

Section: Trends In Biogeographic Affinitiesmentioning

confidence: 63%

“…We focussed on published records of these taxa or their close relatives from the southwest Pacific and Southern Ocean (e.g. Petrushevskaya, 1975;Takemura and Ling, 1997;Sanfilippo and Caulet, 1998;Hollis, 2002Hollis, , 2006Nishi, 2005, 2008;Funakawa et al, 2006;Kamikuri et al, 2013). This literature review was complemented with radiolarian occurrence data from the NSB (Neptune Sandbox Berlin) database (Lazarus, 1994;Spencer-Cervato, 1999).…”

Section: Radiolarian Biogeographic Affinitiesmentioning

confidence: 99%

“…bicorne. Lophocyrtis jacchia hapsis, which is a high-latitude variant of L. jacchia jacchia (Sanfilippo and Caulet, 1998) A major change in siliceous assemblages occurs within the PrOM interval (∼ 226 mbsf; Core 277-25R), coincident with maximum values in benthic δ 18 O (Fig. 4).…”

Section: Radiolarian Assemblages At Dsdp Site 277mentioning

confidence: 99%

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Expansion and diversification of high-latitude radiolarian assemblages in the late Eocene linked to a cooling event in the Southwest Pacific

Pascher¹,

Hollis²,

Bohaty³

et al. 2015

Preprint

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Abstract. The Eocene was characterised by "greenhouse" climate conditions that were gradually terminated by a long-term cooling trend through the middle and late Eocene. This long-term trend was determined by several large-scale climate perturbations that culminated in a shift to "ice-house" climates at the Eocene–Oligocene Transition. Geochemical and micropaleontological proxies suggest that tropical-to-subtropical sea-surface temperatures persisted into the late Eocene in the high-latitude Southwest Pacific Ocean. Here, we present radiolarian microfossil assemblage and foraminiferal oxygen and carbon stable isotope data from Deep Sea Drilling Project (DSDP) Sites 277, 280, 281 and 283 from the middle Eocene to early Oligocene (~ 40–33 Ma) to identify oceanographic changes in the Southwest Pacific across this major transition in Earth's climate history. The Middle Eocene Climatic Optimum at ~ 40 Ma is characterised by a negative shift in foraminiferal oxygen isotope values and a radiolarian assemblage consisting of about 5 % of low latitude taxa Amphicraspedum prolixum group and Amphymenium murrayanum. In the early late Eocene at ~ 37 Ma, a positive oxygen isotope shift can be correlated to the Priabonian Oxygen Isotope Maximum (PrOM) event – a short-lived cooling event recognized throughout the Southern Ocean. Radiolarian abundance, diversity, and preservation increase during the middle of this event at Site 277 at the same time as diatoms. The PrOM and latest Eocene radiolarian assemblages are characterised by abundant high-latitude taxa. These high-latitude taxa also increase in abundance during the late Eocene and early Oligocene at DSDP Sites 280, 281 and 283 and are associated with very high diatom abundance. We therefore infer a~northward expansion of high-latitude radiolarian taxa onto the Campbell Plateau towards the end of the late Eocene. In the early Oligocene (~ 33 Ma) there is an overall decrease in radiolarian abundance and diversity at Site 277, and diatoms are absent. These data indicate that, once the Tasman Gateway was fully open in the early Oligocene, a frontal system similar to the present day was established, with nutrient-depleted subantarctic waters bathing the area around DSDP Site 277, resulting in a more oligotrophic siliceous plankton assemblage.

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Section: Trends In Biogeographic Affinitiesmentioning

confidence: 63%

Section: Radiolarian Biogeographic Affinitiesmentioning

confidence: 99%

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Expansion and diversification of high-latitude radiolarian assemblages in the late Eocene linked to a cooling event in the Southwest Pacific

Pascher¹,

Hollis²,

Bohaty³

et al. 2015

Preprint

View full text Add to dashboard Cite

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“…A.] Lophocyrtis (Apoplanius) aspera (Ehrenberg), Sanfilippo & Caulet 1998, p. 14, pl.3A, fig.5-10 fig.4a-7. [p.74, pl.8, fig. 17 as Lophocyrtis (Cyclampterium) hadra.]…”

Section: List Of Radiolaria From the Mahurangi Limestonementioning

confidence: 99%

Distribution and biostratigraphy of latest Eocene to latest Oligocene Radiolaria from the Mahurangi Limestone, Northland, New Zealand

O'Connor

1999

New Zealand Journal of Geology and Geophysics

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Radiolaria from the Mahurangi Limestone are generally common to abundant, well preserved, and the faunas reasonably diverse. However, all published information concerning these radiolarian faunas concentrates on the description of new species. This leaves useful data on location, density, abundance, preservation, biostratigraphy, and distribution unpublished.Data on 50 radiolarian-bearing samples from 30 localities spanning the geographical range of the Mahurangi Limestone are presented. Forty-three of these samples, from 25 localities, contain radiolarian age index taxa. More than 179 radiolarian taxa are identified, from over 89 genera, and diversity ranges up to 136 taxa per sample.Fifteen radiolarian index species can be identified within the Mahurangi Limestone, allowing many localities to be dated on radiolarian evidence alone. For age control, nannofossil age data from samples containing radiolarian age indicators are also presented. Radiolaria give an age range for the Mahurangi Limestone of latest Eocene to latest Oligocene.New or updated information includes a locality map, data on radiolarian densities, abundances and preservation for each sample, biostratigraphic information, a full list of radiolarian taxa identified from the Mahurangi Limestone, and tables of radiolarian distribution within the studied samples. A diagram correlating international and New Zealand stages with new information on South Pacific and tropical radiolarian zones for the latest Eocene to earliest Miocene is also provided, together with stratigraphic ranges for radiolarian index species used for dating the Mahurangi Limestone.

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“…Radiolarians from deep-sea sediments around Antarctica have been studied for over 50 years (Riedel, 1958). They are, together with diatoms, the only diverse, well-preserved microfossils in most Cenozoic deep-sea Antarctic sediments, and thus have been used in many palaeooceanographical, biostratigraphical and evolutionary studies (Hays, 1965;Chen, 1975;Hays et al, 1976;Lazarus, 1992;Sanfilippo & Caulet, 1998;Abelmann et al, 1999;Lazarus, 2002;Funakawa & Nishi, 2005). Taxonomic study of these faunas, however, has been limited and mostly carried out as a secondary adjunct to the applied work.…”

Section: Introductionmentioning

confidence: 99%

New species of Neogene radiolarians from the Southern Ocean – part II

Renaudie

Lazarus

2013

J. Micropalaeontol.

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Abstract. Antarctic Neogene radiolarians are well preserved and offer great potential for biostratigraphical, palaeooceanographical and evolutionary studies. Most of the species, however, have not yet been fully documented. In this paper, the second of a planned series, we describe 21 new species of Antarctic Neogene radiolarians: six spumellarians (Actinomma eldredgei, Actinomma cocles, Anomalacantha? jeapica, Lonchosphaera? suzukii, Pentactinosphaera codonia and Sethodiscus? pravus) and fifteen nassellarians (Antarctissa evanida, Botryopera chippewa, Botryopera? daleki, Clathrocorys? sugiyamai, Clathromitra lemi, Clathromitra? fulgureanubes, Enneaphormis? sp., Lamprocyrtis? datureacornis, Lophocyrtis pallantae, Lithomelissa? kozoi, Phormospyris loliguncula, Platybursa harpoi, Saccospyris victoria, Protoscenium pantarhei and Trisulcus halipleumon). Most of these species are fairly rare but some can be locally common, and most have restricted stratigraphical ranges within the Miocene or Early Pliocene.

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Taxonomy and Evolution of Paleogene Antarctic and Tropical Lophocyrtid Radiolarians

Cited by 36 publications

References 38 publications

Expansion and diversification of high-latitude radiolarian assemblages in the late Eocene linked to a cooling event in the Southwest Pacific

Expansion and diversification of high-latitude radiolarian assemblages in the late Eocene linked to a cooling event in the Southwest Pacific

Distribution and biostratigraphy of latest Eocene to latest Oligocene Radiolaria from the Mahurangi Limestone, Northland, New Zealand

New species of Neogene radiolarians from the Southern Ocean – part II

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