Cambrian Radiolaria from the Georgina Basin, Queensland, Australia

Won, Mun-Zu; Below, Raimond

doi:10.2307/1486119

Cited by 79 publications

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“…9, fig. 10 in Won andBelow [1999]). This group diversified during the Ordovician and probably gave rise to the Secuicollactidae and Pseudorotasphaeridae.…”

Section: Palaeozoic Biodiversitymentioning

confidence: 99%

“…The oldest microfossils that can be considered as genuine radiolarians were recently described by Won and Below [1999] from the Middle Cambrian of Queensland, Australia. These radiolarians, which are very well preserved and diverse, consist of one or more point-centred spicules quite similar in structure and morphology to siliceous sponge spicules.…”

Section: Origin Of Complex Skeleton Forms In Radiolariamentioning

confidence: 99%

“…Palaeozoic radiolarians are abundant in sedimentary rocks that can be compared to shelf sediments [Dong et al, 1997 ;Won and Below, 1999]. Their skeletons are the principal component of the siliceous rocks from many Palaeozoic formations.…”

Section: Palaeozoic Biodiversitymentioning

confidence: 99%

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Diversity of radiolarian families through time

Wever

O’Dogherty

Caridroit

et al. 2003

Bulletin De La Société Géologique De France

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Abstract. -The examination of radiolarian biodiversity at the family level through Phanerozoic time reveals some general trends known in other groups of organisms, especially among plankton, while some other trends seem to be quite peculiar. The Permian /Triassic crisis that is one of the most important in the evolution of marine organisms, is marked in radiolarian assemblages by the extinction of two orders (Albaillellaria and Latentifistularia) towards the end of the Permian, and mostly by the tremendous diversification of Spumellaria and Nassellaria in the early-mid Triassic. Radiolarian diversity increased from Cambrian to Jurassic, remained quite stable during the Cretaceous and has decreased slightly since then. Diversité des familles de radiolaires au cours du tempsMots clés. -Radiolaires, Famille, Diversité, Paléozoïque, Mésozoïque, Cénozoïque, Extinction, Radiation, Protoctistes.Résumé. -L'examen de la biodiversité des radiolaires, au niveau de la famille au cours du Phanérozoïque révèle quelques tendances générales connues chez d'autres groupes d'organismes, surtout dans le plancton, alors que d'autres tendances leur sont particulières. La crise permo-triasique, l'une des plus importantes dans l'évolution des organismes marins, est marquée chez les radiolaires par l'extinction de deux familles (Albaillellaria et Latentifistularia) vers la fin du Permien, mais surtout par une énorme diversification des spumellaires et nassellaires au Trias inférieur et moyen. La diversité des radiolaires s'accroît du Cambrien au Jurassique, reste relativement stable au Crétacé et décroît légèrement depuis.

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“…9, fig. 10 in Won andBelow [1999]). This group diversified during the Ordovician and probably gave rise to the Secuicollactidae and Pseudorotasphaeridae.…”

Section: Palaeozoic Biodiversitymentioning

confidence: 99%

Section: Origin Of Complex Skeleton Forms In Radiolariamentioning

confidence: 99%

See 1 more Smart Citation

Diversity of radiolarian families through time

Wever

O’Dogherty

Caridroit

et al. 2003

Bulletin De La Société Géologique De France

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“…Nodules or concretions composed of phosphorous, calcareous or manganese carbonate matter are Lagerstätte for siliceous and organic microfossils. Fossiliferous nodules are present as far back as the middle Cambrian (e.g., Won and Below 1999 ). Amber is also known as Lagerstätte, which confi nes arthropods and plant fragments on land and preserves marine protists in some exceptional cases (Girard et al 2008 ).…”

Section: Geologic Record Types Of Marine Protistsmentioning

confidence: 99%

Oldest Fossil Records of Marine Protists and the Geologic History Toward the Establishment of the Modern-Type Marine Protist World

Suzuki

Oba

2015

Marine Protists

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The oldest marine protist fossil goes back 1.8 Ga (Statherian, Paleoproterozoic), and the oldest dinosterane biomarkers 1.6 Ga (Calymmian, Mesoproterozoic). The probable heterotrophic agglutinated microfossil appeared when marine metazoans appeared in the Ediacaran. Multichambered foraminifers appeared around the start of biomineralization in Small Shelly Fossils in the early Cambrian. The fi rst fossilizable radiolarian polycystine is likely to have appeared in the period of the Cambrian Explosion. After the initial appearance period, the emergence of fossilizable skeleton formative ability was concentrated in fi ve short geological time intervals: (1) the Middle to Late Devonian for calcareous benthic foraminifers; (2) the Carnian to the Rhaetian (Triassic) for the "switching on" of fossilizable dinofl agellate cysts, nannoliths, coccoliths and calcareous cysts, and probably the molecular appearance of diatoms; (3) the Toarcian-Aalenian Ages for diversifi ed dinofl agellates and coccolithophores, the establishment of symbiosis in radiolarian Acantharia and the appearance of planktic lifestyle in foraminifers; (4) the Albian-Maastrichtian Ages for the rapid accumulation of coccolithophores, the start of skeletogenesis both in silicofl agellates and marine centric diatoms, molecular appearance of both araphid and raphid diatoms, and the appearance of fossilizable araphid diatoms; and (5) the middle to late Eocene for the appearance of fossilizable raphid diatoms and radiolarian colonial collodarians and the continuous occurrences of ebridians. The establishment of the modern-type marine protist world was concluded in the late Eocene by the appearance of collodarians, the continuous occurrences of ebridians, and the substituted silicon precipitation marine protists as diatoms.

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“…We therefore focus hereafter on radiolarians, undoubtedly the dominant plankton fossils in the Paleozoic and Triassic oceans. They first occurred in the Cambrian (Won & Below 1999) and became morphologically complex through time (like Foraminifera) with the number of species increasing significantly in the Ordovician and Devonian.…”

Section: For Various Groups: Real Extinctions or Incompleteness Of Thmentioning

confidence: 99%

The plankton turnover at the Permo-Triassic boundary, emphasis on radiolarians

Wever

O’Dogherty

Goričan³

2006

Eclogae geol. Helv.

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The examination of plankton biodiversity through Permian-Triassic period seems to display different patterns of evolution depending of the scale of study (taxonomy stratigraphy or biogeography). In this paper we present the state of the art of the plankton turnover at the Permo-Triassic and we review more precisely the pattern of extinction and recovery of radiolarians during such period, because at that time, plankton was essentially represented by radiolarians. At a global scale the end-Permian to early Triassic period is marked by several strong extinctions in the marine realm, and in the radiolarians they occur progressively as exemplified by two orders of radiolarians: Albaillelaria and Latentifistularia. Nevertheless, this period is marked by a tremendous post-crisis diversification in both at family and generic level, more than extinction; an actualized revision of the diversity at the family level is also offered in our review. At a moderate scale (i.e. genera and in a region) the modifications appear impressive while at specific and regional domain the message is not so clear, one can wonder if some crisis manifestation results from a taxonomic accident or from preservative conditions. In fact, strangely enough more the number of studies is, more the diversity is high, and oppositely less they are, more the provincialism is evoked. RESUME L'examen de la biodiversité du plancton au passage Permien-Trias semble montrer différents types de manifestation selon l'échelle d'observation aussi bien en terme de stratigraphie que de taxonomie ou de géographie. A cette époque, le plancton était surtout représenté par les radiolaires. A une échelle globale cette période est certes marquée par des extinctions mais elles sont progressives comme le prouvent les deux ordres de radiolaires: les Albaillelaria et des Latentifistularia. Néanmoins cette période est surtout marquée par une énorme diversification post-crise, plus encore que par l'extinction. A une échelle moyenne (ex. niveau générique et celui d'un pays) les renouvellements de faune semblent impressionnants, alors qu'à l'échelle des espèces et de bassins particuliers, on est conduit à se demander si des modifications résultent de réelles crises biologiques ou de problèmes de conservation. Il est amusant de constater que plus le nombre d'études est élevé, plus la diversité apparaît grande et à l'opposé, plus elles sont rares, plus le provincialisme est évoqué. sic crisis within the sedimentary successions containing wellpreserved fossils indicate that during the Early Mesozoic a genuine radiation of microplankton took place, one that included heterotrophic as well as photoautotrophic protists. Undoubtedly, the radiolarians are the most important and dominant group among the microplankton after the Permo-Triassic crisis. This is the reason why we analyse in this paper the changes that occurred in this group.

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Cambrian Radiolaria from the Georgina Basin, Queensland, Australia

Cited by 79 publications

References 0 publications

Diversity of radiolarian families through time

Diversity of radiolarian families through time

Oldest Fossil Records of Marine Protists and the Geologic History Toward the Establishment of the Modern-Type Marine Protist World

The plankton turnover at the Permo-Triassic boundary, emphasis on radiolarians

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