<i>Actinocyclus nipponicus</i> sp. nov. and <i>A. bradburyii</i> sp. nov. (Bacillariophyta) from Miocene lacustrine sediments of the proto-Japan Sea

Hayashi, Tatsuya; Saito-Kato, Megumi; Tanimura, Yoshihiko

doi:10.2216/11-17.1

Cited by 7 publications

(6 citation statements)

References 10 publications

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“…nipponicus and A . bradburyii , described from the RC12-394 core as new species [ 37 ], are shown in Figs 3F , 4E, 4H , 5B, 5C and 5D . In all samples, two genera, Actinocyclus and Aulacoseira Thwaites, are the dominant planktonic centric diatoms ( Table 1 ), whereas Stephanodiscaceae genera are absent.…”

Section: Resultsmentioning

confidence: 99%

“…nipponicus Hayashi, Saito-Kato & Tanimura, A . bradburyii Hayashi, Saito-Kato & Tanimura [ 37 ], A . haradaae (Pantoscek) Saito-Kato [ 46 ], A .…”

Section: Discussionmentioning

confidence: 99%

“… Actinocyclus , Cyclostephanos , Stephanodiscus , Mesodictyon and cyclotelloid species. Data are collected from [ 13 , 37 , 43 , 94 , 97 ]. …”

Section: Discussionmentioning

confidence: 99%

“…We used three samples taken from the lower diatomite to take light microscope (LM) and scanning electron microscope (SEM) photographs of Actinocyclus nipponicus Hayashi, Saito-Kato & Tanimura and A . bradburyii Hayashi, Saito-Kato & Tanimura, which were recently described [ 37 ]. It is suggested the freshwater diatomite was very likely early Miocene in age for two reasons: close similarity in diatom assemblages between the freshwater diatomite in the RC12-394 core to those in several early Miocene freshwater diatomite formations in Japanese islands, and the difference in diatom assemblages between the diatomite and the latest Miocene sediments found in several piston cores taken very close to RC12-394 [ 38 , 39 ].…”

Section: Methodsmentioning

confidence: 99%

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The turnover of continental planktonic diatoms near the middle/late Miocene boundary and their Cenozoic evolution

et al. 2018

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Fossil evidence indicates that modern assemblages of temperate nonmarine planktonic diatoms began near the middle/late Miocene boundary when the genus Actinocyclus, an important constituent of lacustrine planktonic diatom assemblages during the early to middle Miocene, was replaced by genera of the family Stephanodiscaceae. This floral turnover has been confirmed in many regions of the world, except eastern Asia where taxonomic data about early and middle Miocene planktonic diatom assemblages have until recently been scarce. Our analysis of Lower and Middle Miocene lacustrine diatomaceous rocks in Japan confirms that species of nonmarine Actinocyclus were important constituents of lake phytoplankton there as well. The appearance of nonmarine Actinocyclus species near the beginning of the Miocene may have resulted from the introduction of euryhaline species into lacustrine environments during a highstand of sea level at that time. Similarly, it is possible that species of Stephanodiscaceae evolved from marine thalassiosiroid ancestors that invaded high latitude lacustrine environments during multiple Paleogene highstands, resulting in a polyphyletic origin of the family. The turnover from nonmarine Actinocyclus to Stephanodiscaceae genera near the middle/late Miocene boundary may be linked to a contemporaneous increase in silica concentrations in lakes caused by active volcanism, increased weathering of silicate rocks due to orogeny, and the expansion of C4 grasslands. This turnover may also have been influenced by enhanced seasonal environmental changes in the euphotic zone caused by the initiation of monsoon conditions and a worldwide increase in meridional temperature gradients during the late Miocene. Morphological characteristics of Stephanodiscaceae genera, such as strutted processes and small size, suggest their species were better adapted to seasonal environmental changes than nonmarine species of Actinocyclus because of their superiority in floating and drifting capabilities and possibly metabolism, intrinsic growth rate, and reproductivity. As climates deteriorated during the late Miocene, Stephanodiscaceae species may have spread from high latitudes to temperate lakes where they diversified, ultimately displacing Actinocyclus.

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Section: Resultsmentioning

confidence: 99%

“…nipponicus Hayashi, Saito-Kato & Tanimura, A . bradburyii Hayashi, Saito-Kato & Tanimura [ 37 ], A . haradaae (Pantoscek) Saito-Kato [ 46 ], A .…”

Section: Discussionmentioning

confidence: 99%

“… Actinocyclus , Cyclostephanos , Stephanodiscus , Mesodictyon and cyclotelloid species. Data are collected from [ 13 , 37 , 43 , 94 , 97 ]. …”

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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The turnover of continental planktonic diatoms near the middle/late Miocene boundary and their Cenozoic evolution

et al. 2018

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“…The freshwater diatom flora was also found in the Lower Miocene deposits from Yamato and Krishtofovich Rises in the Sea of Japan (Usoltseva & Tsoy 2010, Tsoy & Usol tseva 2015, Tsoy 2017. New fossil diatom species of Aulacoseira (Tanaka et al 2008, Tanaka & Nagumo 2011a, Actinocyclus (Tanaka & Nagumo 2014, Hayashi et al 2012 and Tetracyclus (SaitoKato et al 2011) from Miocene deposits of Japan and Sea of Japan were described.…”

Section: Freshwater Centric Diatoms From Middle Miocene Deposits Of the Khanka Depression Primorye Territory (Far East Of Russia)mentioning

confidence: 87%

Freshwater centric diatoms from Middle Miocene deposits of the Khanka Depression, Primorye Territory (Far East of Russia)

Likhacheva¹,

Avramenko²,

Usoltseva³

et al. 2021

Bot Pac

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The centric diatom flora from the Middle Miocene deposits of the Khanka Depression of Primorye (Far East of Russia) was in detail studied. The centric diatoms were presented by 10 species and intraspecies taxa belonging to four genera (Aulacoseira Thwaites, Alveolophora Moiseeva et Nevretdinova, Ellerbeckia Crawford, Melosira Agard) and three orders (Aulacoseirales, Paraliales and Melosirales). A detailed study with the use of LM and SEM allowed us to establish the high morphologic variability of the predominant representatives of the genus Aulacoseira. The diagnoses for the Alveolophora tscheremissinovae, Ellerbeckia kochii, Melosira undulata species were supplemented. The comparison of the taxonomic compositions of the centric diatoms from the Khanka complex with the even-aged complexes from other regions has shown the wide spreading of the genus Aulacoseira taxa in the freshwater bodies during this time period.

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A distinctive stellate species of the genusActinocyclus(Bacillariophyta) from Oligocene sediments in the central Pacific Ocean and its morphological significance

Williams

Zhang

et al. 2022

Phycologia

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Actinocyclus nipponicus sp. nov. and A. bradburyii sp. nov. (Bacillariophyta) from Miocene lacustrine sediments of the proto-Japan Sea

Cited by 7 publications

References 10 publications

The turnover of continental planktonic diatoms near the middle/late Miocene boundary and their Cenozoic evolution

The turnover of continental planktonic diatoms near the middle/late Miocene boundary and their Cenozoic evolution

Freshwater centric diatoms from Middle Miocene deposits of the Khanka Depression, Primorye Territory (Far East of Russia)

A distinctive stellate species of the genusActinocyclus(Bacillariophyta) from Oligocene sediments in the central Pacific Ocean and its morphological significance

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