New radiolarians from the Devonian of the southern Ural Mountains: 2. Middle-Late Devonian

Afanasieva, M. S.; Amon, E. O.

doi:10.1134/s0031030109010043

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…As Entactinia Foreman (1963) is a junior synonym of Stigmosphaerostylus Rüst, 1982 (Aitchison andStratford, 1997;Noble et al, 2017) and these forms have rod-like rather than three-bladed spines, Noble and Webby (2009) reassigned them within Borisella Afanasieva (2000) along with W. dunhilli, another species with an extra spongy outer layer. However, both these Katian species differ significantly from the Devonian (upper Frasnian) type specimen, Borisella maksimovae Afanasieva, 2000. In contrast to the rod-like primary spines of Wiradjuri, Borisella has primary spines with "Y-shaped" basal cross sections similar to other entactiniids with bladed spines and a relatively short median microbar (<8.5 μm). Ordovician radiolarians that have been assigned to Borisella are abundant in Upper Ordovician strata of Australia (Webby and Blom, 1986;Noble and Webby, 2009;herein), the United States (Renz, 1990), and Russia (Obut, 2022).…”

Section: Systematic Paleontologymentioning

confidence: 81%

“…dunhilli , another species with an extra spongy outer layer. However, both these Katian species differ significantly from the Devonian (upper Frasnian) type specimen, Borisella maksimovae Afanasieva, 2000. In contrast to the rod-like primary spines of Wiradjuri , Borisella has primary spines with “Y-shaped” basal cross sections similar to other entactiniids with bladed spines and a relatively short median microbar (<8.5 μm).…”

Section: Systematic Paleontologymentioning

confidence: 84%

“…subulate as Entactinia subulate , and this usage was followed by Renz (1990) and Noble (2000). As Entactinia Foreman (1963) is a junior synonym of Stigmosphaerostylus Rüst, 1982 (Aitchison and Stratford, 1997; Noble et al, 2017) and these forms have rod-like rather than three-bladed spines, Noble and Webby (2009) reassigned them within Borisella Afanasieva (2000) along with W . dunhilli , another species with an extra spongy outer layer.…”

Section: Systematic Paleontologymentioning

confidence: 99%

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Micro-CT analysis of Katian radiolarians from the Malongulli Formation, New South Wales, Australia, and implications for skeletogenesis

Perera

Aitchison

2023

J. Paleontol.

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A diverse and well-preserved radiolarian assemblage from the Malongulli Formation, New South Wales, Australia, contains 13 species representing 10 genera and six families. One new genus, Wiradjuri, is introduced to accommodate pre-Devonian single-shelled entactiniid taxa, and one new species, Secuicollacta malongulliensis, is recorded together with some previously described forms. The microstructures of the “rotasphaerid structure/primary unit” and the “ectopic spicule” are investigated to validate their roles as fundamental units in the Secuicollactidae, together with comprehensive documentation of the previously enigmatic Pseudorotasphaera internal skeleton. The results of this investigation suggest that, among all radiolarian genera that survived the Late Ordovician Mass Extinction event (LOME) and transitioned into the Silurian, Secuicollacta, Haplotaeniatum, and Palaeoephippium maintained stable body plans during the transition and were more successfully established. The selective advantages these lineages had during the LOME were most likely spontaneous outcomes of the mode of structural development involving sequential skeletogenesis and a tendency to evolve toward simpler body plans. UUID: http://zoobank.org/264c026f-35af-4025-a4f7-de8f9a91f8b9

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