Morphological Insights from Extremely Well-Preserved Parafollicucullus (Radiolaria, Order Albaillellaria) from a Probable Roadian (Guadalupian, Middle Permian) Manganese Nodule in the Nishiki Group of the Akiyoshi Belt, Southwest Japan

Nakagawa, T.; Wakita, Koji

doi:10.2517/2020pr001

Cited by 6 publications

(4 citation statements)

References 26 publications

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“…4). Noble et al (2017: p. 427) gave their reasons as “the type species falls well within the original diagnosis,” but this decision is rejected, because the flap develops on anatomically opposite sides in both genera (Nakagawa and Wakita 2020).…”

Section: Discussionmentioning

confidence: 99%

“…A further differing opinion concerns Cariver : in “The Paleozoic Radiolarian Genera Catalogue,” it is synonymized with Follicucullus based on the assumption that differences in the size of the ventral lingula indicate intrageneric variation. However, Nakagawa and Wakita (2020) noted that the developmental location of the ventral lingula is on anatomically opposite sides in both genera. Therefore, it is impossible to explain the differences as intrageneric variation without flipping the anatomical left and right, and thus Cariver is identified as a valid genus.…”

Section: Introductionmentioning

confidence: 99%

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Verifiability of genus-level classification under quantification and parsimony theories: a case study of follicucullid radiolarians

Xiao¹,

Suzuki²,

He³

et al. 2020

Paleobiology

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The classical taxonomy of fossil invertebrates is based on subjective judgments of morphology, which can cause confusion, because there are no codified standards for the classification of genera. Here, we explore the validity of the genus taxonomy of 75 species and morphospecies of the Follicucullidae, a late Paleozoic family of radiolarians, using a new method, Hayashi's quantification theory II (HQT-II), a general multivariate statistical method for categorical datasets relevant to discriminant analysis. We identify a scheme of 10 genera rather than the currently accepted 3 genera (Follicucullus, Ishigaconus, and Parafollicucullus). As HQT-II cannot incorporate stratigraphic data, a phylogenetic tree of Follicucullidae was reconstructed for 38 species using maximum parsimony. Six lineages emerged, roughly in concordance with the results of HQT-II. Combined with parsimony ancestral state reconstruction, the ancestral group of this family is Haplodiacanthus. Five other groups were discriminated, the Parafollicucullus, Curvalbaillella, Pseudoalbaillella, Longtanella, and Follicucullus–Cariver lineages. The morphological evolution of these lineages comprises a minimum essential list of eight states of four traits. HQT-II is a novel discriminant analytical multivariate method that may be of value in other taxonomic problems of paleobiology.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Verifiability of genus-level classification under quantification and parsimony theories: a case study of follicucullid radiolarians

Xiao¹,

Suzuki²,

He³

et al. 2020

Paleobiology

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“…Their utility in biostratigraphy means that almost all albaillellarian morphotypes from the late Palaeozoic worldwide have been illustrated and described. Because members of the Permian Albaillellaria are also reported worldwide (South China 2 ; Japan 3 ; Thailand 4 ; North American midcontinent 5 ), biostratigraphic correlations in the uppermost Carboniferous and Permian can be conducted with high resolution across South China, Japan and Thailand, that roughly correspond to the fusulinacean Provinces B (Eastern Tethyan Province) and C (Panthalassan Province) 6 established by Kobayashi 7 .…”

Section: Introductionmentioning

confidence: 99%

“…The Paleozoic Genera Working Group (PGW Group hereafter) decided to divide three genera, namely Parafollicucullus , Follicucullus and Ishigaconus , into 70 species 9 , 10 . Soon after this consensus was published, this three-genera scheme was undermined by data from the North America midcontinent 5 , China 11 and Japan 3 . Xiao et al 12 re-evaluated the generic taxonomy of Follicucullidae and discussed their phylogenetic relationships using mathematical methods, such as Hayashi’s quantification theory II and parsimony theories.…”

Section: Introductionmentioning

confidence: 99%

New Permian radiolarians from east Asia and the quantitative reconstruction of their evolutionary and ecological significances

Xiao

Suzuki

Ito

et al. 2021

Sci Rep

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The biostratigraphically important Permian radiolarian genera Pseudoalbaillella sensu stricto and Follicucullus (Follicucullidae, Polycystinea) are discriminated by morphological gaps in their wings and segmentation. Previous statistical analyses demonstrated that Longtanella fills morphological gaps between these two genera. Longtanella has long been regarded as a junior synonym of Parafollicucullus, and only a few species have been described. Herein several true Longtanella species are recognized from South China, and eight new species and five indeterminate species are described and illustrated to prove the validity of the genus Longtanella. In addition, a new genus, Parafollicucullinoides gen. nov., is described. Their palaeogeographic distributions and living environments are explored by applying correspondence analysis (CA), with occurrence datasets of selected fusulinacean genera from the Japanese Islands, China and Sundaland. CA results indicate that Longtanella was present to a limited extent in warmer conditions in the fusulinacean Province B and C during Kungurian–Roadian time, and possibly lived above the thermocline and below the deepest limit of fusulinaceans. The Pseudoalbaillella and the Follicucullus group preferred open ocean conditions, living below the thermocline and distributed not only in the ‘Equatorial Warm Water Province’, but also the northern peri-Gondwana Cool Water Province and the southern North Cool Water Province.

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Permian and Triassic radiolarians from chert breccia in the Nong Prue area, western Thailand: its origin and depositional setting in the Paleotethys

et al. 2022

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Morphological Insights from Extremely Well-Preserved Parafollicucullus (Radiolaria, Order Albaillellaria) from a Probable Roadian (Guadalupian, Middle Permian) Manganese Nodule in the Nishiki Group of the Akiyoshi Belt, Southwest Japan

Cited by 6 publications

References 26 publications

Verifiability of genus-level classification under quantification and parsimony theories: a case study of follicucullid radiolarians

Verifiability of genus-level classification under quantification and parsimony theories: a case study of follicucullid radiolarians

New Permian radiolarians from east Asia and the quantitative reconstruction of their evolutionary and ecological significances

Permian and Triassic radiolarians from chert breccia in the Nong Prue area, western Thailand: its origin and depositional setting in the Paleotethys

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