ORCID Profile
0000-0001-9610-1284
Current Organisation
CSIRO
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Publisher: Cambridge University Press (CUP)
Date: 06-09-2022
DOI: 10.1017/JPA.2021.86
Abstract: A erse, well-preserved radiolarian assemblage is reported from the Sandbian age Climacograptus bicornis Graptolite Biozone. This new assemblage, recovered from the Pingliang Formation in the Guanzhuang section, China, includes six new species along with 13 other previously described taxa. Geminusphaera new genus incorporates G . grandis n. sp. and G . kongtongensis n. sp. and is proposed for inaniguttids constructed from two distinct porous spheres bearing seven or more primary spines. Protopylentonema new genus is introduced to incorporate pylomate entactinarians with five-rayed initial spicules. It includes P . ordosensis n. sp. as well as P . aperta , P . rimata , and P . insueta that were formerly assigned to Kalimnasphaera . Micro-computed tomography investigation of skeletal microstructure supports establishment of the new genera together with other new spumellarian species: Haplotaeniatum implexa n. sp., Inanigutta quadrispinosa n. sp., and Kalimnasphaera pingliangensis n. sp. It also indicates that family-level reassignment of Etymalbaillella from the Proventocitidae to the Ceratoikiscidae is appropriate. Global distribution of Late Ordovician radiolarian occurrences highlights a strong preference for areas with equatorial to tropical sea surface temperatures. This must have led to ecological stress among radiolarian communities in adapting to global cooling in the Hirnantian. UUID: d3f55b8-0e70-4f9f-9738-265750d8ec3a .
Publisher: Cambridge University Press (CUP)
Date: 05-04-2023
DOI: 10.1017/JPA.2023.13
Abstract: A erse 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 rimary 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: 64c026f-35af-4025-a4f7-de8f9a91f8b9
Publisher: University of Queensland Library
Date: 2022
DOI: 10.14264/F06F695
Publisher: Cambridge University Press (CUP)
Date: 29-04-2020
DOI: 10.1017/S001675682000028X
Abstract: A erse assemblage of moderately well-preserved radiolarians occurs in the Ordovician cherts of the Crawford Group in the Southern Uplands terrane of the Scottish borders. A total of 8 genera and 11 species are described. Taxa present correlate to the Middle Ordovician Pygodus anserinus biozone. Key species identified include: Proventocitum procerulum , Inanigutta gansuensis , Inanigutta sp. cf. I. complanata , Inanibigutta sp. cf. I. verrucula , Inanibigutta sp. cf. I. pinglianensis , ? Inanibigutta inconstans , ? Inanihella penrosei , Haplentactinia armillata , ? Oriundogutta ramificans and Syntagentactinia sp. A new species Haplotaeniatum albaensis is introduced here and described on the basis of details of skeletal architecture observed using microcomputed tomography, demonstrating the potential of this technique as a tool for improving the understanding of radiolarian taxonomy.
Location: Australia
No related grants have been discovered for Palihawadana Arachchige Siyumini Ruwanthi Dilinisha Perera.