Abstract
AbstractA 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
Funder
Australian Research Council
Publisher
Cambridge University Press (CUP)
Reference83 articles.
1. Study of Late Ordovician radiolarians from the Lachlan Fold Belt, southeastern Australia;Goto;Geology Research Report, Shimane University,1991
2. Katian (Ordovician) radiolarians from the Malongulli Formation, New South Wales, Australia, a reexamination
3. Ordovician (Darriwilian–Katian) lingulate brachiopods from central New South Wales, Australia;Percival;Memoirs of the Association of Australasian Palaeontologists,2016
4. Upper Ordovician conodonts from the Malongulli Formation, Cliefden Caves area, central New South Wales;Trotter;AGSO Journal of Australian Geology and Geophysics,1994
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