arrayname: original
Catalog entries:
Bjørklund 1979 - Acrosphaera echinoides (p.1311): Lattice shell thick-walled, approximately spherical, 118-200µm in maximum diameter, slightly convolute with numerous small protuberances and alternating depressions. Protuberances 15-20µm in diameter; densely perforated by large, irregular, subangular pores 8-22µm in diameter. Simple spines 10-90µm long project from summit of each protuberance. Intervening depressions of lattice shell broad, sparsely perforated by small round pores 3-10µm in diameter. Remarks: Our detailed observations of this species have been confined to the Lower and Middle Miocene recovery of Site 55, 63 and 77. Acrosphaera spinosa echinoides undergoes a pronounced size dercrease in the Upper Miocene at Site 77, and persists in variable frequencies to the Lower Pliocene. The transition from A. s. echinoides to A. s. spinosa is complex and will require additional study.
Published descriptions
Geological Range:
Last occurrence (top): within Neogene Period (2.59-23.03Ma, top in Piacenzian stage). Data source: Lazarus et al. 2015 - "N age group"
First occurrence (base): within Neogene Period (2.59-23.03Ma, base in Aquitanian stage). Data source: Lazarus et al. 2015 - "N age group"
Plot of occurrence data:
Bjørklund, K. R. & Goll, M. R. (1979). Internal skeletal structures of Collosphaera and Trisolenia: A case of repetitive evolution in Collosphaeridae (Radiolaria). Journal of Paleontology. 53(6): 1239-1326. gs Haeckel, E (1887). Report on the Radiolaria collected by H.M.S. Challenger during the years 1873-1876. Report on the Scientific Results of the Voyage of H.M.S. Challenger during the years 1873-1876. 18: 1-1803. gs O Riedel, W. R. & Sanfilippo, A. (1971). Cenozoic Radiolaria from the western tropical Pacific, Leg 7. Initial Reports of the Deep Sea Drilling Project. 7: 1529-1666. gsReferences:
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Acrosphaera spinosa echinoides compiled by the radiolaria@mikrotax project team viewed: 25-3-2025
Short stable page link: https://mikrotax.org/radiolaria/index.php?id=203003 Go to Archive.is to create a permanent copy of this page - citation notes |
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