radiolaria - rads_cenozoic - Acrosphaera spinosa echinoides radiolaria - rads_cenozoic - Acrosphaera spinosa echinoides

Acrosphaera spinosa echinoides


Classification: rads_cenozoic -> Collosphaeridae -> Acrosphaera -> Acrosphaera spinosa -> Acrosphaera spinosa echinoides
Sister taxa: A. spinosa echinoides, A. spinosa fasciculopora, A. spinosa hamospina

Taxonomy

Citation: Acrosphaera spinosa echinoides (Haeckel) Bjoerklund&Goll 1979
taxonomic rank: sub-species
Synonyms:
1887 Acrosphaera echinoides - Haeckel p. 100, pl. 8, fig. 1
1887 ?Conosphaera plagioconus - Haeckel p. 222, pl. 12, fig. 4
1887 Acrosphaera spinosa echinoides - Haeckel pl. 1, figs. 7, 10-13; pl. 4, figs. 1-4, 7, 8
1971 Polysolenai sp. - Riedel & Sanfilippo pl. 1B, 5, 10, 12; pl. 2A, figs. 11, 13
1979 Acrosphaera spinosa echinoides - Bjørklund and Goll pp. 1311-1312, pl. 1, figs. 12-13 only; pl. 4, figs. 1-4, 7, and 8
1992 Acrosphaera spinosa echinoides - Lazarus pl. 5, figs. 5-8

Catalog entries:

Description


Published descriptions


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.


Biogeography and Palaeobiology

Biostratigraphic distribution

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:

References:

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. gs


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Acrosphaera spinosa echinoides compiled by the radiolaria@mikrotax project team viewed: 27-5-2024

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