From Suzuki Paleotax db:
1979 Acrosphaera transformata Hilmers Bjørklund & Goll p. 1312, 1315, pl. 1, figs. 1-6
1987 Collosphaera transformata Hilmers [sic] Bjørklund & de Ruiter fig. 2.2
Catalog entries: Acrosphaera transformata
Published descriptions
Remarks.- Haeckel (1887, pl. 8, fig. 11) illustrated a small colony designated Xanthiosphaera lappacea. Lattice shells of this colony most closely resemble a specimen on the same plate (fig. 8) identified as Clathrosphaera lamellosa Haeckel, 1887. A third specimen on this plate (fig. 10) is identified as a solitary lattice shell of X. lappacea, but this figure bears little similarity to the lattice shells of the colony (fig. 11), and it is clear from the description of X. lappacea (Haeckel, 1887, p. 120) that the colony Haeckel (1887) illustrated in fig. 11 is C. lamellosa and has been mislabelled as X. lappacea. This mistake has had unfortunate repercussions because Hilmers (1906), Popofsky (1917) and Strelkov & Reshetnjak (1969 and 1971) have incorrectly identified as X. lappacea specimens of C. lamellosa. Acrosphaera transformata can be distinguished from Acrosphaera spinosa spinosa by its smaller size and its delicately porous lattice protuberances. The spine reticulation of A. transformata is not sufficiently developed on specimens that we have observed to constitute a secondary lattice shell, which is the diagnostic character of Xanthiosphaera. Because we have not observed lattice shells of this species in the plankton, this skeletal configuration may be only a preservation effect, but we conclude that the lattice spines of A. transformata indicate a Xanthiosphaera ancestry with A. spinosa as an earlier precursor. A. transformata is of the proper size and morphology to have given rise to Collosphaera orthoconus, and we propose this species as an intermediate morph in the Collosphaera invaginata lineage. Haeckel (1887) did not describe Conosphaera platyconus as a collosphaerid, but its lattice shell clearly has collosphaerid affinities. The lattice pores of C. platyconus are too large and too uniform in size to permit confident assignment of this name as the senior synonym of A. transformata.
Occurrence. -At Site 77, Acrosphaera transformata occurs only in Hole 77A, core 1 and Hole 77B, core 1 (0-18 m below the sea floor; late Pleistocene). Hypotype.- USNM 258882; DSDP Hole 77A, core 1, section 1, 16-18 cm (Tholospyris devexa devexa Zone); England Finder B41/3; P1. 1, figs. 4, 5. (Bjørklund and Goll 1979)
Geological Range:
Last occurrence (top): Extant. Data source: Suzuki catalog
First occurrence (base): within Holocene Epoch (0.00-0.01Ma, base in "Holocene" stage). Data source: Suzuki catalog
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 Hilmers, C (1906). Zur Kenntnis der Collosphaeriden. Inaugural-Dissertation zur Erlandung der Dorkorwurde der hohen philosophischen Fakultat der Koniglichen Christian-Albrecht-Universitat in Kiel. 1-93. gs OReferences:
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Acrosphaera transformata compiled by the radiolaria@mikrotax project team viewed: 15-5-2025
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