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1970 Cyclampterium? pegetrum - Sanfilippo and Riedel Plate 2, figures 8-10
1990 Lophocyrtis ( Cyclampterium ) pegetrum - Sanfilippo Plate 2, figures 3-5
From Suzuki Paleotax db:
1970 Cyclampterium (?) pegetrum n. sp. Sanfilippo & Riedel p. 456, pl. 2, figs. 8-10
1971 Cyclampterium (?) pegetrum Sanfilippo et Riedel Kling p. 1088, pl. 5, fig. 9
1971 Cyclampterium (?) pegetrum Sanfilippo et Riedel Riedel & Sanfilippo p. 1593, pl. 2d, figs. 13, 14, pl. 3b, figs. 1, 2
1972 Cyclampterium (?) pegetrum Sanfilippo et Riedel Goll p. 959, pl. 24, figs. 1-4, pl. 25, figs. 1-3
1972 Cyclampterium pegetrum Riedel et Sanfilippo Petrushevskaya & Kozlova p. 548, pl. 34, figs. 7, 8
1972 Cyclampterium pegetrum Sanfilippo et Riedel Johnson & Parker pl. 2, fig. 8
1973 Cyclampterium (?) pegetrum Sanfilippo et Riedel Foreman p. 435
1973 Cyclampterium (?) pegetrum Sanfilippo et Riedel Sanfilippo et al. p. 220, pl. 4, figs. 15-17
1974 Cyclampterium pegetrum Sanfilippo et Riedel Nigrini p. 1067, pl. 2C, figs. 7, 8
1975 Cyclampterium pegetrum Sanfilippo et Riedel Holdsworth p. 529-530
1977 Cyclampterium pegetrum (Sanfilippo & Riedel) Riedel & Sanfilippo pl. 12, fig. 5
1978 Cyclampterium pegetrum Sanfilippo et Riedel Riedel & Sanfilippo p. 68, pl. 4, fig. 16
1978 Cyclampterium pegetrum Sanfilippo et Riedel Theyer et al. pl. 2, fig. 16
1984 Cyclampterium (?) pegetrum Sanfilippo et Riedel Nigrini & Lombari N99-N100, pl. 22, figs. 4a-4c
1986 Cyclampterium (?) pegetrum Sanfilippo et Riedel Levyikina p. 84-85, pl. 3, figs. 7-10
1986 Cyclampterium pegetrum Sanfilippo et Riedel Riedel & Sanfilippo pl. 1, fig. 4
1990 Lophocyrtis (Cyclampterium) pegetrum Sanfilippo & Riedel Sanfilippo p. 307, pl. 2, figs. 3-5
Catalog entries: Cyclampterium pegetrum
type material: C. pegetrumOriginal description: Shell robust, campanulate to subcylindrical, with the abdomen usually constituting a half or more of the volume of the shell. Cephalis subspherical, poreless or with rather few small pores, in many specimens bearing a short, often thick, apical spine. Collar stricture pronounced. Thorax hemispherical. thick-walled, with sub-regular circular pores. and a surface which is smooth, thorny or nodose. Abdomen usually sub-cylindrical or slightly expanding distally, rarely inverted-hemispherical, with irregular robust meshwork much coarser than that of the thorax, in some specimens closed distally. Some specimens have three, or rarely more, irregular. subcylindrical feet which may be terminal or subterminal, and which arise, not at the lumbar stricture, but more distally.
Remarks on original description: Some early representatives of Cyclampterium ? have the abdomen (with meshes smaller than in early specimens of C. ? pegetrum) drawn out distally as three latticed feet. We have found only a few such specimens, and illustrate one as Cyclampterium ? sp. (plate 2, figure 7).
Sanfilippo 1990 - Cyclampterium pegetrum (Plate II, 3-5 ) Remarks: Lophocyrtis ( Cyclampterium ) pegetrumis distinguished from its ancestor L. (C.) milowi by the median thoracic length being greater than 90 ttm and, when feet are present, by these being solid rather than latticed. From its descendant L. (C.) leptetrumit differs by its shorter (90-125/~m vs. 150-165 ~m) thorax and coarser abdominal meshes. L. (C.) pegetrum differs from mid latitude morphotypes of L.(Paralampterium) dumitricai by its larger thorax and from L.(P.) ? galenum by having a longer abdomen without a differentiated termination and by not having the feet ridged and pored. New observations (on 30 specimens from DSDP Site 73 Cores 13, 14; Site 77B Core 34; Site 289 Cores 64, 69, 71, 75; Site 315A Core 9; Site 366 Core 5 and Site 515B Cores 25, 30, 36): total length 215-620 µm; length of thorax 75-155 µm, width 125-215 µm, number of pores around the circumference 20-30; length of abdomen 85-340 µm, width 160-300 µm, number of pores around the circumference 6-15. No horn; some specimens have a thickened cap over the cephalis. L. (C.) pegetrum is rare to moderately abundant from its evolutionary transition from L. (C.) milowi in the early Dorcadospyris ateuchus Zone to the middle of the Cyrtocapsella tetrapera Zone, where it evolves into L. ( C. ) leptetrum (latest Oligocene to Early Miocene).
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:
Sanfilippo, A. & Riedel, W. R. (1970). Post-Eocene "closed" theoperid radiolarians. Micropaleontology. 16(4): 446-462. gs Sanfilippo, A. (1990). Origin of the subgenera Cyclampterium, Parampterium and Sciadiopeplus from Lophocyrtis (Lophocyrtis) (Radiolaria, Theoperidae). Marine Micropaleontology. 15(3-4): 287-312. gsReferences:
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Lophocyrtis pegetrum compiled by the radiolaria@mikrotax project team viewed: 13-1-2025
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